7Baggers

MPLX LP
(NYSE:MPLX) 

MPLX stock logo

MPLX LP owns and operates midstream energy infrastructure and logistics assets primarily in the United States. It operates in two segments, Logistics and Storage, and Gathering and Processing. The company is involved in the gathering, processing, and transportation of natural gas; gathering, transpo...

Founded: 2012
Sector: Energy
Industry: Oil & Gas Midstream

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At a glance:
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Quarterly
Annual
    Unit: USD2026-03-31 2025-12-31 2025-09-30 2025-06-30 2025-03-31 2024-12-31 2024-09-30 2024-06-30 2024-03-31 2023-12-31 2023-09-30 2023-06-30 2023-03-31 2022-12-31 2022-09-30 2022-06-30 2022-03-31 2021-12-31 2021-09-30 2021-06-30 2021-03-31 2020-12-31 2020-09-30 2020-06-30 2020-03-31 2019-12-31 2019-09-30 2019-06-30 2019-03-31 2018-12-31 2018-09-30 2018-06-30 2018-03-31 2017-12-31 2017-09-30 2017-06-30 2017-03-31 2016-12-31 2016-09-30 2016-06-30 2016-03-31 2015-12-31 2015-09-30 2015-06-30 2015-03-31 2014-12-31 2014-09-30 2014-06-30 2014-03-31 2013-12-31 2013-09-30 2013-06-30 2013-03-31 2012-12-31 2012-09-30 
                                                           
      revenues and other income:
                                                           
      service revenue
    711,000,000 746,000,000 750,000,000 696,000,000 707,000,000 720,000,000 709,000,000 683,000,000 658,000,000 658,000,000 641,000,000 635,000,000 605,000,000 601,000,000 627,000,000 577,000,000 554,000,000 546,000,000 600,000,000 578,000,000 589,000,000 618,000,000 604,000,000 563,000,000 612,000,000 633,000,000 632,000,000 448,000,000 438,000,000 456,000,000 456,000,000 410,000,000 382,000,000 311,000,000 299,000,000 286,000,000 260,000,000 246,000,000 250,000,000 233,000,000 229,000,000               
      service revenue - related parties
    1,090,000,000 1,140,000,000 1,094,000,000 1,093,000,000 1,066,000,000 1,078,000,000 1,066,000,000 1,050,000,000 986,000,000 1,023,000,000 1,038,000,000 971,000,000 953,000,000 953,000,000 948,000,000 938,000,000 915,000,000 947,000,000 902,000,000 907,000,000 872,000,000 886,000,000 909,000,000 857,000,000 928,000,000 906,000,000 899,000,000 620,000,000 578,000,000 571,000,000 568,000,000 549,000,000 471,000,000 281,000,000 276,000,000 270,000,000 255,000,000 155,000,000 153,000,000 145,000,000 150,000,000               
      service revenue - product related
    4,000,000 56,000,000 64,000,000 70,000,000 99,000,000 92,000,000 86,000,000 84,000,000 95,000,000 80,000,000 75,000,000 60,000,000 79,000,000 70,000,000 83,000,000 118,000,000 123,000,000 110,000,000 82,000,000 76,000,000 77,000,000 53,000,000 41,000,000 22,000,000 39,000,000 54,000,000 26,000,000 26,000,000 34,000,000 44,000,000 59,000,000 51,000,000 44,000,000                       
      rental income
    65,000,000 64,000,000 68,000,000 64,000,000 64,000,000 64,000,000 63,000,000 64,000,000 60,000,000 62,000,000 61,000,000 59,000,000 61,000,000 59,000,000 75,000,000 102,000,000 91,000,000 90,000,000 88,000,000 99,000,000 99,000,000 102,000,000 102,000,000 98,000,000 96,000,000 97,000,000 99,000,000 90,000,000 94,000,000 97,000,000 89,000,000 84,000,000 79,000,000 69,000,000 69,000,000 70,000,000 69,000,000 80,000,000 77,000,000 71,000,000 70,000,000               
      rental income - related parties
    242,000,000 234,000,000 228,000,000 216,000,000 211,000,000 209,000,000 216,000,000 211,000,000 217,000,000 210,000,000 207,000,000 203,000,000 202,000,000 199,000,000 201,000,000 198,000,000 165,000,000 169,000,000 164,000,000 168,000,000 242,000,000 240,000,000 241,000,000 237,000,000 234,000,000 292,000,000 293,000,000 158,000,000 193,000,000 193,000,000 190,000,000 190,000,000 145,000,000 72,000,000 70,000,000 70,000,000 67,000,000 30,000,000 29,000,000 29,000,000 26,000,000               
      product sales
    476,000,000 492,000,000 525,000,000 472,000,000 513,000,000 466,000,000 433,000,000 388,000,000 370,000,000 391,000,000 478,000,000 376,000,000 420,000,000 407,000,000 617,000,000 698,000,000 497,000,000 556,000,000 448,000,000 304,000,000 282,000,000 182,000,000 165,000,000 120,000,000 169,000,000 230,000,000 171,000,000 168,000,000 202,000,000 250,000,000 239,000,000 206,000,000 207,000,000 278,000,000 217,000,000 191,000,000 203,000,000 178,000,000 157,000,000 137,000,000 100,000,000               
      product sales - related parties
    68,000,000 17,000,000 26,000,000 25,000,000 75,000,000 61,000,000 51,000,000 50,000,000 63,000,000 95,000,000 51,000,000 34,000,000 70,000,000 56,000,000 46,000,000 51,000,000 45,000,000 46,000,000 26,000,000 31,000,000 42,000,000 28,000,000 37,000,000 30,000,000 33,000,000 33,000,000 32,000,000 14,000,000 11,000,000 14,000,000 18,000,000 13,000,000 4,000,000 2,000,000 2,000,000 2,000,000 2,000,000 3,000,000 2,000,000 3,000,000 3,000,000               
      sales-type lease revenue
    48,000,000 41,000,000 37,000,000 36,000,000 37,000,000 34,000,000 34,000,000 34,000,000 34,000,000 35,000,000 34,000,000 33,000,000 34,000,000 34,000,000 28,000,000                                         
      sales-type lease revenue - related parties
    102,000,000 104,000,000 113,000,000 116,000,000 115,000,000 116,000,000 118,000,000 120,000,000 121,000,000 121,000,000 129,000,000 125,000,000 125,000,000 122,000,000 118,000,000 114,000,000 111,000,000 130,000,000 132,000,000 136,000,000                                    
      income from equity method investments
    182,000,000 155,000,000 186,000,000 170,000,000 186,000,000 171,000,000 149,000,000 325,000,000 157,000,000 162,000,000 159,000,000 145,000,000 134,000,000 141,000,000 125,000,000 111,000,000 99,000,000 93,000,000 92,000,000 66,000,000 70,000,000   89,000,000  35,000,000 95,000,000 73,000,000 70,000,000 43,750,000 64,000,000 50,000,000 61,000,000 49,000,000 23,000,000 1,000,000 5,000,000 -2,000,000 6,000,000  5,000,000               
      other income
    7,000,000 160,000,000 4,000,000 5,000,000 10,000,000 12,000,000 7,000,000 6,000,000 45,000,000 98,000,000 7,000,000 18,000,000 3,000,000 -9,000,000 505,000,000 6,000,000 -17,000,000 19,000,000 -2,000,000 3,000,000 1,000,000  2,000,000 2,000,000 1,000,000 6,000,000 2,000,000 5,000,000  -1,000,000 3,000,000 1,000,000 4,000,000 1,000,000 2,000,000 1,000,000 2,000,000 1,000,000 2,000,000 1,000,000 2,000,000 3,800,000 1,400,000 1,400,000 1,400,000 1,100,000 1,500,000 1,100,000 1,500,000 1,300,000 1,000,000 900,000 1,200,000 1,900,000 1,700,000 
      other income - related parties
    43,000,000 43,000,000 40,000,000 40,000,000 41,000,000 40,000,000 40,000,000 37,000,000 40,000,000 31,000,000 32,000,000 31,000,000 27,000,000 29,000,000 28,000,000 27,000,000 27,000,000 28,000,000 27,000,000 27,000,000 65,000,000 64,000,000 63,000,000 63,000,000 64,000,000 30,000,000 31,000,000 27,000,000 26,000,000 26,000,000 26,000,000 24,000,000 23,000,000 23,000,000 22,000,000 25,000,000 22,000,000 23,000,000 26,000,000 28,000,000 24,000,000 8,200,000 6,300,000 6,400,000 6,100,000 6,100,000 5,800,000 6,000,000 5,100,000 5,400,000 4,600,000 5,200,000 3,600,000 3,500,000 3,200,000 
      total revenues and other income
    3,038,000,000 3,252,000,000 3,619,000,000 3,003,000,000 3,124,000,000 3,063,000,000 2,972,000,000 3,052,000,000 2,846,000,000 2,966,000,000 2,912,000,000 2,690,000,000 2,713,000,000 2,662,000,000 3,401,000,000 2,940,000,000 2,610,000,000 2,734,000,000 2,559,000,000 2,395,000,000 2,339,000,000 2,249,000,000 2,247,000,000 2,081,000,000 992,000,000 2,316,000,000 2,280,000,000 1,629,000,000 1,646,000,000 1,715,000,000 1,712,000,000 1,578,000,000 1,420,000,000 1,085,000,000 980,000,000 916,000,000 886,000,000 714,000,000 703,000,000 564,000,000 609,000,000 269,300,000 148,600,000 147,600,000 137,500,000 139,100,000 138,000,000 133,900,000 137,300,000 125,600,000 123,800,000 122,200,000 114,700,000 128,300,000 121,100,000 
      costs and expenses:
                                                           
      cost of revenues
    402,000,000 408,000,000 395,000,000 369,000,000 389,000,000 401,000,000 404,000,000 384,000,000 371,000,000 378,000,000 367,000,000 348,000,000 308,000,000 388,000,000 371,000,000 323,000,000 287,000,000 320,000,000 298,000,000 293,000,000 273,000,000 320,000,000 323,000,000 315,000,000 368,000,000 390,000,000 407,000,000 233,000,000 210,000,000 268,000,000 241,000,000 233,000,000 206,000,000 147,000,000 129,000,000 139,000,000 113,000,000 91,000,000 90,000,000 84,000,000 89,000,000 70,600,000 41,900,000 31,700,000 27,800,000 42,400,000 40,600,000 35,700,000 26,600,000 36,700,000 33,100,000 35,600,000 30,500,000 37,800,000 53,500,000 
      purchased product costs
    498,000,000 431,000,000 493,000,000 432,000,000 459,000,000 413,000,000 403,000,000 376,000,000 369,000,000 364,000,000 474,000,000 354,000,000 406,000,000 393,000,000 540,000,000 663,000,000 467,000,000 550,000,000 421,000,000 338,000,000 276,000,000 165,000,000 152,000,000 87,000,000 135,000,000 197,000,000 129,000,000 166,000,000 194,000,000 213,000,000 241,000,000 204,000,000 187,000,000 210,000,000 170,000,000 140,000,000 131,000,000 138,000,000 117,000,000 114,000,000 79,000,000               
      rental cost of sales
    18,000,000 19,000,000 22,000,000 20,000,000 19,000,000 21,000,000 22,000,000 20,000,000 19,000,000 22,000,000 20,000,000 20,000,000 20,000,000 22,000,000 22,000,000 42,000,000 37,000,000 39,000,000 33,000,000 32,000,000 32,000,000 34,000,000 33,000,000 33,000,000 35,000,000 38,000,000 37,000,000 28,000,000 37,000,000 41,000,000 32,000,000 33,000,000 29,000,000 18,000,000 19,000,000 13,000,000 12,000,000 14,000,000 11,000,000 14,000,000 14,000,000               
      rental cost of sales - related parties
    4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 5,000,000 5,000,000 4,000,000 9,000,000 8,000,000 9,000,000 7,000,000 10,000,000 10,000,000 19,000,000 15,000,000 23,000,000 24,000,000 23,000,000 39,000,000 41,000,000 32,000,000 41,000,000 46,000,000 41,000,000 45,000,000 2,000,000 3,000,000 3,000,000 1,000,000  1,000,000 1,000,000  1,000,000                    
      purchases - related parties
    394,000,000 415,000,000 396,000,000 422,000,000 416,000,000 421,000,000 402,000,000 388,000,000 372,000,000 384,000,000 442,000,000 357,000,000 361,000,000 379,000,000 364,000,000 351,000,000 319,000,000 317,000,000 307,000,000 297,000,000 298,000,000 263,000,000 297,000,000 280,000,000 276,000,000 337,000,000 303,000,000 239,000,000 212,000,000 232,000,000 228,000,000 223,000,000 177,000,000 125,000,000 114,000,000 109,000,000 107,000,000 78,000,000 84,000,000 78,000,000 76,000,000               
      depreciation and amortization
    358,000,000 355,000,000 346,000,000 324,000,000 326,000,000 324,000,000 322,000,000 320,000,000 317,000,000 306,000,000 301,000,000 310,000,000 296,000,000 305,000,000 302,000,000 310,000,000 313,000,000 316,000,000 324,000,000 318,000,000 329,000,000 385,000,000 346,000,000 321,000,000 325,000,000 338,000,000 302,000,000 214,000,000 211,000,000 201,000,000 201,000,000 188,000,000 176,000,000 168,000,000 164,000,000 164,000,000 187,000,000 139,000,000 138,000,000 137,000,000 132,000,000               
      general and administrative expenses
    114,000,000 101,000,000 126,000,000 107,000,000 112,000,000 104,000,000 107,000,000 107,000,000 109,000,000 99,000,000 102,000,000 89,000,000 89,000,000 87,000,000 88,000,000 82,000,000 78,000,000 86,000,000 94,000,000 87,000,000 86,000,000 89,000,000 96,000,000 96,000,000 97,000,000 95,000,000 102,000,000 69,000,000 82,000,000 74,000,000 76,000,000 72,000,000 69,000,000 67,000,000 59,000,000 57,000,000 58,000,000 46,000,000 46,000,000 49,000,000 52,000,000 46,300,000 21,100,000 17,900,000 18,700,000 17,700,000 15,300,000 15,900,000 15,900,000 13,300,000 13,000,000 13,900,000 13,500,000 11,700,000 11,200,000 
      other taxes
    36,000,000 36,000,000 36,000,000 32,000,000 33,000,000 32,000,000 32,000,000 33,000,000 34,000,000 29,000,000 44,000,000 28,000,000 30,000,000 18,000,000 30,000,000 33,000,000 34,000,000 27,000,000 27,000,000 34,000,000 32,000,000 31,000,000 33,000,000 30,000,000 31,000,000 29,000,000 29,000,000 19,000,000 19,000,000 17,000,000 20,000,000 17,000,000 18,000,000 14,000,000 14,000,000 13,000,000 13,000,000 11,000,000 10,000,000 11,000,000 11,000,000 4,500,000 -700,000 3,000,000 3,200,000 1,700,000 1,700,000 1,900,000 1,900,000 1,300,000 1,400,000 1,800,000 1,700,000 1,600,000 3,000,000 
      total costs and expenses
    1,824,000,000 1,769,000,000 1,818,000,000 1,710,000,000 1,758,000,000 1,720,000,000 1,697,000,000 1,633,000,000 1,595,000,000 1,591,000,000 1,758,000,000 1,515,000,000 1,517,000,000 1,602,000,000 1,727,000,000 1,823,000,000 1,550,000,000 1,678,000,000 1,528,000,000 1,464,000,000 1,365,000,000 1,329,000,000 1,348,000,000 1,203,000,000 3,478,000,000 2,662,000,000 1,354,000,000 970,000,000 968,000,000 1,049,000,000 1,040,000,000 970,000,000 863,000,000 750,000,000 669,000,000 636,000,000 621,000,000 517,000,000 496,000,000 488,000,000 582,000,000 219,200,000 101,500,000 90,000,000 86,300,000 100,600,000 93,800,000 89,600,000 81,000,000 89,100,000 84,000,000 87,000,000 79,200,000 85,800,000 84,800,000 
      income from operations
    1,214,000,000 1,483,000,000 1,801,000,000 1,293,000,000 1,366,000,000 1,343,000,000 1,275,000,000 1,419,000,000 1,251,000,000 1,375,000,000 1,154,000,000 1,175,000,000 1,196,000,000 1,060,000,000 1,674,000,000 1,117,000,000 1,060,000,000 1,056,000,000 1,031,000,000 931,000,000 974,000,000   878,000,000  -346,000,000 926,000,000 659,000,000 678,000,000 666,000,000 672,000,000 608,000,000 557,000,000 335,000,000 311,000,000 280,000,000 265,000,000 197,000,000 207,000,000 76,000,000 27,000,000 50,100,000 47,100,000 57,600,000 51,200,000 38,500,000 44,200,000 44,300,000 56,300,000 36,500,000 39,800,000 35,200,000 35,500,000 42,500,000 36,300,000 
      yoy
    -11.13% 10.42% 41.25% -8.88% 9.19% -2.33% 10.49% 20.77% 4.60% 29.72% -31.06% 5.19% 12.83% 0.38% 62.37% 19.98% 8.83%   6.04%    33.23%  -151.95% 37.80% 8.39% 21.72% 98.81% 116.08% 117.14% 110.19% 70.05% 50.24% 268.42% 881.48% 293.21% 339.49% 31.94% -47.27% 30.13% 6.56% 30.02% -9.06% 5.48% 11.06% 25.85% 58.59% -14.12% 9.64%     
      qoq
    -18.14% -17.66% 39.29% -5.34% 1.71% 5.33% -10.15% 13.43% -9.02% 19.15% -1.79% -1.76% 12.83% -36.68% 49.87% 5.38% 0.38% 2.42% 10.74% -4.41%      -137.37% 40.52% -2.80% 1.80% -0.89% 10.53% 9.16% 66.27% 7.72% 11.07% 5.66% 34.52% -4.83% 172.37% 181.48% -46.11% 6.37% -18.23% 12.50% 32.99% -12.90% -0.23% -21.31% 54.25% -8.29% 13.07% -0.85% -16.47% 17.08%  
      net interest and other financial costs
    291,000,000 277,000,000 243,000,000 234,000,000 229,000,000 229,000,000 226,000,000 231,000,000 235,000,000                                 4,175,000 5,200,000 6,200,000 5,300,000 2,300,000 1,100,000 1,300,000 600,000       
      income before income taxes
    923,000,000 1,206,000,000 1,558,000,000 1,059,000,000 1,137,000,000 1,114,000,000 1,049,000,000 1,188,000,000 1,016,000,000 1,153,000,000 929,000,000 942,000,000 953,000,000 826,000,000 1,438,000,000 884,000,000 838,000,000 838,000,000 811,000,000 715,000,000 749,000,000   655,000,000  -575,000,000 693,000,000 489,000,000 507,000,000 439,000,000 519,000,000 457,000,000 427,000,000 239,000,000 218,000,000 193,000,000 187,000,000 132,000,000 143,000,000 12,000,000 -41,000,000 19,800,000 41,900,000 51,400,000 45,900,000 36,200,000 43,100,000 43,000,000 55,700,000 36,100,000 39,600,000 34,900,000 35,300,000 42,300,000 36,800,000 
      provision for income taxes
    1,000,000 3,000,000 3,000,000 1,000,000 1,000,000 5,000,000 2,000,000 2,000,000 1,000,000 9,000,000 1,000,000  1,000,000 2,000,000 1,000,000  5,000,000    1,000,000         2,000,000 3,000,000 1,000,000 4,000,000 -2,000,000 1,000,000 2,000,000          -200,000    -700,000 400,000     
      net income
    922,000,000 1,203,000,000 1,555,000,000 1,058,000,000 1,136,000,000 1,109,000,000 1,047,000,000 1,186,000,000 1,015,000,000 1,144,000,000 928,000,000 942,000,000 952,000,000 824,000,000 1,437,000,000 884,000,000 833,000,000 838,000,000 811,000,000 715,000,000 748,000,000   655,000,000  -573,000,000 689,000,000 488,000,000 509,000,000 439,000,000 516,000,000 456,000,000 423,000,000 241,000,000 217,000,000 191,000,000 187,000,000 132,000,000 143,000,000 20,000,000 -37,000,000 17,900,000 41,800,000 51,400,000 45,900,000 36,400,000 43,100,000 42,900,000 55,700,000 36,800,000 39,200,000 34,800,000 35,300,000 42,100,000 36,900,000 
      yoy
    -18.84% 8.48% 48.52% -10.79% 11.92% -3.06% 12.82% 25.90% 6.62% 38.83% -35.42% 6.56% 14.29% -1.67% 77.19% 23.64% 11.36%   9.16%    34.22%  -230.52% 33.53% 7.02% 20.33% 82.16% 137.79% 138.74% 126.20% 82.58% 51.75% 855.00% -605.41% 637.43% 242.11% -61.09% -180.61% -50.82% -3.02% 19.81% -17.59% -1.09% 9.95% 23.28% 57.79% -12.59% 6.23%     
      qoq
    -23.36% -22.64% 46.98% -6.87% 2.43% 5.92% -11.72% 16.85% -11.28% 23.28% -1.49% -1.05% 15.53% -42.66% 62.56% 6.12% -0.60% 3.33% 13.43% -4.41%      -183.16% 41.19% -4.13% 15.95% -14.92% 13.16% 7.80% 75.52% 11.06% 13.61% 2.14% 41.67% -7.69% 615.00% -154.05% -306.70% -57.18% -18.68% 11.98% 26.10% -15.55% 0.47% -22.98% 51.36% -6.12% 12.64% -1.42% -16.15% 14.09%  
      less: net income attributable to noncontrolling interests
    10,000,000 10,000,000 10,000,000 10,000,000 10,000,000 10,000,000 10,000,000 10,000,000 10,000,000 10,000,000 10,000,000 9,000,000 9,000,000 8,000,000 9,000,000 9,000,000 8,000,000 8,000,000 9,000,000 9,000,000 9,000,000 9,000,000 9,000,000 7,000,000 8,000,000 8,000,000 8,000,000 6,000,000 6,000,000 5,000,000 6,000,000 3,000,000 2,000,000 3,000,000 1,000,000 1,000,000 1,000,000 -1,000,000 2,000,000 1,000,000                
      net income attributable to mplx lp
    912,000,000 1,193,000,000 1,545,000,000 1,048,000,000 1,126,000,000 1,099,000,000 1,037,000,000 1,176,000,000 1,005,000,000 1,134,000,000 918,000,000 933,000,000 943,000,000 816,000,000 1,428,000,000 875,000,000 825,000,000 830,000,000 802,000,000 706,000,000 739,000,000   648,000,000  -581,000,000 629,000,000 482,000,000 503,000,000 434,000,000 510,000,000 453,000,000 421,000,000 238,000,000 216,000,000 190,000,000 150,000,000 133,000,000 141,000,000 19,000,000 -60,000,000 17,700,000 41,500,000 51,200,000 45,600,000 29,200,000 29,100,000 28,800,000 34,200,000 20,200,000 21,500,000 18,600,000 17,600,000   
      per unit data
                                                           
      net income attributable to mplx lp per limited partner unit:
                                                           
      common - basic
    900,000 1,170,000 1,520,000 1,030,000 1,100,000 1,070,000 1,010,000 1,150,000 980,000 1,100,000 890,000 910,000 910,000 780,000 1,360,000 830,000 780,000 790,000 740,000 660,000 680,000 630,000 610,000 580,000 -2,600,000 -780,000 610,000 560,000 610,000 520,000 620,000 550,000 610,000 320,000 290,000 260,000 200,000 -47,500 220,000 -110,000 -330,000 -190,000 410,000 500,000 460,000 390,000 370,000 370,000 410,000 260,000 290,000 260,000    
      common - diluted
    900,000 1,170,000 1,520,000 1,030,000 1,100,000 1,070,000 1,010,000 1,150,000 980,000 1,100,000 890,000 910,000 910,000 780,000 1,360,000 830,000 780,000 790,000 740,000 660,000 680,000 630,000 610,000 580,000 -2,600,000 -780,000 610,000 550,000 610,000 520,000 620,000 550,000 610,000 310,000 290,000 260,000 190,000 -47,500 210,000 -110,000 -330,000 -200,000 410,000 500,000 460,000 390,000 370,000 370,000 410,000 260,000 290,000 260,000    
      weighted-average limited partner units outstanding:
                                                           
      gain on equity method investments
      484,000,000                                                     
      less: series a preferred unitholders’ interest in net income
         6,000,000 6,000,000 5,000,000 10,000,000                                               
      limited partners' interest in net income attributable to mplx lp
     929,750,000 1,545,000,000 1,048,000,000 1,126,000,000 799,250,000 1,031,000,000 1,171,000,000 995,000,000 679,500,000 893,000,000 910,000,000 915,000,000 758,000,000 1,395,000,000                                         
      less: series b preferred unitholders’ interest in net income
                                                           
      related-party interest and other financial costs
                                                           
      interest expense, net of amounts capitalized
             224,000,000 223,000,000 226,000,000 224,000,000 216,000,000 217,000,000                                         
      other financial costs
             -2,000,000 2,000,000 7,000,000 19,000,000 18,000,000 19,000,000 20,000,000 20,000,000 19,000,000 21,000,000 19,000,000 27,000,000 13,000,000 17,000,000 16,000,000 16,000,000 15,000,000 16,000,000 13,000,000 14,000,000 73,000,000 17,000,000 15,000,000 17,000,000 16,000,000 15,000,000 13,000,000 12,000,000 13,000,000 13,000,000 12,000,000 12,000,000               
      less: series a preferred unitholders interest in net income
             17,750,000 25,000,000 23,000,000 23,000,000 16,250,000 23,000,000 21,000,000 21,000,000 19,750,000 38,000,000                                     
      less: series b preferred unitholders interest in net income
             1,250,000   5,000,000 7,750,000 10,000,000 10,000,000 11,000,000 7,750,000 10,000,000                                     
      impairment expense
                       42,000,000     2,165,000,000               1,000,000 129,000,000               
      related party interest and other financial costs
                   1,000,000 4,000,000 4,000,000 2,000,000 2,000,000  1,000,000  1,000,000 3,000,000 3,000,000 5,000,000 1,000,000 1,000,000 1,000,000 2,000,000 1,000,000 1,000,000 1,000,000 1,000,000      1,000,000               
      interest expense
                   212,000,000 198,000,000 195,000,000 197,000,000 195,000,000 198,000,000 205,000,000 207,000,000 206,000,000 211,000,000 211,000,000 212,000,000 156,000,000 156,000,000 153,000,000 134,000,000 135,000,000 112,000,000 79,000,000 77,000,000 74,000,000 66,000,000 52,000,000 51,000,000 52,000,000 55,000,000               
      limited partners’ interest in net income attributable to mplx lp
                   844,000,000 793,000,000 799,000,000 754,000,000 675,000,000 708,000,000   617,000,000  -611,000,000 602,000,000 461,000,000 483,000,000 414,000,000 491,000,000 433,000,000 405,000,000 126,000,000 114,000,000 99,000,000 72,000,000 62,000,000 74,000,000 -36,000,000 -99,000,000 -19,900,000 32,900,000 44,400,000 41,600,000 27,000,000 27,600,000 27,600,000 33,200,000 19,700,000 21,000,000 18,300,000 17,200,000   
      restructuring expenses
                         1,000,000 36,000,000                                 
      less: series a preferred unit distributions
                       21,000,000 20,000,000 20,000,000 20,000,000 21,000,000 20,000,000 20,000,000 20,000,000 21,000,000                            
      less: series b preferred unit distributions
                       10,000,000 11,000,000 10,000,000 10,000,000 10,000,000 11,000,000 10,000,000 7,000,000                             
      income/(loss) from equity method investments
                         -253,000,000 83,000,000  -1,184,000,000                               
      income/(loss) from operations
                         -177,250,000 899,000,000  -2,486,000,000                               
      income/(loss) before income taxes
                         -346,500,000 675,000,000  -2,716,000,000                               
      benefit from income taxes
                         250,000 1,000,000   500,000 4,000,000               1,900,000 100,000     100,000    100,000    
      net income/
                         -346,750,000 674,000,000  -2,716,000,000                               
      less: net income attributable to predecessor
                              52,000,000          36,000,000                   
      net income/(loss) attributable to mplx lp
                         -352,750,000 665,000,000  -2,724,000,000                               
      limited partners’ interest in net income/(loss) attributable to mplx lp
                         -375,750,000 635,000,000  -2,755,000,000                               
      net income/(loss) attributable to mplx lp per limited partner unit:
                                                           
      (benefit)/benefit from income taxes
                               1,000,000 -2,000,000                           
      less: preferred unit distributions
                                20,000,000 20,000,000 19,000,000 20,000,000 16,000,000 16,000,000 16,000,000 17,000,000 16,000,000 16,000,000 16,000,000 9,000,000                
      less: general partner’s gp interest in net income attributable to mplx lp
                                                           
      cash distributions declared per limited partner common unit
                                   627,500 617,500 607,500 587,500 562,500 540,000 520,000 515,000 510,000 505,000 500,000 470,000 440,000 410,000 382,500 357,500 342,500 327,500 312,500 297,500 285,000    
      gain on sale of assets
                                     250,000   1,000,000  1,000,000                 
      less: general partner’s interest in net income attributable to mplx lp
                                     96,000,000 86,000,000 74,000,000 62,000,000 55,000,000 51,000,000 46,000,000 39,000,000 37,600,000 8,600,000 6,800,000 4,000,000 925,000 1,500,000 1,200,000 1,000,000 300,000 500,000 300,000 400,000   
      benefit for income taxes
                                         -3,000,000  -8,000,000 -4,000,000             25,000 -100,000 
      subordinated - basic and diluted
                                             -1,250,000  500,000 460,000 340,000 370,000 370,000 410,000 270,000 290,000 230,000    
      loss from equity method investments
                                           -83,000,000                
      less: net income attributable to noncontrolling interests and predecessor
                                            23,000,000               
      sales and other operating revenues
                                             12,550,000 18,200,000 16,400,000 15,600,000 17,000,000 16,600,000 18,700,000 16,900,000 18,900,000 20,400,000 18,800,000 20,800,000 20,900,000 19,600,000 
      sales to related parties
                                             90,175,000 122,700,000 123,600,000 114,400,000 114,900,000 114,100,000 108,100,000 113,800,000 100,000,000 97,800,000 97,300,000 89,100,000 102,000,000 96,600,000 
      loss on sale of assets
                                             -50,000  -200,000            
      purchases from related parties
                                             26,900,000 26,500,000 24,700,000 23,900,000 26,100,000 23,700,000 23,700,000 24,000,000 25,200,000 23,800,000 23,800,000 21,800,000 23,100,000 7,700,000 
      depreciation
                                             9,525,000 12,700,000 12,700,000 12,700,000 12,700,000 12,500,000 12,400,000 12,600,000 12,600,000 12,700,000 11,900,000 11,700,000 11,600,000 9,400,000 
      less: net income attributable to mpc-retained interest
                                             200,000 300,000 200,000 300,000 7,200,000 14,000,000 14,100,000 21,500,000 16,600,000 17,700,000 16,200,000 17,700,000   
      weighted-average limited partner units outstanding
                                                           
      common units - public
                                                   19,900,000 19,900,000  19,900,000 19,900,000 19,900,000   
      common units - mpc
                                                   17,100,000 17,100,000  17,100,000 17,100,000 17,100,000   
      subordinated units - mpc
                                                   37,000,000 37,000,000  37,000,000 37,000,000 37,000,000   
      related party interest and other financial income
                                                          500,000 
      interest and other financial income
                                                     -175,000 -200,000 -300,000 -200,000   
      net income attributable to mplx lp per limited partner unit
                                                           
      common
                                                        260,000   
      subordinated
                                                        210,000   
      cash distribution declared per limited partner common unit
                                                        272,500   
    Balance Sheets:
    Quarterly
    Annual
      Unit: USD2026-03-31 2025-12-31 2025-09-30 2025-06-30 2025-03-31 2024-12-31 2024-09-30 2024-06-30 2024-03-31 2023-12-31 2023-09-30 2023-06-30 2023-03-31 2022-12-31 2022-09-30 2022-06-30 2022-03-31 2021-12-31 2021-09-30 2021-06-30 2021-03-31 2020-12-31 2020-09-30 2020-06-30 2020-03-31 2019-12-31 2019-09-30 2019-06-30 2019-03-31 2018-12-31 2018-09-30 2018-06-30 2018-03-31 2017-12-31 2017-09-30 2017-06-30 2017-03-31 2016-12-31 2016-09-30 2016-06-30 2016-03-31 2015-12-31 2015-09-30 2015-06-30 2015-03-31 2014-12-31 2014-09-30 2014-06-30 2014-03-31 2013-12-31 2013-09-30 2013-06-30 2013-03-31 2012-12-31 2012-09-30 
                                                             
        assets
                                                             
        cash and cash equivalents
      1,506,000,000 2,137,000,000 1,765,000,000 1,386,000,000 2,534,000,000 1,519,000,000 2,426,000,000 2,501,000,000 385,000,000 1,048,000,000 960,000,000 755,000,000 393,000,000 238,000,000 121,000,000 298,000,000 42,000,000 13,000,000 39,000,000 8,000,000 24,000,000 15,000,000 28,000,000 67,000,000 57,000,000 15,000,000 41,000,000 7,000,000 93,000,000 68,000,000 37,000,000 3,000,000 2,000,000 5,000,000 3,000,000 293,000,000 265,000,000 234,000,000 208,000,000 35,000,000 4,000,000 43,000,000 90,400,000 130,400,000 132,500,000 27,300,000 32,200,000 43,200,000 40,600,000 54,100,000 86,900,000 115,300,000 227,900,000 216,700,000 68,500,000 
        receivables, less allowance for expected credit loss
      769,000,000 735,000,000 729,000,000 736,000,000                                                    
        current assets - related parties
      1,007,000,000 899,000,000 854,000,000 826,000,000 910,000,000 830,000,000 842,000,000 748,000,000 803,000,000 748,000,000 759,000,000 654,000,000 701,000,000 729,000,000 698,000,000 731,000,000 813,000,000 644,000,000 645,000,000 614,000,000 650,000,000 677,000,000 591,000,000 594,000,000 600,000,000 656,000,000 660,000,000 333,000,000 386,000,000                           
        inventories
      178,000,000 172,000,000 175,000,000 192,000,000 186,000,000 180,000,000 171,000,000 168,000,000 163,000,000 159,000,000 154,000,000 146,000,000 141,000,000 148,000,000 151,000,000 157,000,000 149,000,000 142,000,000 141,000,000 126,000,000 128,000,000 118,000,000 117,000,000 115,000,000 105,000,000 110,000,000 104,000,000 77,000,000 74,000,000 77,000,000 81,000,000 73,000,000 64,000,000 65,000,000 64,000,000 62,000,000 62,000,000 54,000,000 50,000,000 49,000,000 45,000,000 49,000,000             10,100,000 
        other current assets
      62,000,000 51,000,000 38,000,000 33,000,000 33,000,000 29,000,000 37,000,000 32,000,000 36,000,000 30,000,000 30,000,000 49,000,000 63,000,000 53,000,000 40,000,000 43,000,000 53,000,000 54,000,000 54,000,000 46,000,000 49,000,000 65,000,000 59,000,000 48,000,000 45,000,000 110,000,000 65,000,000 34,000,000 34,000,000 46,000,000 37,000,000 41,000,000 33,000,000 37,000,000 32,000,000 31,000,000 31,000,000 33,000,000 33,000,000 24,000,000 28,000,000 50,000,000 4,100,000 7,300,000 6,100,000 7,000,000 6,900,000 8,200,000 11,000,000 8,900,000 2,300,000 3,300,000 2,400,000 2,600,000 500,000 
        total current assets
      3,522,000,000 3,994,000,000 4,595,000,000 3,173,000,000 4,521,000,000 3,276,000,000 4,218,000,000 4,196,000,000 2,139,000,000 2,808,000,000 2,736,000,000 2,321,000,000 2,012,000,000 1,905,000,000 1,951,000,000 2,018,000,000 1,798,000,000 1,507,000,000 1,516,000,000 1,332,000,000 1,374,000,000 1,515,000,000 1,272,000,000 1,386,000,000 1,329,000,000 1,484,000,000 1,440,000,000 786,000,000 952,000,000 897,000,000 925,000,000 774,000,000 729,000,000 559,000,000 571,000,000 843,000,000 811,000,000 740,000,000 686,000,000 486,000,000 429,000,000 474,000,000 173,000,000 214,700,000 209,900,000 97,200,000 105,500,000 119,400,000 128,000,000 135,100,000 155,600,000 180,900,000 295,700,000 283,800,000 152,500,000 
        equity method investments
      4,981,000,000 4,798,000,000 4,792,000,000 5,024,000,000 4,751,000,000 4,531,000,000 4,558,000,000 4,373,000,000 4,343,000,000 3,743,000,000 4,099,000,000 4,124,000,000 4,144,000,000 4,095,000,000 4,108,000,000 4,099,000,000 4,079,000,000 3,981,000,000 4,001,000,000 4,033,000,000 4,040,000,000 4,036,000,000 4,081,000,000 4,065,000,000 3,992,000,000 5,275,000,000 5,182,000,000 4,409,000,000 4,270,000,000 4,174,000,000 4,104,000,000 4,042,000,000 4,033,000,000 4,010,000,000 3,997,000,000 3,368,000,000 3,306,000,000 2,467,000,000 2,475,000,000 2,485,000,000 2,598,000,000 2,458,000,000              
        property, plant and equipment
      21,992,000,000 21,698,000,000 21,348,000,000 19,191,000,000 19,147,000,000 19,154,000,000 19,153,000,000 19,186,000,000 19,299,000,000 19,264,000,000 18,620,000,000 18,692,000,000 18,758,000,000 18,848,000,000 18,910,000,000 19,767,000,000 19,912,000,000 20,042,000,000 20,158,000,000 20,352,000,000 20,996,000,000 21,218,000,000 21,615,000,000 21,758,000,000 21,829,000,000 22,145,000,000 21,892,000,000 15,021,000,000 14,816,000,000 14,639,000,000 14,271,000,000 13,642,000,000 13,291,000,000 12,187,000,000 11,922,000,000 11,638,000,000 11,411,000,000 10,730,000,000 10,537,000,000 10,360,000,000 10,195,000,000 9,683,000,000 1,109,200,000 1,059,500,000 1,031,000,000 1,008,600,000 982,600,000 955,800,000 959,000,000 966,600,000 956,200,000 929,800,000 909,000,000 910,000,000 958,300,000 
        intangibles
      1,359,000,000 1,397,000,000 1,443,000,000 497,000,000 529,000,000 518,000,000 551,000,000 585,000,000 618,000,000 654,000,000 609,000,000 641,000,000 673,000,000 705,000,000 736,000,000 768,000,000 800,000,000 831,000,000 864,000,000 896,000,000 927,000,000 959,000,000 991,000,000 1,023,000,000 1,055,000,000 1,270,000,000 1,309,000,000 405,000,000 414,000,000 424,000,000 434,000,000 435,000,000 444,000,000 453,000,000 463,000,000 473,000,000 482,000,000 492,000,000 501,000,000 511,000,000 520,000,000 466,000,000              
        goodwill
      8,736,000,000 8,755,000,000 8,732,000,000 7,645,000,000 7,645,000,000 7,645,000,000 7,645,000,000 7,645,000,000 7,645,000,000 7,645,000,000 7,645,000,000 7,645,000,000 7,645,000,000 7,645,000,000 7,645,000,000 7,645,000,000 7,657,000,000 7,657,000,000 7,657,000,000 7,657,000,000 7,657,000,000 7,657,000,000 7,657,000,000 7,722,000,000 7,722,000,000 9,536,000,000 10,735,000,000 2,581,000,000 2,581,000,000 2,586,000,000 2,586,000,000 2,460,000,000 2,460,000,000 2,245,000,000 2,245,000,000 2,245,000,000 2,245,000,000 2,199,000,000 2,199,000,000 2,199,000,000 2,200,000,000 2,559,000,000 104,700,000 104,700,000 104,700,000 104,700,000 104,700,000 104,700,000 104,700,000 104,700,000 104,700,000 104,700,000 104,700,000 104,700,000 134,200,000 
        right of use assets
      268,000,000 276,000,000 276,000,000 275,000,000 286,000,000 273,000,000 271,000,000 282,000,000 290,000,000 264,000,000 271,000,000 281,000,000 274,000,000 283,000,000 288,000,000 300,000,000 280,000,000 268,000,000 282,000,000 297,000,000 296,000,000 309,000,000 323,000,000 341,000,000 352,000,000 365,000,000 366,000,000 255,000,000 262,000,000                           
        noncurrent assets - related parties
      916,000,000 962,000,000 983,000,000 1,021,000,000 1,095,000,000 1,120,000,000 1,135,000,000 1,160,000,000 1,151,000,000 1,161,000,000 1,174,000,000 1,199,000,000 1,212,000,000 1,225,000,000 1,222,000,000 1,142,000,000 1,151,000,000 1,161,000,000 1,160,000,000 1,144,000,000 676,000,000 672,000,000 675,000,000 676,000,000 677,000,000 303,000,000 302,000,000 253,000,000 256,000,000                           
        other noncurrent assets
      1,159,000,000 1,125,000,000 1,058,000,000 1,015,000,000 998,000,000 994,000,000 984,000,000 975,000,000 976,000,000 990,000,000 966,000,000 970,000,000 954,000,000 959,000,000 952,000,000 49,000,000 50,000,000 60,000,000 61,000,000 62,000,000 64,000,000 48,000,000 48,000,000 51,000,000 50,000,000 52,000,000 55,000,000 36,000,000 33,000,000 35,000,000 36,000,000 37,000,000 28,000,000 26,000,000 22,000,000 18,000,000 17,000,000 14,000,000 14,000,000 12,000,000 11,000,000 12,000,000 4,200,000 3,700,000 8,400,000 4,000,000 1,500,000 1,500,000 2,000,000 2,100,000 2,200,000 2,300,000 2,500,000 2,800,000 5,200,000 
        total assets
      42,933,000,000 43,005,000,000 43,227,000,000 37,841,000,000 38,972,000,000 37,511,000,000 38,515,000,000 38,402,000,000 36,461,000,000 36,529,000,000 36,120,000,000 35,873,000,000 35,672,000,000 35,665,000,000 35,812,000,000 35,788,000,000 35,727,000,000 35,507,000,000 35,699,000,000 35,773,000,000 36,030,000,000 36,414,000,000 36,662,000,000 37,022,000,000 37,006,000,000 40,430,000,000 41,281,000,000 23,746,000,000 23,584,000,000 22,779,000,000 22,379,000,000 21,412,000,000 21,006,000,000 19,500,000,000 19,238,000,000 18,601,000,000 18,285,000,000 16,646,000,000 16,415,000,000 16,079,000,000 15,978,000,000 15,677,000,000 1,391,100,000 1,382,600,000 1,354,000,000 1,214,500,000 1,194,300,000 1,181,400,000 1,193,700,000 1,208,500,000 1,218,700,000 1,217,700,000 1,311,900,000 1,301,300,000 1,250,200,000 
        liabilities
                                                             
        accounts payable
      126,000,000 108,000,000 131,000,000 149,000,000 145,000,000 147,000,000 120,000,000 127,000,000 132,000,000 153,000,000 132,000,000 128,000,000 139,000,000 224,000,000 289,000,000 352,000,000 214,000,000 172,000,000 177,000,000 158,000,000 162,000,000 152,000,000 140,000,000 145,000,000 138,000,000 242,000,000 196,000,000 134,000,000 110,000,000 162,000,000 146,000,000 172,000,000 143,000,000 151,000,000 152,000,000 144,000,000 121,000,000 123,000,000 107,000,000 102,000,000 105,000,000 89,000,000 67,600,000 55,500,000 44,900,000 42,200,000 34,900,000 25,700,000 27,000,000 30,500,000 41,600,000 43,300,000 34,300,000 39,000,000 42,500,000 
        accrued liabilities
      333,000,000 254,000,000 261,000,000 262,000,000 269,000,000 295,000,000 271,000,000 246,000,000 248,000,000 300,000,000 332,000,000 241,000,000 266,000,000 269,000,000 300,000,000 415,000,000 396,000,000 363,000,000 332,000,000 258,000,000 233,000,000 194,000,000 169,000,000 138,000,000 135,000,000 187,000,000 185,000,000 148,000,000 189,000,000 250,000,000    231,000,000 202,000,000 178,000,000 194,000,000 228,000,000 193,000,000 180,000,000 159,000,000 186,000,000              
        current liabilities - related parties
      455,000,000 399,000,000 393,000,000 399,000,000 402,000,000 396,000,000 354,000,000 344,000,000 351,000,000 360,000,000 387,000,000 336,000,000 327,000,000 343,000,000 364,000,000 403,000,000 687,000,000 1,780,000,000 1,706,000,000 812,000,000 338,000,000 356,000,000 364,000,000 372,000,000 297,000,000 1,008,000,000 562,000,000 224,000,000 204,000,000                           
        accrued property, plant and equipment
      533,000,000 438,000,000 400,000,000 253,000,000 211,000,000 208,000,000 190,000,000 172,000,000 166,000,000 216,000,000 140,000,000 149,000,000 158,000,000 128,000,000 111,000,000 104,000,000 91,000,000 97,000,000 66,000,000 54,000,000 58,000,000 84,000,000 121,000,000 154,000,000 234,000,000 283,000,000 346,000,000 227,000,000 249,000,000 294,000,000    194,000,000 183,000,000 171,000,000 138,000,000 132,000,000 157,000,000 163,000,000 140,000,000 166,000,000              
        long-term debt due within one year
      1,251,000,000 1,502,000,000 1,501,000,000 1,500,000,000 2,697,000,000 1,693,000,000 2,836,000,000 2,827,000,000 1,639,000,000 1,135,000,000 1,000,000 1,000,000 1,000,000 988,000,000 982,000,000 1,000,000,000 999,000,000 499,000,000 1,000,000 1,000,000 2,000,000 764,000,000 307,000,000                    800,000 800,000 800,000 800,000 800,000 800,000 800,000 700,000 700,000 700,000 700,000 700,000 700,000 
        accrued interest payable
      264,000,000 354,000,000 273,000,000 267,000,000 203,000,000 244,000,000 220,000,000 252,000,000 187,000,000 242,000,000 187,000,000 247,000,000 192,000,000 237,000,000 192,000,000 224,000,000 192,000,000 202,000,000 188,000,000 203,000,000 189,000,000 222,000,000 207,000,000 207,000,000 214,000,000 210,000,000 226,000,000 173,000,000 156,000,000 143,000,000 179,000,000 183,000,000 99,000,000 88,000,000 64,000,000 94,000,000 70,000,000 53,000,000 55,000,000 53,000,000 56,000,000 54,000,000 2,500,000 8,400,000            
        operating lease liabilities
      53,000,000 53,000,000 49,000,000 47,000,000 47,000,000 45,000,000 49,000,000 50,000,000 50,000,000 45,000,000 48,000,000 49,000,000 45,000,000 46,000,000 44,000,000 45,000,000 47,000,000 59,000,000 61,000,000 63,000,000 63,000,000 63,000,000 65,000,000 69,000,000 67,000,000 66,000,000 61,000,000 47,000,000 46,000,000                           
        other current liabilities
      177,000,000 141,000,000 264,000,000 192,000,000 195,000,000 207,000,000 227,000,000 208,000,000 187,000,000 173,000,000 172,000,000 165,000,000 184,000,000 166,000,000 217,000,000 198,000,000 232,000,000 176,000,000 190,000,000 178,000,000 151,000,000 150,000,000 158,000,000 143,000,000 129,000,000 136,000,000 656,000,000 95,000,000 75,000,000 83,000,000 665,000,000 610,000,000 445,000,000 38,000,000 41,000,000 29,000,000 26,000,000 24,000,000 18,000,000 17,000,000 14,000,000 12,000,000 2,700,000 3,600,000 7,000,000 1,700,000 1,800,000 3,200,000 1,700,000 1,400,000 1,600,000 1,100,000 2,600,000 3,000,000 1,600,000 
        total current liabilities
      3,192,000,000 3,249,000,000 3,502,000,000 3,069,000,000 4,169,000,000 3,235,000,000 4,267,000,000 4,226,000,000 2,960,000,000 2,624,000,000 1,399,000,000 1,316,000,000 1,312,000,000 2,401,000,000 2,499,000,000 2,741,000,000 2,858,000,000 3,348,000,000 2,721,000,000 1,727,000,000 1,196,000,000 2,086,000,000 1,531,000,000 1,228,000,000 1,214,000,000 2,132,000,000 2,232,000,000 1,048,000,000 1,029,000,000 1,186,000,000 1,204,000,000 1,279,000,000 876,000,000 1,304,000,000 1,048,000,000 790,000,000 712,000,000 704,000,000 670,000,000 650,000,000 1,045,000,000 612,000,000 135,500,000 128,000,000 115,000,000 100,600,000 90,800,000 82,400,000 87,500,000 83,400,000 85,600,000 78,100,000 64,600,000 63,300,000 62,600,000 
        long-term deferred revenue
      115,000,000 119,000,000 121,000,000 308,000,000 317,000,000 317,000,000 326,000,000 344,000,000 349,000,000 347,000,000 295,000,000 268,000,000 233,000,000 219,000,000 170,000,000 429,000,000 405,000,000 383,000,000 366,000,000 349,000,000 332,000,000 314,000,000 291,000,000 261,000,000 241,000,000 217,000,000 189,000,000 108,000,000 94,000,000 80,000,000 69,000,000 58,000,000 49,000,000 42,000,000 34,000,000 26,000,000 19,000,000 12,000,000 12,000,000 9,000,000 6,000,000 4,000,000              
        long-term liabilities - related parties
      375,000,000 364,000,000 339,000,000 330,000,000 324,000,000 334,000,000 320,000,000 325,000,000 320,000,000 325,000,000 343,000,000 341,000,000 338,000,000 338,000,000 318,000,000 303,000,000 305,000,000 302,000,000 297,000,000 306,000,000 279,000,000 283,000,000 281,000,000 287,000,000 290,000,000 290,000,000 293,000,000 271,000,000 273,000,000                           
        long-term debt
      24,383,000,000 24,151,000,000 24,145,000,000 19,725,000,000 19,721,000,000 19,255,000,000 19,250,000,000 19,245,000,000 18,805,000,000 19,296,000,000 20,417,000,000 20,405,000,000 20,393,000,000 18,808,000,000 18,797,000,000 18,775,000,000 18,757,000,000 18,072,000,000 18,253,000,000 19,234,000,000 20,052,000,000 19,375,000,000 20,042,000,000 20,556,000,000 20,467,000,000 19,704,000,000 19,190,000,000 14,030,000,000 13,832,000,000 13,392,000,000 12,889,000,000 11,874,000,000 11,861,000,000 6,945,000,000 6,848,000,000 6,666,000,000 6,654,000,000 4,422,000,000 4,411,000,000 4,400,000,000 4,715,000,000 5,255,000,000 752,500,000 752,600,000 757,000,000 644,000,000 264,200,000 264,400,000 279,600,000 9,800,000 10,000,000 10,200,000 10,400,000 10,600,000 10,700,000 
        deferred income taxes
      25,000,000 25,000,000 20,000,000 18,000,000 18,000,000 18,000,000 16,000,000 16,000,000 16,000,000 16,000,000 12,000,000 13,000,000 13,000,000 13,000,000 14,000,000 14,000,000 14,000,000 10,000,000 11,000,000 11,000,000 11,000,000 12,000,000 12,000,000 11,000,000 11,000,000 12,000,000 15,000,000 11,000,000 12,000,000 13,000,000 13,000,000 11,000,000 10,000,000 5,000,000 7,000,000 7,000,000 6,000,000 5,000,000 5,000,000 368,000,000 382,000,000 377,000,000            -100,000 -100,000 
        long-term operating lease liabilities
      208,000,000 217,000,000 220,000,000 218,000,000 227,000,000 217,000,000 217,000,000 225,000,000 231,000,000 211,000,000 219,000,000 228,000,000 221,000,000 230,000,000 241,000,000 250,000,000 228,000,000 205,000,000 220,000,000 232,000,000 230,000,000 244,000,000 258,000,000 274,000,000 284,000,000 302,000,000 309,000,000 209,000,000 216,000,000                           
        other long-term liabilities
      338,000,000 352,000,000 356,000,000 124,000,000 128,000,000 125,000,000 137,000,000 135,000,000 133,000,000 126,000,000 119,000,000 113,000,000 114,000,000 142,000,000 130,000,000 167,000,000                                        
        total liabilities
      28,636,000,000 28,477,000,000 28,703,000,000 23,792,000,000 24,904,000,000 23,501,000,000 24,533,000,000 24,516,000,000 22,814,000,000 22,945,000,000 22,804,000,000 22,684,000,000 22,624,000,000 22,151,000,000 22,169,000,000 22,679,000,000 22,726,000,000 22,490,000,000 22,023,000,000 22,010,000,000 22,212,000,000 22,429,000,000 22,599,000,000 22,792,000,000 22,682,000,000 22,849,000,000 22,421,000,000 15,872,000,000 15,651,000,000 14,911,000,000 14,423,000,000 13,457,000,000 13,028,000,000 8,527,000,000 8,152,000,000 7,692,000,000 7,585,000,000 5,327,000,000 5,261,000,000 5,613,000,000 6,323,000,000 6,423,000,000 898,000,000 890,200,000 878,000,000 750,800,000 361,000,000 352,700,000 372,600,000 94,400,000 96,900,000 89,100,000 75,700,000 74,500,000 74,600,000 
        commitments and contingencies
                                                             
        equity
                                                             
        common unitholders - public
      9,332,000,000 9,451,000,000 9,513,000,000 9,402,000,000 9,472,000,000 9,322,000,000 9,378,000,000 9,392,000,000 8,997,000,000 8,700,000,000 8,533,000,000 8,508,000,000 8,459,000,000 8,413,000,000 8,569,000,000 8,518,000,000 8,505,000,000 8,579,000,000 8,919,000,000 9,061,000,000 9,226,000,000 9,384,000,000 9,436,000,000 9,469,000,000 9,509,000,000 10,800,000,000 11,289,000,000 8,305,000,000 8,326,000,000 8,336,000,000 8,367,000,000 8,366,000,000 8,385,000,000 8,379,000,000 8,457,000,000 8,360,000,000 8,147,000,000 8,086,000,000 7,898,000,000 7,658,000,000 7,805,000,000 7,691,000,000 647,100,000 647,100,000 641,700,000 639,000,000 417,100,000 416,000,000 414,500,000 412,000,000 412,000,000 412,700,000 412,600,000 410,700,000  
        common unitholders - mpc
      4,734,000,000 4,845,000,000 4,778,000,000 4,413,000,000 4,361,000,000 4,257,000,000 4,172,000,000 4,062,000,000 3,858,000,000 3,758,000,000 3,581,000,000 3,480,000,000 3,388,000,000 3,293,000,000 3,276,000,000 2,784,000,000 2,698,000,000  2,944,000,000 2,897,000,000 2,796,000,000                                   
        accumulated other comprehensive income
      5,000,000 5,000,000 5,000,000 5,000,000 5,000,000                                                   
        total mplx lp partners’ capital
      14,071,000,000 14,301,000,000 14,296,000,000 13,820,000,000 13,838,000,000 13,576,000,000 13,547,000,000 13,451,000,000 12,852,000,000 12,454,000,000 12,110,000,000 11,984,000,000 11,843,000,000 12,309,000,000 12,438,000,000 11,905,000,000 11,796,000,000 11,811,000,000 12,447,000,000 12,552,000,000 12,606,000,000 12,772,000,000 12,848,000,000 13,015,000,000 13,108,000,000 16,364,000,000 17,642,000,000 6,619,000,000 6,679,000,000 6,708,000,000 6,798,000,000 6,802,000,000 6,832,000,000 9,827,000,000 9,941,000,000 9,763,000,000 9,557,000,000 10,301,000,000 10,137,000,000 9,458,000,000 9,641,000,000 9,241,000,000 487,300,000 486,700,000 470,300,000 458,200,000 491,500,000 488,400,000 484,000,000 646,200,000 647,800,000 647,500,000 695,600,000 691,100,000  
        noncontrolling interests
      226,000,000 227,000,000 228,000,000 229,000,000 230,000,000 231,000,000 232,000,000 233,000,000 234,000,000 235,000,000 236,000,000 237,000,000 237,000,000 237,000,000 238,000,000 239,000,000 240,000,000 241,000,000 243,000,000 243,000,000 244,000,000 245,000,000 247,000,000 247,000,000 248,000,000 249,000,000 250,000,000 250,000,000 250,000,000 156,000,000 155,000,000 150,000,000 146,000,000 146,000,000 145,000,000 146,000,000                    
        total equity
      14,297,000,000 14,528,000,000 14,524,000,000 14,049,000,000 14,068,000,000 13,807,000,000 13,779,000,000 13,684,000,000 13,086,000,000 12,689,000,000 12,346,000,000 12,221,000,000 12,080,000,000 12,546,000,000 12,676,000,000 12,144,000,000 12,036,000,000 12,052,000,000 12,690,000,000 12,795,000,000 12,850,000,000 13,017,000,000 13,095,000,000 13,262,000,000 13,356,000,000 16,613,000,000 17,892,000,000 6,869,000,000 6,929,000,000 6,864,000,000 6,953,000,000 6,952,000,000 6,978,000,000 9,973,000,000 10,086,000,000 9,909,000,000 9,700,000,000 10,319,000,000 10,154,000,000 9,473,000,000 9,655,000,000 9,254,000,000 493,100,000 492,400,000 476,000,000 463,700,000 833,300,000 828,700,000 821,100,000 1,114,100,000 1,121,800,000 1,128,600,000 1,236,200,000   
        total liabilities, preferred units and equity
      42,933,000,000 43,005,000,000 43,227,000,000 37,841,000,000 38,972,000,000 37,511,000,000 38,515,000,000 38,402,000,000 36,461,000,000 36,529,000,000 36,120,000,000 35,873,000,000 35,672,000,000 35,665,000,000 35,812,000,000 35,788,000,000 35,727,000,000 35,507,000,000 35,699,000,000 35,773,000,000 36,030,000,000 36,414,000,000 36,662,000,000 37,022,000,000 37,006,000,000 40,430,000,000 41,281,000,000 23,746,000,000 23,584,000,000 22,779,000,000 22,379,000,000 21,412,000,000 21,006,000,000 19,500,000,000 19,238,000,000 18,601,000,000 18,285,000,000 16,646,000,000 16,415,000,000 16,079,000,000                
        series a preferred units -
           203,000,000    895,000,000    968,000,000                                          
        assets held for sale
        1,034,000,000                20,000,000   188,000,000                                  
        liabilities held for sale
        230,000,000                   101,000,000                                  
        series a preferred units
            203,000,000 202,000,000 561,000,000  970,000,000 968,000,000 968,000,000  967,000,000 965,000,000 965,000,000 965,000,000 986,000,000 968,000,000 968,000,000 968,000,000 968,000,000 968,000,000 968,000,000 968,000,000 968,000,000 1,005,000,000                            
        receivables
          858,000,000 718,000,000 742,000,000 747,000,000 752,000,000 823,000,000 833,000,000 717,000,000 714,000,000 737,000,000 941,000,000 789,000,000 741,000,000 654,000,000 617,000,000 538,000,000 523,000,000 452,000,000 477,000,000 562,000,000 522,000,000 593,000,000 570,000,000 335,000,000 365,000,000 417,000,000 452,000,000 363,000,000 300,000,000 292,000,000 320,000,000 284,000,000 255,000,000 297,000,000 289,000,000 265,000,000 250,000,000 244,000,000 11,800,000 12,600,000 8,600,000 10,200,000 8,900,000 10,900,000 12,200,000 12,200,000 14,300,000 12,800,000 14,000,000 17,600,000 13,700,000 
        accumulated other comprehensive loss
           -3,000,000 -3,000,000 -3,000,000 -3,000,000 -4,000,000 -4,000,000 -4,000,000 -4,000,000 -8,000,000 -8,000,000 -8,000,000 -8,000,000 -17,000,000 -17,000,000 -17,000,000 -17,000,000 -15,000,000 -16,000,000 -16,000,000 -16,000,000 -15,000,000 -15,000,000 -15,000,000 -15,000,000 -16,000,000 -16,000,000 -16,000,000 -16,000,000 -14,000,000 -14,000,000                     
        series b preferred units
                   611,000,000 601,000,000 611,000,000 601,000,000 611,000,000 601,000,000 611,000,000 601,000,000 611,000,000 601,000,000 611,000,000 601,000,000 611,000,000 601,000,000                             
        current assets:
                                                             
        current liabilities:
                                                             
        deferred credits and other liabilities
                      159,000,000 170,000,000 155,000,000 151,000,000 112,000,000 115,000,000 184,000,000 175,000,000 175,000,000 192,000,000 193,000,000 195,000,000 195,000,000 197,000,000 205,000,000 188,000,000 183,000,000 188,000,000 175,000,000 170,000,000 168,000,000 169,000,000 151,000,000 176,000,000 166,000,000 166,000,000 1,600,000 1,800,000 1,400,000 2,200,000 1,800,000 1,600,000 1,400,000 1,200,000 1,300,000 800,000 700,000 600,000 1,300,000 
        common unitholder - mpc
                       2,638,000,000    2,792,000,000 2,827,000,000 2,951,000,000 3,014,000,000 4,968,000,000 5,767,000,000 -1,671,000,000 -1,632,000,000 -1,612,000,000 -1,553,000,000 -1,548,000,000 -1,537,000,000 1,278,000,000 1,302,000,000 1,161,000,000 1,184,000,000 1,069,000,000 1,097,000,000 1,049,000,000 1,086,000,000 465,000,000 492,700,000 266,700,000 263,800,000 261,100,000 61,000,000 60,500,000 59,700,000 57,400,000 57,900,000 58,600,000 58,800,000 57,400,000  
        equity of predecessor
                                                             
        redeemable preferred units
                                  1,004,000,000 1,004,000,000 1,003,000,000 1,003,000,000 1,000,000,000 1,000,000,000 1,000,000,000 1,000,000,000 1,000,000,000 1,000,000,000 1,000,000,000 993,000,000                
        increase/(decrease) in cash, cash equivalents and restricted cash
                                                             
        operating activities:
                                                             
        net income
                                  509,000,000 1,834,000,000      378,000,000      157,000,000 139,100,000 97,300,000    98,600,000 55,700,000   70,100,000 35,300,000 144,000,000 101,900,000 
        adjustments to reconcile net income to net cash from operating activities:
                                                             
        amortization of deferred financing costs
                                  13,000,000 59,000,000      25,000,000                    
        depreciation and amortization
                                  211,000,000 766,000,000      351,000,000      89,000,000              
        asset retirement expenditures
                                   -7,000,000      -1,000,000      -1,000,000 -700,000 -300,000    -900,000 -200,000   -1,600,000 -400,000 -9,200,000  
        loss on disposal of assets
                                  1,000,000                           
        income from equity method investments
                                  -70,000,000 -240,000,000                          
        distributions from unconsolidated affiliates
                                  101,000,000 400,000,000      66,000,000      15,000,000              
        changes in:
                                                             
        current receivables
                                  57,000,000 -122,000,000      17,000,000      -29,000,000 -1,600,000 -2,400,000    1,300,000    4,800,000 3,600,000 -2,000,000 1,900,000 
        fair value of derivatives
                                  7,000,000 -10,000,000      -22,000,000                    
        current accounts payable and accrued liabilities
                                  -78,000,000 100,000,000      -16,000,000      4,000,000 12,700,000 14,300,000    -1,800,000 -2,300,000   1,100,000 -7,100,000 -8,000,000 800,000 
        current assets/current liabilities - related parties
                                  -147,000,000                           
        right of use assets/operating lease liabilities
                                  3,000,000                           
        deferred revenue
                                  14,000,000 39,000,000    5,000,000 3,000,000 3,000,000 3,000,000 2,000,000                  
        all other
                                  -4,000,000 45,000,000      32,000,000      17,000,000 1,800,000 1,100,000    -1,800,000 -500,000   -1,000,000 2,400,000 300,000 -5,200,000 
        net cash from operating activities
                                  618,000,000 2,826,000,000      844,000,000      239,000,000 184,900,000 127,900,000    128,400,000 71,900,000   108,600,000 46,700,000 190,600,000 121,800,000 
        investing activities:
                                                             
        additions to property, plant and equipment
                                  -457,000,000 -1,919,000,000      -652,000,000      -264,000,000 -121,100,000 -63,500,000    -13,200,000 -5,100,000   -40,800,000 -9,200,000 -135,600,000 -109,200,000 
        acquisitions, net of cash acquired
                                  1,000,000 -451,000,000      -220,000,000      -1,218,000,000              
        disposal of assets
                                  7,000,000 8,000,000      3,000,000       400,000 400,000          1,300,000 100,000 
        investments in unconsolidated affiliates
                                  -128,000,000 -341,000,000      -640,000,000      -14,000,000              
        distributions from unconsolidated affiliates - return of capital
                                  2,000,000 16,000,000      24,000,000                    
        net cash from investing activities
                                  -575,000,000 -2,686,000,000      -1,404,000,000      -1,498,000,000 -119,100,000 -64,200,000    -9,400,000 -6,600,000   -40,800,000 -9,200,000 87,400,000 112,600,000 
        financing activities:
                                                             
        long-term debt - borrowings
                                  825,000,000 13,186,000,000      2,241,000,000      1,490,000,000 528,200,000 528,200,000    270,000,000 270,000,000       
        - repayments
                                  -400,000,000 -6,780,000,000      -1,000,000      -1,441,000,000 -415,700,000 -415,400,000    -15,400,000 -200,000       
        related party debt - borrowings
                                  851,000,000 3,962,000,000      12,000,000      301,000,000              
        debt issuance costs
                                   -76,000,000      -21,000,000      -11,000,000 -4,400,000 -4,400,000          -2,400,000  
        distributions to mpc for acquisitions
                                   -4,111,000,000                          
        distributions to noncontrolling interests
                                  -6,000,000 -17,000,000      -2,000,000      -1,000,000              
        distributions to preferred unitholders
                                  -20,000,000 -71,000,000      -33,000,000                    
        distributions to unitholders and general partner
                                  -515,000,000 -1,819,000,000      -505,000,000      -158,000,000           -13,300,000   
        contributions from noncontrolling interests
                                  94,000,000 11,000,000      128,000,000                    
        net cash (used in)/provided by financing activities
                                  -26,000,000 -73,000,000                          
        net increase/(decrease) in cash, cash equivalents and restricted cash
                                  17,000,000 67,000,000                          
        cash, cash equivalents and restricted cash at beginning of period
                                  76,000,000 9,000,000                          
        cash, cash equivalents and restricted cash at end of period
                                  93,000,000 76,000,000                          
        receivables - related parties
                                   289,000,000 318,000,000 294,000,000 330,000,000 160,000,000 152,000,000 173,000,000 198,000,000 122,000,000 106,000,000 113,000,000 102,000,000               
        long-term receivables - related parties
                                   24,000,000 23,000,000 22,000,000 21,000,000 20,000,000 18,000,000 16,000,000 13,000,000 4,000,000 3,000,000 26,000,000 25,000,000               
        payables - related parties
                                   203,000,000 165,000,000 273,000,000 146,000,000 516,000,000 317,000,000 93,000,000 91,000,000 75,000,000 68,000,000 65,000,000 512,000,000               
        deferred revenue - related parties
                                   51,000,000 49,000,000 41,000,000 43,000,000 43,000,000 42,000,000 39,000,000 38,000,000 34,000,000 35,000,000 38,000,000 35,000,000 32,000,000 30,500,000 30,000,000 33,400,000 30,500,000 30,100,000 30,200,000 29,000,000 34,000,000 27,100,000 18,300,000 13,200,000   
        long-term deferred revenue - related parties
                                   43,000,000 43,000,000 47,000,000 49,000,000 43,000,000 40,000,000 33,000,000 26,000,000 15,000,000 12,000,000 10,000,000 9,000,000 9,000,000 8,400,000 7,800,000 4,600,000 4,000,000 4,200,000 4,300,000 4,100,000       
        general partner - mpc
                                       -637,000,000 -626,000,000 -242,000,000 -257,000,000 1,013,000,000 1,009,000,000 485,000,000 484,000,000 819,000,000 -652,500,000 -655,000,000 -657,700,000 -659,400,000 -203,700,000 -204,100,000 -204,500,000 -32,500,000 -32,500,000 -32,600,000 13,900,000 13,700,000  
        impairment expense
                                                             
        loss/(gain) on disposal of assets
                                   2,000,000                          
        receivables from/liabilities to related parties
                                   -50,000,000                          
        prepaid other current assets from related parties
                                   7,000,000                          
        investments - net related party loans
                                         80,000,000                    
        net proceeds from equity offerings
                                         443,000,000      1,000,000 1,300,000 1,300,000            
        issuance of redeemable preferred units
                                                             
        distributions to mpc from predecessor
                                         -113,000,000                    
        contributions from mpc
                                                             
        consideration payment to class b unitholders
                                                             
        accrued taxes
                                       38,000,000 44,000,000 39,000,000 31,000,000 33,000,000 37,000,000 32,000,000 24,000,000 26,000,000 6,300,000 8,600,000 7,100,000 5,200,000 5,900,000 5,400,000 4,800,000 4,000,000 4,700,000 4,600,000 3,700,000 3,000,000 6,000,000 
        class b unitholders
                                         133,000,000 133,000,000 133,000,000 133,000,000 266,000,000 266,000,000 266,000,000              
        common unitholder - gp
                                       821,000,000 822,000,000 351,000,000 350,000,000                   
        increase in cash and cash equivalents
                                                             
        gain on disposal of assets
                                         -1,000,000                    
        (income) income from equity method investments
                                         -6,000,000                    
        receivables from / liabilities to related parties
                                         22,000,000      -8,000,000 -4,600,000 -7,500,000    7,700,000 6,300,000   11,700,000 3,000,000   
        distribution to mpc for acquisition
                                         -1,511,000,000                    
        net cash from financing activities
                                         619,000,000      1,275,000,000 -2,700,000 39,400,000    -129,900,000 -78,800,000   -169,200,000 -26,300,000 -61,400,000 -166,000,000 
        net increase in cash and cash equivalents
                                         59,000,000      16,000,000 63,100,000 103,100,000     -13,500,000   -101,400,000 11,200,000 216,600,000 68,400,000 
        cash and cash equivalents at beginning of period
                                         234,000,000      27,000,000 27,300,000 27,300,000    54,100,000 54,100,000   216,700,000 216,700,000 100,000 100,000 
        cash and cash equivalents at end of period
                                         293,000,000      43,000,000 90,400,000 130,400,000    43,200,000 40,600,000   115,300,000 227,900,000 216,700,000 68,500,000 
        noncontrolling interest
                                          143,000,000 18,000,000 17,000,000 15,000,000 14,000,000 13,000,000           540,600,000 535,700,000  
        total liabilities and equity
                                              15,978,000,000 15,677,000,000 1,391,100,000 1,382,600,000 1,354,000,000 1,214,500,000 1,194,300,000 1,181,400,000 1,193,700,000 1,208,500,000 1,218,700,000 1,217,700,000 1,311,900,000   
        receivables from related parties
                                               88,000,000 54,900,000 52,700,000 51,200,000 41,000,000 45,900,000 45,400,000 52,500,000 48,300,000 40,500,000 37,100,000 40,700,000 38,000,000 59,700,000 
        long-term receivables from related parties
                                               25,000,000              
        payables to related parties
                                               47,000,000 25,100,000 21,100,000 21,800,000 20,200,000 17,300,000 17,100,000 24,200,000 12,800,000 9,900,000 10,100,000 10,100,000 17,600,000 3,700,000 
        subordinated unitholder - mpc
                                                 227,900,000 222,500,000 217,500,000 217,100,000 216,000,000 214,300,000 209,300,000 210,400,000 208,800,000 210,300,000 209,300,000  
        net income on disposal of assets
                                               1,000,000 200,000 200,000            
        equity in earnings from unconsolidated affiliates
                                               -3,000,000              
        materials and supplies inventories
                                               1,000,000 11,800,000 11,700,000 11,500,000 11,700,000 11,600,000 11,700,000 11,700,000 11,600,000 11,600,000 12,400,000 10,700,000   
        change in fair value of derivatives
                                               -6,000,000              
        issuance of units in markwest merger
                                               169,000,000              
        contributions from mpc - markwest merger
                                               1,230,000,000              
        distributions related to purchase of additional interest in pipe line holdings
                                               -12,000,000      -310,000,000 -310,000,000       
        noncontrolling interest retained by mpc
                                                5,800,000 5,700,000 5,700,000 5,500,000 341,800,000 340,300,000 337,100,000 467,900,000 474,000,000 481,100,000    
        depreciation
                                                38,100,000 25,400,000    25,000,000 12,600,000   23,600,000 11,700,000 39,400,000 27,800,000 
        quarterly distributions to unitholders and general partner
                                                -111,600,000 -70,000,000    -48,700,000 -23,700,000   -33,900,000    
        quarterly distributions to noncontrolling interest retained by mpc
                                                -500,000 -300,000    -25,800,000 -14,900,000   -34,900,000    
        net decrease in cash and cash equivalents
                                                     -10,900,000        
        investments—loans to related party
                                                            221,700,000 
        long-term debt—repayments
                                                         -400,000 -200,000  -500,000 
        distributions related to purchase of additional 5.0% interest in pipe line holdings
                                                         -100,000,000    
        distributions to noncontrolling interest
                                                          -12,800,000   
        loans receivable from related party
                                                             
        materials & supplies inventories
                                                           8,900,000  
        payroll and benefits payable
                                                            8,100,000 
        equity / net investment
                                                             
        net investment
                                                            1,175,600,000 
        total equity / net investment
                                                           1,226,800,000  
        total liabilities and equity / net investment
                                                           1,301,300,000  
        net income on sale of assets
                                                           300,000 300,000 
        receivables from / payables to related parties
                                                           26,900,000 -4,500,000 
        investments in related party debt securities – purchases
                                                             
        – redemptions
                                                             
        investments – loans to related party
                                                           221,700,000  
        long-term debt – repayments
                                                           -700,000  
        net proceeds from initial public offering
                                                           407,100,000  
        proceeds from initial public offering distributed to mpc
                                                           -202,700,000  
        contributions from (distributions to) mpc
                                                           -262,700,000 -165,500,000 
        total net investment
                                                            1,175,600,000 
        total liabilities and net investment
                                                            1,250,200,000 
        investments in related party debt securities—purchases
                                                             
        —redemptions
                                                             
      Cashflow Statements:
      Quarterly
      Annual
        Unit: USD2026-03-31 2025-12-31 2025-09-30 2025-06-30 2025-03-31 2024-12-31 2024-09-30 2024-06-30 2024-03-31 2023-12-31 2023-09-30 2023-06-30 2023-03-31 2022-12-31 2022-09-30 2022-06-30 2022-03-31 2021-12-31 2021-09-30 2021-06-30 2021-03-31 2020-12-31 2020-09-30 2020-06-30 2020-03-31 2019-12-31 2019-09-30 2019-06-30 2019-03-31 2018-12-31 2018-09-30 2018-06-30 2018-03-31 2017-12-31 2017-09-30 2017-06-30 2017-03-31 2016-12-31 2016-09-30 2016-06-30 2016-03-31 2015-12-31 2015-09-30 2015-06-30 2015-03-31 2014-12-31 2014-09-30 2014-06-30 2014-03-31 2013-12-31 2013-09-30 2013-06-30 2013-03-31 2012-12-31 
                                                              
          operating activities:
                                                              
          net income
        922,000,000 1,203,000,000 1,555,000,000 1,058,000,000 1,136,000,000 1,109,000,000 1,047,000,000 1,186,000,000 1,015,000,000 1,144,000,000 928,000,000 942,000,000 952,000,000 824,000,000 1,437,000,000 884,000,000 833,000,000 838,000,000   748,000,000     -573,000,000 1,038,000,000 488,000,000 509,000,000 439,000,000 516,000,000 456,000,000 423,000,000 241,000,000 217,000,000 191,000,000 187,000,000 132,000,000 143,000,000 20,000,000 -37,000,000 17,900,000 41,800,000 51,400,000 45,900,000 36,400,000 43,100,000 42,900,000 55,700,000 36,800,000 39,200,000 34,800,000 35,300,000 42,100,000 
          adjustments to reconcile net income to net cash from operating activities:
                                                              
          amortization of deferred financing costs and debt discount
        7,000,000 7,000,000 7,000,000                                                    
          depreciation and amortization
        358,000,000 355,000,000 346,000,000 324,000,000 326,000,000 324,000,000 322,000,000 320,000,000 317,000,000 306,000,000 301,000,000 310,000,000 296,000,000 305,000,000 302,000,000 310,000,000 313,000,000 316,000,000 324,000,000 318,000,000 329,000,000 385,000,000 346,000,000 321,000,000 325,000,000 338,000,000 491,000,000 214,000,000 211,000,000 201,000,000 201,000,000 188,000,000 176,000,000 168,000,000 164,000,000 164,000,000 187,000,000 139,000,000 138,000,000 137,000,000 132,000,000              
          loss on disposal of assets
        1,000,000 -160,000,000    2,000,000   1,000,000 -2,000,000   11,000,000 7,000,000 -2,000,000 18,000,000 -17,000,000 3,000,000          1,000,000                          
          income from equity method investments
        -182,000,000 -155,000,000 -186,000,000 -170,000,000 -186,000,000 -171,000,000 -149,000,000 -325,000,000 -157,000,000 -162,000,000 -159,000,000 -145,000,000 -134,000,000  -125,000,000 -111,000,000 -99,000,000         -35,000,000 -112,000,000 -73,000,000 -70,000,000 -65,000,000 -64,000,000 -50,000,000 -61,000,000    -5,000,000                  
          distributions from unconsolidated affiliates
        237,000,000 233,000,000 236,000,000 207,000,000 188,000,000 230,000,000 219,000,000 197,000,000 180,000,000 210,000,000 195,000,000 191,000,000 140,000,000 173,000,000 147,000,000 138,000,000 120,000,000 147,000,000 122,000,000 120,000,000 119,000,000 109,000,000 124,000,000 107,000,000 119,000,000 146,000,000 159,000,000 119,000,000 101,000,000 121,000,000 104,000,000 107,000,000 68,000,000 105,000,000 70,000,000 33,000,000 33,000,000 37,000,000 33,000,000 40,000,000 38,000,000              
          change in fair value of derivatives
        64,000,000 -10,000,000 -4,000,000 -7,000,000 4,000,000 -10,000,000 -3,000,000 2,000,000 8,000,000  15,000,000 -13,000,000 -5,000,000 15,000,000 -46,000,000 -7,000,000 -9,000,000                    -18,000,000 15,000,000 3,000,000 13,000,000 12,000,000              
          changes in:
                                                              
          current receivables
        -24,000,000 4,000,000 12,000,000            -88,000,000 -44,000,000 -87,000,000 -37,000,000 -79,000,000 -16,000,000 -67,000,000 -7,000,000 38,000,000 -40,000,000 71,000,000 -21,000,000 -44,000,000 25,000,000 57,000,000 35,000,000 -86,000,000 -63,000,000 -8,000,000 28,000,000 -37,000,000 -27,000,000 44,000,000 -8,000,000 -24,000,000 -15,000,000 -5,000,000 -27,400,000 800,000 -4,000,000 1,600,000 -1,300,000 2,000,000   2,100,000 -1,500,000 1,200,000 3,600,000 -3,900,000 
          inventories
        -6,000,000 -7,000,000 -7,000,000 -6,000,000 -6,000,000 -9,000,000 -2,000,000 -5,000,000 -4,000,000 -4,000,000 -8,000,000 -5,000,000 -2,000,000 2,000,000 8,000,000 -8,000,000 -7,000,000 -2,000,000 -14,000,000 3,000,000 -11,000,000 -4,000,000 -1,000,000 -10,000,000 3,000,000 -6,000,000 -4,000,000 -2,000,000 3,000,000 5,000,000 -5,000,000 -7,000,000 2,000,000 -1,000,000   -4,000,000 -1,000,000 -4,000,000 1,000,000              
          current liabilities and other current assets
        -15,000,000 26,000,000 -33,000,000                                                    
          assets and liabilities - related parties
        -25,000,000 21,000,000 5,000,000 135,000,000 -35,000,000 107,000,000                                                 
          right of use assets and operating lease liabilities
         2,000,000 2,000,000 -1,000,000 -6,000,000                                                 
          deferred revenue
        -1,000,000 -22,000,000 -19,000,000 -21,000,000 -12,000,000 -7,000,000 -11,000,000 4,000,000 9,000,000 42,000,000 30,000,000 32,000,000 3,000,000 44,000,000 23,000,000 25,000,000 16,000,000 23,000,000 22,000,000 19,000,000 24,000,000 27,000,000 36,000,000 22,000,000 27,000,000 42,000,000 29,000,000 15,000,000 14,000,000 9,000,000 14,000,000 9,000,000 7,000,000                      
          all other
        11,000,000 -5,000,000 6,000,000 -2,000,000 -8,000,000 3,000,000 13,000,000 -3,000,000 -28,000,000 9,000,000 -6,000,000 9,000,000 -17,000,000 15,000,000 -9,000,000 45,000,000 15,000,000 -18,000,000 14,000,000 15,000,000 -3,000,000 -20,000,000 -4,000,000 30,000,000 -14,000,000 27,000,000 -4,000,000 50,000,000 9,000,000 -17,000,000 3,000,000 -15,000,000 11,000,000 16,000,000 16,000,000 2,000,000 -3,000,000 6,000,000 15,000,000 15,200,000 700,000 2,500,000 -1,400,000   -1,300,000 -500,000 2,000,000 1,400,000 -3,400,000 2,400,000 5,500,000 
          net cash from operating activities
        1,347,000,000 1,496,000,000 1,431,000,000 1,736,000,000 1,246,000,000 1,675,000,000 1,415,000,000 1,565,000,000 1,291,000,000 1,489,000,000 1,244,000,000 1,437,000,000 1,227,000,000 1,368,000,000 1,039,000,000 1,487,000,000 1,125,000,000 1,240,000,000 1,182,000,000 1,365,000,000 1,124,000,000 1,185,000,000 1,222,000,000 1,105,000,000 1,009,000,000 1,092,000,000 1,538,000,000 834,000,000 618,000,000 799,000,000 737,000,000 840,000,000 450,000,000 569,000,000 494,000,000 467,000,000 377,000,000 356,000,000 339,000,000 298,000,000 295,000,000 54,100,000 57,000,000 69,400,000 58,500,000 56,500,000 61,900,000 56,500,000 71,900,000 45,100,000 58,500,000 61,900,000 46,700,000 68,800,000 
          capital expenditures
        -575,000,000 -714,000,000 -526,000,000 -301,000,000 -267,000,000 -308,000,000 -280,000,000 -213,000,000 -255,000,000 -275,000,000 -230,000,000 -263,000,000 -169,000,000 -271,000,000 -241,000,000 -125,000,000 -169,000,000 -155,000,000 -139,000,000 -109,000,000 -126,000,000 -201,000,000 -274,000,000 -329,000,000 -379,000,000 -688,000,000 -836,000,000 -427,000,000 -457,000,000 -536,000,000 -521,000,000 -407,000,000 -455,000,000 -407,000,000 -352,000,000 -372,000,000 -280,000,000 -332,000,000 -305,000,000 -278,000,000 -291,000,000 -142,900,000 -57,600,000 -33,800,000 -29,700,000 -31,500,000 -33,900,000 -8,100,000 -5,100,000 -25,500,000 -40,200,000 -31,600,000 -9,200,000 -26,400,000 
          free cash flows
        772,000,000 782,000,000 905,000,000 1,435,000,000 979,000,000 1,367,000,000 1,135,000,000 1,352,000,000 1,036,000,000 1,214,000,000 1,014,000,000 1,174,000,000 1,058,000,000 1,097,000,000 798,000,000 1,362,000,000 956,000,000 1,085,000,000 1,043,000,000 1,256,000,000 998,000,000 984,000,000 948,000,000 776,000,000 630,000,000 404,000,000 702,000,000 407,000,000 161,000,000 263,000,000 216,000,000 433,000,000 -5,000,000 162,000,000 142,000,000 95,000,000 97,000,000 24,000,000 34,000,000 20,000,000 4,000,000 -88,800,000 -600,000 35,600,000 28,800,000 25,000,000 28,000,000 48,400,000 66,800,000 19,600,000 18,300,000 30,300,000 37,500,000 42,400,000 
          investing activities:
                                                              
          additions to property, plant and equipment
        -575,000,000 -714,000,000 -526,000,000 -301,000,000 -267,000,000 -308,000,000 -280,000,000 -213,000,000 -255,000,000 -275,000,000 -230,000,000 -263,000,000 -169,000,000 -271,000,000 -241,000,000 -125,000,000 -169,000,000 -155,000,000 -139,000,000 -109,000,000 -126,000,000 -201,000,000 -274,000,000 -329,000,000 -379,000,000 -688,000,000 -836,000,000 -427,000,000 -457,000,000 -536,000,000 -521,000,000 -407,000,000 -455,000,000 -407,000,000 -352,000,000 -372,000,000 -280,000,000 -332,000,000 -305,000,000 -278,000,000 -291,000,000 -142,900,000 -57,600,000 -33,800,000 -29,700,000 -31,500,000 -33,900,000 -8,100,000 -5,100,000 -25,500,000 -40,200,000 -31,600,000 -9,200,000 -26,400,000 
          acquisitions, net of cash acquired
        14,000,000 -3,079,000,000 -237,000,000 -622,000,000               5,000,000 1,000,000    -29,000,000 -220,000,000                  
          disposal of assets
        4,000,000 974,000,000 1,000,000     1,000,000 7,000,000   10,000,000 7,000,000 64,000,000 3,000,000 49,000,000 3,000,000 4,000,000 70,000,000 2,000,000 11,000,000 4,000,000 39,000,000 16,000,000 6,000,000 1,000,000 7,000,000 3,000,000 1,000,000 2,000,000 2,000,000 3,000,000 1,000,000 4,000,000 -1,000,000                1,200,000 
          investments - acquisitions and contributions
        -238,000,000 -232,000,000 -309,000,000 -348,000,000 -119,000,000 -50,000,000 -260,000,000                                                
          investments - redemptions, repayments, return of capital and sales proceeds
         150,000,000 83,000,000 39,000,000 21,000,000                                                  
          net cash from investing activities
        -791,000,000 78,000,000 -3,731,000,000 -602,000,000 -601,000,000 -349,000,000 -536,000,000 -114,000,000 -996,000,000 -525,000,000 -236,000,000 -271,000,000 -220,000,000 -280,000,000 -265,000,000 -135,000,000 -276,000,000 -141,000,000 -132,000,000 -155,000,000 -90,000,000 -202,000,000 -283,000,000 -415,000,000 -362,000,000 -874,000,000 -1,014,000,000 -600,000,000 -575,000,000 -659,000,000 -1,073,000,000 -464,000,000 -490,000,000 -470,000,000 -433,000,000 -451,000,000 -953,000,000 -363,000,000 -323,000,000 -286,000,000 -240,000,000 -1,378,900,000 -54,900,000 -34,900,000 -29,300,000 -32,000,000 -33,700,000 -2,800,000 -6,600,000 -32,600,000 -40,200,000 -31,600,000 -9,200,000 -25,200,000 
          financing activities:
                                                              
          long-term debt borrowings
        1,489,000,000 4,563,000,000 1,000,000 1,977,000,000   1,589,000,000                                          
          long-term debt repayments
        -1,505,000,000 -762,000,000 -1,202,000,000 -500,000,000 -1,150,000,000   -1,000,000 -1,000,000,000                                          
          debt issuance costs
        -15,000,000 -1,000,000 -42,000,000 -1,000,000 -19,000,000 -1,000,000   -15,000,000 -13,000,000 -16,000,000     -2,000,000       -23,000,000 -53,000,000 -4,000,000 -4,000,000 -21,000,000     -6,600,000 -600,000 -3,800,000          
          unit repurchases
        -50,000,000 -100,000,000 -100,000,000 -100,000,000 -100,000,000 -100,000,000 -76,000,000 -75,000,000 -75,000,000     -176,000,000 -180,000,000 -35,000,000 -100,000,000 -165,000,000 -155,000,000 -155,000,000 -155,000,000                                  
          distributions to noncontrolling interests
        -11,000,000 -11,000,000 -11,000,000 -11,000,000 -11,000,000 -11,000,000 -11,000,000 -11,000,000 -11,000,000 -11,000,000 -11,000,000 -9,000,000 -10,000,000 -9,000,000 -10,000,000 -10,000,000 -9,000,000 -10,000,000 -9,000,000 -10,000,000 -10,000,000 -11,000,000 -9,000,000 -8,000,000 -9,000,000 -10,000,000 -8,000,000 -6,000,000 -6,000,000 -7,000,000 -4,000,000 -3,000,000 -3,000,000 -3,000,000 -2,000,000 -2,000,000 -2,000,000 -1,000,000              
          distributions to series a preferred unitholders
         -6,000,000 -6,000,000 -5,000,000 -10,000,000 -23,000,000 -25,000,000 -23,000,000 -23,000,000 -23,000,000 -22,000,000 -21,000,000 -21,000,000 -21,000,000 -39,000,000 -20,000,000 -21,000,000 -20,000,000 -20,000,000 -20,000,000 -21,000,000 -20,000,000 -20,000,000 -21,000,000                            
          distributions to lp unitholders
        -1,093,000,000 -1,095,000,000 -975,000,000 -976,000,000 -972,000,000                                                  
          contributions from mpc
        4,000,000 4,000,000 6,000,000 7,000,000 7,000,000 9,000,000 8,000,000 8,000,000 10,000,000 11,000,000 7,000,000 5,000,000 8,000,000 14,000,000 13,000,000 7,000,000 10,000,000 14,000,000 14,000,000 10,000,000 7,000,000 16,000,000 14,000,000 6,000,000 14,000,000 22,000,000                             
          net cash from financing activities
        -1,187,000,000 -1,202,000,000 2,679,000,000 -2,282,000,000 370,000,000 -2,233,000,000 -954,000,000 665,000,000 -958,000,000 -876,000,000 -803,000,000 -804,000,000 -852,000,000 -971,000,000 -951,000,000 -1,096,000,000 -820,000,000 -1,125,000,000 -1,019,000,000 -1,226,000,000 -1,025,000,000 -996,000,000 -978,000,000 -680,000,000 -605,000,000 -244,000,000 -499,000,000    366,000,000 -373,000,000 37,000,000 -97,000,000 -351,000,000 12,000,000 607,000,000 33,000,000 157,000,000 19,000,000 -94,000,000 1,277,700,000 -42,100,000 -36,600,000 76,000,000 -29,400,000 -39,200,000 -51,100,000 -78,800,000 -45,300,000 -46,700,000 -142,900,000 -26,300,000 104,600,000 
          net change in cash, cash equivalents and restricted cash
        -631,000,000 372,000,000 379,000,000 -1,148,000,000 1,015,000,000 -907,000,000 -75,000,000 2,116,000,000 -663,000,000 88,000,000 205,000,000 362,000,000 155,000,000 117,000,000                                         
          cash, cash equivalents and restricted cash at beginning of period
        2,137,000,000 1,519,000,000 1,048,000,000 238,000,000 13,000,000 15,000,000 15,000,000 9,000,000 76,000,000 9,000,000                      
          cash, cash equivalents and restricted cash at end of period
        1,506,000,000 372,000,000 379,000,000 -1,148,000,000 2,534,000,000 -907,000,000 -75,000,000 2,116,000,000 385,000,000 88,000,000 205,000,000 362,000,000 393,000,000 117,000,000 -177,000,000 256,000,000 42,000,000 -26,000,000 31,000,000 -16,000,000 24,000,000 -13,000,000 -39,000,000 10,000,000 57,000,000 -26,000,000 34,000,000 -86,000,000 93,000,000 37,000,000 30,000,000 3,000,000 6,000,000                      
          deferred income taxes
         6,000,000 2,000,000       4,000,000   -1,000,000 4,000,000 -1,000,000     -3,000,000 3,000,000 -2,000,000 1,000,000 2,000,000 1,000,000 4,000,000 -3,000,000 1,000,000   -1,000,000 -3,000,000 -9,000,000 -4,000,000         -400,000    
          gain on equity method investments
                                                             
          related party debt borrowings
                                                             
          related party debt repayments
                                                             
          redemption of series b preferred units
                 -600,000,000                                          
          distributions to series b preferred unitholders
                 -21,000,000 -20,000,000 -21,000,000 -20,000,000 -21,000,000 -20,000,000 -21,000,000                             
          amortization of deferred financing costs
            10,000,000 13,000,000 14,000,000 14,000,000 13,000,000 13,000,000 13,000,000 12,000,000 17,000,000 18,000,000 19,000,000 18,000,000 18,000,000 17,000,000 18,000,000 18,000,000 17,000,000 17,000,000 15,000,000 15,000,000 14,000,000 13,000,000 3,000,000 13,000,000 13,000,000 14,000,000 15,000,000 14,000,000 16,000,000 15,000,000 13,000,000 13,000,000 12,000,000 12,000,000 11,000,000 12,000,000 11,000,000              
          receivables
            -100,000,000 42,000,000 21,000,000 22,000,000 95,000,000 45,000,000 -85,000,000 16,000,000 38,000,000                                          
          current accounts payable and other current assets and liabilities
            -76,000,000 59,000,000 1,000,000                                                
          gain on sales-type leases and equity method investments
             -20,000,000                                              
          - redemptions, repayments, return of capital and sales proceeds
              4,000,000                                                
          distributions to unitholders and general partner
              -868,000,000 -864,000,000 -853,000,000 -852,000,000 -776,000,000 -776,000,000 -777,000,000 -777,000,000 -714,000,000 -714,000,000 -716,000,000 -1,306,000,000 -705,000,000 -708,000,000 -713,000,000 -722,000,000 -717,000,000 -728,000,000 -717,000,000 -704,000,000 -693,000,000 -523,000,000 -515,000,000 -507,000,000 -498,000,000 -467,000,000 -347,000,000 -320,000,000 -295,000,000 -263,000,000 -242,000,000 -233,000,000 -221,000,000 -201,000,000 -190,000,000            -13,300,000  
          assets/liabilities - related parties
               75,000,000 -46,000,000 -5,000,000 -34,000,000 79,000,000 44,000,000                                          
          right of use assets/operating lease liabilities
                -1,000,000  2,000,000 3,000,000 -1,000,000 -4,000,000   -1,000,000 -4,000,000 1,000,000 2,000,000 -1,000,000 -3,000,000 -1,000,000 3,000,000 -4,000,000 -2,000,000 3,000,000 3,000,000                          
          accounts payable and accrued liabilities
                -115,000,000 16,000,000 39,000,000 35,000,000 -130,000,000                                          
          investments in unconsolidated affiliates
                -119,000,000 -8,000,000 -13,000,000 -26,000,000 -51,000,000 -19,000,000 -42,000,000 -46,000,000 -110,000,000 -35,000,000 -32,000,000 -49,000,000 -35,000,000 -22,000,000 -22,000,000 -131,000,000 -91,000,000 -219,000,000 -184,000,000 -182,000,000 -128,000,000 -126,000,000 -103,000,000 -74,000,000 -38,000,000 -71,000,000 -50,000,000 -86,000,000 -554,000,000 -31,000,000 -17,000,000 -10,000,000 -29,000,000              
          impairment expense
                           2,165,000,000             1,000,000 129,000,000              
          distributions from unconsolidated affiliates - return of capital
                           11,000,000 2,000,000 41,000,000 69,000,000 16,000,000 2,000,000 1,000,000   2,000,000 4,000,000 20,000,000                  
          gain on sales-type leases
                                                             
          loss from equity method investments
                         -93,000,000   -70,000,000             -49,000,000    2,000,000 -6,000,000                
          long-term debt - borrowings
                     994,000,000 2,385,000,000 1,175,000,000 200,000,000 890,000,000 1,910,000,000 820,000,000 3,490,000,000 1,175,000,000 1,325,000,000 500,000,000 6,399,000,000 1,450,000,000 825,000,000 2,451,000,000 1,125,000,000 9,610,000,000 250,000,000 420,000,000 2,241,000,000 128,000,000 306,000,000 961,800,000 528,200,000 890,000,000 270,000,000      
          - repayments
                     -1,001,000,000 -1,201,000,000 -875,000,000 -1,200,000,000 -1,726,000,000 -2,020,000,000 -1,042,000,000 -3,690,000,000 -1,101,000,000 -581,000,000 -501,000,000 -5,762,000,000 -1,261,000,000 -400,000,000 -1,999,000,000 -126,000,000 -4,655,000,000 -165,000,000 -250,000,000 -1,000,000 -1,000,000 -454,000,000 -857,000,000 -1,025,300,000 -300,000 -200,000 -415,200,000 -510,300,000 -200,000 -15,200,000 -200,000      
          related party debt - borrowings
                     165,000,000 975,000,000 1,849,000,000 1,922,000,000 2,136,000,000 2,194,000,000 2,241,000,000 1,394,000,000 2,162,000,000 1,041,000,000 1,667,000,000 1,605,000,000 4,642,000,000 2,215,000,000 851,000,000 1,567,000,000 1,235,000,000 708,000,000 452,000,000 1,540,000,000 817,000,000 12,000,000 317,000,000 362,000,000 416,000,000 1,437,000,000              
          current accounts payable and accrued liabilities
                      -204,000,000 180,000,000 73,000,000 27,000,000 89,000,000 51,000,000 26,000,000 63,000,000 75,000,000 40,000,000 -142,000,000 22,000,000 -5,000,000 2,000,000 -78,000,000 -51,000,000 32,000,000 163,000,000 -44,000,000 42,000,000 22,000,000 43,000,000 -59,000,000 41,000,000 41,000,000 33,000,000 -15,000,000 -8,700,000 -1,600,000 9,300,000 5,000,000 -400,000 2,700,000 500,000 -2,300,000 -5,300,000 1,600,000 8,200,000 -7,100,000 -8,800,000 
          current assets/current liabilities - related parties
                        -112,000,000 7,000,000 -7,000,000 109,000,000 -8,000,000 -28,000,000 9,000,000 79,000,000 -52,000,000 -15,000,000 -40,000,000 39,000,000 -147,000,000                          
          net increase in cash, cash equivalents and restricted cash
                       256,000,000 29,000,000 -26,000,000   9,000,000            -3,000,000                      
          asset retirement expenditures
                                   -2,000,000 -4,000,000 -1,000,000 -1,000,000 -1,000,000 -2,000,000 -1,000,000   -300,000 -400,000 -200,000 -100,000 -600,000 -100,000 -700,000 -200,000 -4,900,000 -1,800,000 -1,200,000 -400,000  
          fair value of derivatives
                         4,000,000 2,000,000 36,000,000 3,000,000 2,000,000 10,000,000 6,000,000 -15,000,000 6,000,000 -11,000,000 7,000,000 -26,000,000   -9,000,000 9,000,000 19,000,000                    
          distributions to common and series b preferred unitholders from predecessor
                                                             
          contributions from noncontrolling interests
                                 1,000,000 94,000,000 3,000,000 3,000,000 4,000,000 1,000,000 1,000,000 2,000,000 126,000,000 2,000,000 2,000,000 2,000,000              
          increase in cash, cash equivalents and restricted cash
                                                              
          increase/(decrease) in cash, cash equivalents and restricted cash
                                                              
          net income/
                                -2,716,000,000                              
          adjustments to reconcile net income/(loss) to net cash from operating activities:
                                                              
          (income)/income from equity method investments
                                                              
          net (decrease)/increase in cash, cash equivalents and restricted cash
                                42,000,000 -26,000,000 25,000,000                            
          (decrease)/increase in cash, cash equivalents and restricted cash
                                                              
          net (loss)/income
                             700,000,000 674,000,000                                
          loss/(gain) on disposal of assets
                             3,000,000                                
          loss/(income) from equity method investments
                             -76,000,000 -83,000,000 -89,000,000 1,184,000,000                              
          distributions to mpc for acquisitions
                                     -11,000,000                        
          net increase/(decrease) in cash, cash equivalents and restricted cash
                              -39,000,000      17,000,000                          
          (gain)/loss on disposal of assets
                                                              
          gain on disposal of assets
                                          -1,000,000                  
          investments - net related party loans
                                                            
          net proceeds from equity offerings
                                         40,000,000 292,000,000 151,000,000 282,000,000 189,000,000 321,000,000 -300,000            
          distributions to mpc from predecessor
                                         -113,000,000 -104,000,000              
          consideration payment to class b unitholders
                                                            
          partnership
                                                              
          common unit-holder public
                                                              
          balance at december 31, 2016
                                                              
          unit issuances under atm program
                                                              
          class b unit conversion
                                                              
          allocation of mpc's net investment at acquisition
                                                              
          distributions to:
                                                              
          mpc from predecessor
                                                              
          mpc for acquisition
                                                              
          unitholders and general partner
                                                             
          noncontrolling interests
                                                              
          mpc of cash received from joint-interest acquisition entities
                                                              
          contributions from:
                                                              
          mpc
                                                              
          other
                                                             
          balance at december 31, 2017
                                                             
          conversion of gp economic interests
                                                              
          balance at december 31, 2018
                                                              
          conversion of series a preferred units
                                                              
          balance at december 31, 2019
                                                              
          balance at march 31, 2018
                                                             
          balance at june 30, 2018
                                                             
          balance at september 30, 2018
                                                              
          distributions to preferred unitholders
                                    -20,000,000 -19,000,000 -19,000,000 -17,000,000 -16,000,000 -16,000,000 -16,000,000 -17,000,000 -16,000,000 -16,000,000                 
          net cash (used in)/provided by financing activities
                                    -26,000,000                          
          receivables from/liabilities to related parties
                                                              
          prepaid other current assets from related parties
                                     2,000,000 1,000,000 3,000,000 1,000,000                      
          issuance of redeemable preferred units
                                                            
          receivables from / liabilities to related parties
                                      -17,000,000 31,000,000 -127,000,000 2,000,000 39,000,000 40,000,000 -18,000,000 -9,000,000 9,000,000 -17,000,000 23,000,000 -3,400,000 2,900,000 -2,400,000 -5,100,000 8,000,000 -500,000 1,400,000 6,300,000 2,000,000 5,200,000 8,700,000 3,000,000  
          distributions of cash received from joint-interest acquisition entities to mpc
                                       -11,000,000                      
          distributions to mpc for acquisition
                                        -4,100,000,000                      
          increase in cash and cash equivalents
                                                              
          issuance of units in markwest merger
                                                              
          contributions from mpc - markwest merger
                                                              
          distribution to mpc for acquisition
                                         -420,000,000 -1,511,000,000                  
          contribution from mpc
                                                             
          distributions related to purchase of additional interest in pipe line holdings
                                                     -600,000,000 -310,000,000     
          net increase in cash and cash equivalents
                                         2,000,000 -290,000,000 28,000,000 31,000,000 26,000,000 173,000,000 31,000,000 -39,000,000 -47,100,000 -40,000,000 -2,100,000 105,200,000    -13,500,000 -32,800,000 -28,400,000 -112,600,000 11,200,000 148,200,000 
          cash and cash equivalents at beginning of period
                                         234,000,000 43,000,000 -300,000 27,300,000 54,100,000 216,700,000 
          cash and cash equivalents at end of period
                                         2,000,000 -290,000,000 28,000,000 265,000,000 26,000,000 173,000,000 31,000,000 4,000,000 -47,400,000 -40,000,000 -2,100,000 132,500,000 -4,900,000 -11,000,000 2,600,000 40,600,000 -32,800,000 -28,400,000 -112,600,000 227,900,000 148,200,000 
          (income) income from equity method investments
                                                              
          investments - loans from (to) related parties
                                            80,000,000  77,000,000              
          investments - loans to (from) related parties
                                                              
          net gain on disposal of assets
                                                              
          equity in earnings from unconsolidated affiliates
                                                -5,000,000              
          net income on disposal of assets
                                                 800,000            
          materials and supplies inventories
                                                 1,100,000 100,000 -100,000 -100,000 200,000 400,000 300,000 200,000 1,200,000 1,700,000 -1,800,000  
          depreciation
                                                  12,700,000 12,700,000 12,700,000 12,700,000 12,500,000 12,400,000 12,600,000 12,600,000 12,700,000 11,900,000 11,700,000 11,600,000 
          quarterly distributions to unitholders and general partner
                                                  -41,600,000 -36,900,000 -33,100,000 -27,900,000 -26,500,000 -25,000,000 -23,700,000 -22,400,000 -21,500,000    
          quarterly distributions to noncontrolling interest retained by mpc
                                                  -200,000 -200,000 -100,000 -8,600,000 -12,500,000 -10,900,000 -14,900,000 -22,800,000 -25,000,000    
          investments - repayments of loans receivable from a related party
                                                              
          proceeds from initial public offering distributed to mpc
                                                              
          distributions to mpc
                                                              
          net decrease in cash and cash equivalents
                                                      -11,000,000        
          net loss on disposal of assets
                                                              
          investments in related party debt securities - purchases
                                                              
          - redemptions
                                                              
          investments - loans to a related party
                                                              
          - repayments of loans receivable from a related party
                                                              
          long-term debt - repayments
                                                              
          net proceeds from initial public offering
                                                              
          contributions from (distributions to) mpc
                                                             -97,200,000 
          investments-repayments of loans receivable from a related party
                                                              
          long-term debt-repayments
                                                              
          investments—loans to related party
                                                              
          long-term debt—repayments
                                                           -200,000 -200,000  
          distributions related to purchase of additional 5.0% interest in pipe line holdings
                                                              
          distributions to noncontrolling interest
                                                            -12,800,000  
          net income on sale of assets
                                                             
          materials & supplies inventories
                                                              
          receivables from / payables to related parties
                                                             31,400,000 
          investments in related party debt securities – purchases
                                                              
          – redemptions
                                                              
          investments – loans to related party
                                                              
          long-term debt – repayments
                                                              
          investments in related party debt securities—purchases
                                                              
          —redemptions