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Alcoa
(NYSE:AA) 

AA stock logo

Alcoa Corporation, together with its subsidiaries, produces and sells bauxite, alumina, and aluminum products in the United States, Spain, Australia, Brazil, Canada, and internationally. The company operates through three segments: Bauxite, Alumina, and Aluminum. It engages in bauxite mining operati...

Founded: 1888
Full Time Employees: 13,800
CEO: Roy Harvey  
Sector: Basic Materials
Industry: Aluminum

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At a glance:
  • Alcoa Highly Exposed to Aluminum Price Cyclicality: Results and outlook are heavily influenced by LME aluminum and alumina pricing, which can drive significant earnings and cash flow volatility across cycles.
  • Energy and Input Costs Are Key Profit Drivers: Power prices, fuel, caustic soda, and logistics costs materially affect margins, especially in energy-intensive smelting operations.
  • Portfolio Optimization and Cost Actions Remain Central: Management focus often centers on curtailments/restarts, operational efficiency, and reshaping the asset base to improve competitiveness and resilience in weaker pricing environments.
  • Balance Sheet and Liquidity Are Important Through the Cycle: Maintaining ample liquidity and managing debt maturities can help bridge downturns and fund sustaining capex without excessive dilution or distressed financing.
  • Regulatory and ESG Pressures Affect Long-Term Competitiveness: Decarbonization requirements, emissions compliance, and demand for low-carbon aluminum can influence capital allocation, customer mix, and potential premium opportunities.
Bull Thesis:
  • Aluminum Price Recovery & Demand Rebound: Global industrial activity, particularly a potential recovery in China and strengthening demand from sectors like automotive and renewable energy, could drive a sustained rebound in aluminum prices, directly boosting Alcoa's revenue and profitability.
  • Strategic Portfolio Optimization & Cost Efficiency: Alcoa's ongoing efforts to rationalize its asset base by curtailing or closing high-cost operations, coupled with internal efficiency improvements and lower input costs (e.g., caustic soda), are expected to enhance its overall cost structure and improve margin resilience.
  • Green Aluminum Leadership & ESG Premium: Alcoa's investments in low-carbon aluminum production technologies (e.g., ELYSIS) and its significant hydro-powered smelting capacity position it to capitalize on growing demand for sustainable materials, potentially commanding a premium and attracting ESG-focused investors.
  • Strong Balance Sheet & Capital Allocation: Despite recent challenges, Alcoa maintains a relatively healthy balance sheet. As market conditions improve, this financial strength could enable strategic investments, debt reduction, or increased shareholder returns through buybacks or dividends.
Bear Thesis:
  • Persistent Weak Aluminum Prices & Oversupply: Continued sluggish global demand, particularly in Europe and North America, coupled with potential oversupply from regions like China, could keep aluminum and alumina prices depressed, severely impacting Alcoa's revenue and profitability.
  • Elevated & Volatile Energy Costs: Aluminum smelting is highly energy-intensive. Persistent high natural gas and electricity prices, or unexpected spikes due to geopolitical events, could continue to squeeze Alcoa's margins, especially at its less efficient smelters.
  • Global Economic Slowdown & Demand Contraction: A deeper or prolonged global economic recession would significantly reduce demand for aluminum across key end-use sectors like construction, automotive, and packaging, leading to lower sales volumes and pricing pressure for Alcoa.
  • Operational Challenges & Production Disruptions: Alcoa faces inherent risks in its mining, refining, and smelting operations, including unexpected outages, labor disputes, regulatory hurdles, or technical issues, which could lead to production shortfalls and increased operational costs.
Main Competitors:
  • Rio Tinto ($RIO) (Bauxite, Alumina, Primary Aluminum), A global mining and metals giant, Rio Tinto competes with Alcoa across the upstream aluminum value chain, from bauxite mining and alumina refining to primary aluminum smelting. Their vast scale, diversified operations, and strong presence in key bauxite-producing regions (like Australia) make them a formidable competitor in raw material supply and primary metal production.
  • Rusal (United Company Rusal) ($RUAL.ME) (Primary Aluminum, Alumina), One of the world's largest producers of primary aluminum and alumina, Rusal directly competes with Alcoa in the global commodity markets for these materials. Their significant production capacity, particularly in primary aluminum, and focus on cost efficiency, position them as a major price influencer and competitor for market share.
  • Chalco (Aluminum Corporation of China Limited) ($ACH) (Bauxite, Alumina, Primary Aluminum, Fabricated Aluminum Products), As a dominant state-owned enterprise in China, Chalco is a fully integrated aluminum producer, competing with Alcoa across the entire value chain. Its massive production scale, access to domestic resources, and significant market share within China and globally, often supported by state policies, make it a powerful competitor influencing global supply and demand dynamics.
  • Norsk Hydro ASA ($NHYDY) (Bauxite, Alumina, Primary Aluminum, Rolled & Extruded Products), An integrated aluminum company with a strong focus on sustainability and renewable energy, Norsk Hydro competes with Alcoa in bauxite, alumina, and primary aluminum production. Additionally, its significant downstream operations in rolled and extruded products mean it competes for customers seeking value-added aluminum solutions, often emphasizing low-carbon aluminum.
Moat:
Alcoa operates in a highly competitive global aluminum market, where its primary moat stems from its integrated operations, significant scale in bauxite mining, alumina refining, and primary aluminum smelting, and a long-standing expertise in the industry. Its strategic focus on optimizing its asset portfolio and developing lower-carbon aluminum technologies (like ELYSIS) also contributes to its competitive edge. However, competition is intense due to the commodity nature of aluminum, making prices highly susceptible to global supply-demand imbalances and LME fluctuations. Key competitive pressures arise from large, often state-backed, producers with cost advantages (e.g., access to cheap energy or raw materials), particularly from China, as well as other global integrated players who vie for market share in both upstream raw materials and primary metal production.
Income Statements:
Quarterly
Annual
    Unit: USD2026-03-31 2025-09-30 2025-06-30 2025-03-31 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 
                                         
      total sales
    3,193,000,000 2,995,000,000 3,018,000,000 3,369,000,000 2,904,000,000 2,906,000,000 2,599,000,000 2,595,000,000 2,602,000,000 2,684,000,000 2,670,000,000 2,663,000,000 2,851,000,000 3,644,000,000 3,293,000,000 3,340,000,000 3,109,000,000 2,833,000,000 2,870,000,000 2,392,000,000 2,365,000,000 2,148,000,000 2,381,000,000 2,436,000,000 2,567,000,000 2,711,000,000 2,719,000,000 3,344,000,000 3,390,000,000 3,579,000,000 3,090,000,000 3,174,000,000 2,964,000,000 2,859,000,000 2,655,000,000 2,537,000,000 2,329,000,000 
      yoy
    9.95% 3.06% 16.12% 29.83% 11.61% 8.27% -2.66% -2.55% -8.73% -26.34% -18.92% -20.27% -8.30% 28.63% 14.74% 39.63% 31.46% 31.89% 20.54% -1.81% -7.87% -20.77% -12.43% -27.15% -24.28% -24.25% -12.01% 5.36% 14.37% 25.18% 16.38% 25.11% 27.26%     
      qoq
    6.61% -0.76% -10.42% 16.01% -0.07% 11.81% 0.15% -0.27% -3.06% 0.52% 0.26% -6.59% -21.76% 10.66% -1.41% 7.43% 9.74% -1.29% 19.98% 1.14% 10.10% -9.79% -2.26% -5.10% -5.31% -0.29% -18.69% -1.36% -5.28% 15.83% -2.65% 7.09% 3.67% 7.68% 4.65% 8.93%  
      cost of goods sold
    2,512,000,000 2,695,000,000 2,652,000,000 2,438,000,000 2,393,000,000 2,533,000,000 2,404,000,000 2,425,000,000 2,469,000,000 2,515,000,000 2,404,000,000 2,596,000,000 2,668,000,000 2,767,000,000 2,181,000,000 2,383,000,000 2,322,000,000 2,156,000,000 2,292,000,000 1,974,000,000 2,038,000,000 1,932,000,000 2,025,000,000 2,048,000,000 2,120,000,000 2,189,000,000 2,180,000,000 2,534,000,000 2,534,000,000 2,632,000,000 2,381,000,000 2,359,000,000 2,361,000,000 2,309,000,000 2,043,000,000 2,137,000,000 1,964,000,000 
      gross profit
    681,000,000 300,000,000 366,000,000 931,000,000 511,000,000 373,000,000 195,000,000 170,000,000 133,000,000 169,000,000 266,000,000 67,000,000 183,000,000 877,000,000 1,112,000,000 957,000,000 787,000,000 677,000,000 578,000,000 418,000,000 327,000,000 216,000,000 356,000,000 388,000,000 447,000,000 522,000,000 539,000,000 810,000,000 856,000,000 947,000,000 709,000,000 815,000,000 603,000,000 550,000,000 612,000,000 400,000,000 365,000,000 
      yoy
    33.27% -19.57% 87.69% 447.65% 284.21% 120.71% -26.69% 153.73% -27.32% -80.73% -76.08% -93.00% -76.75% 29.54% 92.39% 128.95% 140.67% 213.43% 62.36% 7.73% -26.85% -58.62% -33.95% -52.10% -47.78% -44.88% -23.98% -0.61% 41.96% 72.18% 15.85% 103.75% 65.21%     
      qoq
    127.00% -18.03% -60.69% 82.19% 37.00% 91.28% 14.71% 27.82% -21.30% -36.47% 297.01% -63.39% -79.13% -21.13% 16.20% 21.60% 16.25% 17.13% 38.28% 27.83% 51.39% -39.33% -8.25% -13.20% -14.37% -3.15% -33.46% -5.37% -9.61% 33.57% -13.01% 35.16% 9.64% -10.13% 53.00% 9.59%  
      gross margin %
    21.33% 10.02% 12.13% 27.63% 17.60% 12.84% 7.50% 6.55% 5.11% 6.30% 9.96% 2.52% 6.42% 24.07% 33.77% 28.65% 25.31% 23.90% 20.14% 17.47% 13.83% 10.06% 14.95% 15.93% 17.41% 19.25% 19.82% 24.22% 25.25% 26.46% 22.94% 25.68% 20.34% 19.24% 23.05% 15.77% 15.67% 
      selling, general administrative, and other expenses
    83,000,000 78,000,000 82,000,000 71,000,000 66,000,000 69,000,000 60,000,000 64,000,000 56,000,000 52,000,000 54,000,000 64,000,000 44,000,000 52,000,000 44,000,000 68,000,000 53,000,000 54,000,000 52,000,000 55,000,000 47,000,000 44,000,000 60,000,000 62,000,000 66,000,000 68,000,000 84,000,000 59,000,000 58,000,000 64,000,000 67,000,000 70,000,000 70,000,000 72,000,000 72,000,000 92,000,000 92,000,000 
      research and development expenses
    10,000,000 11,000,000 12,000,000 12,000,000 16,000,000 13,000,000 11,000,000 14,000,000 9,000,000 6,000,000 10,000,000 9,000,000 7,000,000 7,000,000 9,000,000 10,000,000 8,000,000 6,000,000 7,000,000 9,000,000 6,000,000 5,000,000 7,000,000 6,000,000 7,000,000 7,000,000 7,000,000 7,000,000 7,000,000 9,000,000 8,000,000 9,000,000 8,000,000 8,000,000 7,000,000 7,000,000 8,000,000 
      provision for depreciation, depletion, and amortization
    162,000,000 160,000,000 153,000,000 148,000,000 159,000,000 163,000,000 161,000,000 163,000,000 163,000,000 153,000,000 153,000,000 147,000,000 149,000,000 161,000,000 160,000,000 124,750,000 156,000,000 161,000,000 182,000,000 120,750,000 161,000,000 152,000,000 170,000,000 132,500,000 184,000,000 174,000,000 172,000,000 139,750,000 173,000,000 192,000,000 194,000,000 187,000,000 194,000,000 190,000,000 179,000,000 182,000,000 181,000,000 
      restructuring and other charges
    18,000,000 885,000,000 14,000,000 5,000,000 30,000,000 18,000,000 202,000,000 -11,000,000 22,000,000 24,000,000 149,000,000 -6,000,000 652,000,000 -75,000,000 125,000,000 1,055,000,000 33,000,000 33,000,000 7,000,000 60,000,000 5,000,000 37,000,000 2,000,000 363,000,000 185,000,000 370,000,000 113,000,000 138,000,000 177,000,000 231,000,000 -19,000,000 297,000,000 -10,000,000 12,000,000 10,000,000 209,000,000 17,000,000 
      interest expense
    35,000,000 33,000,000 56,000,000 53,000,000 44,000,000 40,000,000 27,000,000 28,000,000 26,000,000 27,000,000 26,000,000 26,000,000 25,000,000 30,000,000 25,000,000 28,000,000 58,000,000 67,000,000 42,000,000 43,000,000 41,000,000 32,000,000 30,000,000 31,000,000 30,000,000 30,000,000 30,000,000 31,000,000 33,000,000 32,000,000 26,000,000 27,000,000 26,000,000 25,000,000 26,000,000 46,000,000 67,000,000 
      other incomes
    -126,000,000             -206,000,000 -14,000,000    -24,000,000                   
      total costs and expenses
    2,694,000,000 2,828,000,000 2,857,000,000 2,701,000,000 2,720,000,000 2,814,000,000 2,924,000,000 2,672,000,000 2,830,000,000 2,783,000,000 2,850,000,000 2,903,000,000 3,580,000,000 2,736,000,000 2,530,000,000 3,411,000,000 2,612,000,000 2,372,000,000 2,558,000,000 2,355,000,000 2,343,000,000 2,253,000,000 2,162,000,000 2,737,000,000 2,619,000,000 2,888,000,000 2,627,000,000 2,975,000,000 2,984,000,000 3,169,000,000 2,678,000,000 2,958,000,000 2,676,000,000 2,622,000,000 2,237,000,000 2,674,000,000 2,223,000,000 
      income before income taxes
    499,000,000 167,000,000 161,000,000 668,000,000 184,000,000 92,000,000 -325,000,000 -77,000,000 -228,000,000 -99,000,000 -180,000,000 -240,000,000 -729,000,000 908,000,000 763,000,000 -71,000,000 497,000,000 461,000,000 312,000,000 37,000,000 22,000,000 -105,000,000 219,000,000 -301,000,000 -52,000,000 -177,000,000 92,000,000 369,000,000 406,000,000 410,000,000 412,000,000 216,000,000 288,000,000 237,000,000 418,000,000 -137,000,000 106,000,000 
      provision for income taxes
    82,000,000 -51,000,000 10,000,000 120,000,000 86,000,000 61,000,000 -18,000,000 150,000,000 -35,000,000 22,000,000 52,000,000 180,000,000 40,000,000 234,000,000 210,000,000 82,750,000 127,000,000 111,000,000 93,000,000 41,750,000 42,000,000 45,000,000 80,000,000 90,250,000 95,000,000 116,000,000 150,000,000 142,250,000 251,000,000 180,000,000 138,000,000 272,000,000 119,000,000 99,000,000 110,000,000 6,000,000 92,000,000 
      net income
    417,000,000 218,000,000 151,000,000 548,000,000 98,000,000 31,000,000 -307,000,000 -227,000,000 -193,000,000 -121,000,000 -232,000,000 -420,000,000 -769,000,000 674,000,000 553,000,000 -369,000,000 370,000,000 350,000,000 219,000,000 17,000,000 -20,000,000 -150,000,000 139,000,000 -355,000,000 -147,000,000 -293,000,000 -58,000,000 212,000,000 155,000,000 230,000,000 274,000,000 -56,000,000 169,000,000 138,000,000 308,000,000 -143,000,000 14,000,000 
      yoy
    325.51% 603.23% -149.19% -341.41% -150.78% -125.62% 32.33% -45.95% -74.90% -117.95% -141.95% 13.82% -307.84% 92.57% 152.51% -2270.59% -1950.00% -333.33% 57.55% -104.79% -86.39% -48.81% -339.66% -267.45% -194.84% -227.39% -121.17% -478.57% -8.28% 66.67% -11.04% -60.84% 1107.14%     
      qoq
    91.28% 44.37% -72.45% 459.18% 216.13% -110.10% 35.24% 17.62% 59.50% -47.84% -44.76% -45.38% -214.09% 21.88% -249.86% -199.73% 5.71% 59.82% 1188.24% -185.00% -86.67% -207.91% -139.15% 141.50% -49.83% 405.17% -127.36% 36.77% -32.61% -16.06% -589.29% -133.14% 22.46% -55.19% -315.38% -1121.43%  
      net income margin %
    13.06% 7.28% 5.00% 16.27% 3.37% 1.07% -11.81% -8.75% -7.42% -4.51% -8.69% -15.77% -26.97% 18.50% 16.79% -11.05% 11.90% 12.35% 7.63% 0.71% -0.85% -6.98% 5.84% -14.57% -5.73% -10.81% -2.13% 6.34% 4.57% 6.43% 8.87% -1.76% 5.70% 4.83% 11.60% -5.64% 0.60% 
      less: net loss attributable to noncontrolling interest
    -8,000,000      -55,000,000                               
      net income attributable to alcoa corporation
    425,000,000 232,000,000 164,000,000 548,000,000 90,000,000 20,000,000  -150,000,000 -168,000,000 -102,000,000 -231,000,000 -395,000,000 -746,000,000 549,000,000 469,000,000 -392,000,000 337,000,000 309,000,000 175,000,000    80,000,000 -303,000,000 -221,000,000 -402,000,000 -199,000,000 43,000,000 -41,000,000 75,000,000 150,000,000 -196,000,000 113,000,000 75,000,000 225,000,000   
      earnings per share attributable to alcoa corporation common shareholders
                                         
      basic
    1.61 0.88 0.63 2.08 0.39 0.11 -1.41 -0.84 -0.94 -0.57 -1.3 -2.18 -4.17 3.01 2.54 -2.1 1.8 1.66 0.94 -0.02 -0.26 -1.06 0.43 -1.64 -1.19 -2.17 -1.07 0.23 -0.22 0.4 0.81 -1.06 0.61 0.41 1.23   
      diluted
    1.6 0.88 0.62 2.07 0.38 0.11 -1.41 -0.84 -0.94 -0.57 -1.3 -2.15 -4.17 2.95 2.49 -2.06 1.76 1.63 0.93 -0.02 -0.26 -1.06 0.43 -1.64 -1.19 -2.17 -1.07 0.23 -0.22 0.39 0.8 -1.05 0.6 0.4 1.21   
      other expenses
     -1,034,000,000 -112,000,000 -26,000,000 12,000,000 -22,000,000 59,000,000 -11,000,000 85,000,000 6,000,000 54,000,000     -36,750,000 -18,000,000 -105,000,000  -9,000,000 45,000,000 51,000,000 -132,000,000 29,500,000 27,000,000 50,000,000 41,000,000 8,000,000 2,000,000 9,000,000 21,000,000 9,000,000 27,000,000 6,000,000 -100,000,000 1,000,000 -106,000,000 
      less: net income attributable to noncontrolling interest
     -14,000,000 -13,000,000  8,000,000 11,000,000  -77,000,000 -25,000,000 -19,000,000 -1,000,000 -25,000,000 -23,000,000 125,000,000 84,000,000 23,000,000 33,000,000 41,000,000 44,000,000 21,000,000 29,000,000 47,000,000 59,000,000 -52,000,000 74,000,000 109,000,000 141,000,000 169,000,000 196,000,000 155,000,000 124,000,000 140,000,000 56,000,000 63,000,000 83,000,000 -4,000,000 20,000,000 
      net loss attributable to alcoa corporation
          -252,000,000             -41,500,000 -49,000,000 -197,000,000              -139,000,000 -6,000,000 
      other expense
               -46,250,000 35,000,000                         
      sales to unrelated parties
                                   2,951,000,000 2,725,000,000 2,650,000,000 2,462,000,000 2,332,000,000 2,075,000,000 
      sales to related parties
                                   223,000,000 239,000,000 209,000,000 193,000,000 205,000,000 254,000,000 
      pro forma earnings per share attributable to alcoa corporation common shareholders
                                         
      basic
                                       -0.358 -0.04 
      diluted
                                       -0.358 -0.04 
    Balance Sheets:
    Quarterly
    Annual
      Unit: USD2026-03-31 2025-09-30 2025-06-30 2025-03-31 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 
                                           
        assets
                                           
        current assets:
                                           
        cash and cash equivalents
      1,353,000,000 1,485,000,000 1,514,000,000 1,202,000,000 1,313,000,000 1,396,000,000 1,358,000,000 944,000,000 926,000,000 990,000,000 1,138,000,000 1,363,000,000 1,432,000,000 1,638,000,000 1,554,000,000 1,814,000,000 1,452,000,000 1,652,000,000 2,544,000,000 1,607,000,000 1,736,000,000 965,000,000 829,000,000 879,000,000 841,000,000 834,000,000 1,017,000,000 1,113,000,000 1,022,000,000 1,089,000,000 1,196,000,000 1,358,000,000 1,119,000,000 954,000,000 804,000,000 853,000,000 241,000,000 
        receivables from customers
      1,192,000,000 1,045,000,000 979,000,000 1,203,000,000 862,000,000 939,000,000 869,000,000 656,000,000 691,000,000 702,000,000 753,000,000 778,000,000 749,000,000 898,000,000 952,000,000 757,000,000 769,000,000 644,000,000 587,000,000 471,000,000 516,000,000 402,000,000 570,000,000 546,000,000 596,000,000 684,000,000 758,000,000 830,000,000 1,017,000,000 1,025,000,000 814,000,000 811,000,000 840,000,000 789,000,000 708,000,000 668,000,000 530,000,000 
        other receivables
      209,000,000 149,000,000 225,000,000 144,000,000 145,000,000 135,000,000 132,000,000 152,000,000 105,000,000 104,000,000 99,000,000 131,000,000 119,000,000 124,000,000 98,000,000 127,000,000 92,000,000 100,000,000 90,000,000 85,000,000 95,000,000 105,000,000 95,000,000 114,000,000 228,000,000 203,000,000 184,000,000 173,000,000 176,000,000 170,000,000 187,000,000 232,000,000 193,000,000 206,000,000 174,000,000 166,000,000 162,000,000 
        inventories
      2,297,000,000 2,191,000,000 2,220,000,000 2,182,000,000 2,096,000,000 1,975,000,000 2,048,000,000 2,158,000,000 2,190,000,000 2,400,000,000 2,395,000,000 2,427,000,000 2,400,000,000 2,556,000,000 2,495,000,000 1,956,000,000 1,702,000,000 1,547,000,000 1,417,000,000 1,398,000,000 1,398,000,000 1,419,000,000 1,509,000,000 1,644,000,000 1,649,000,000 1,767,000,000 1,799,000,000 1,644,000,000 1,666,000,000 1,668,000,000 1,630,000,000 1,453,000,000 1,323,000,000 1,287,000,000 1,294,000,000 1,160,000,000 1,192,000,000 
        fair value of derivative instruments
      122,000,000 44,000,000 73,000,000 38,000,000 5,000,000 38,000,000 22,000,000 29,000,000 33,000,000 93,000,000 106,000,000 134,000,000 207,000,000 224,000,000 64,000,000 14,000,000 19,000,000 25,000,000 15,000,000 21,000,000 11,000,000 24,000,000 53,000,000 59,000,000 84,000,000 80,000,000 71,000,000 73,000,000 57,000,000 46,000,000        
        prepaid expenses and other current assets
      505,000,000 370,000,000 388,000,000 438,000,000 445,000,000 420,000,000 452,000,000 466,000,000 420,000,000 381,000,000 455,000,000 417,000,000 443,000,000 423,000,000 435,000,000 358,000,000 251,000,000 233,000,000 238,000,000 290,000,000 297,000,000 264,000,000 277,000,000 288,000,000 245,000,000 250,000,000 285,000,000 301,000,000 255,000,000 283,000,000 270,000,000 271,000,000 217,000,000 347,000,000 424,000,000 334,000,000 269,000,000 
        total current assets
      5,678,000,000 5,284,000,000 5,399,000,000 5,207,000,000 4,866,000,000 4,903,000,000 4,881,000,000 4,405,000,000 4,365,000,000 4,670,000,000 4,946,000,000 5,250,000,000 5,350,000,000 5,863,000,000 5,598,000,000 5,026,000,000 4,285,000,000 4,201,000,000 4,891,000,000 4,520,000,000 4,053,000,000 3,179,000,000 3,333,000,000 3,530,000,000 3,643,000,000 3,818,000,000 4,114,000,000 4,134,000,000 4,193,000,000 4,281,000,000 4,149,000,000 4,238,000,000 3,804,000,000 3,583,000,000 3,404,000,000 3,181,000,000 3,622,000,000 
        properties, plants, and equipment
      21,045,000,000 20,800,000,000 20,413,000,000 19,982,000,000 20,535,000,000 19,999,000,000 19,959,000,000 6,785,000,000 19,836,000,000 19,814,000,000 19,649,000,000 6,493,000,000 19,019,000,000 19,647,000,000 20,445,000,000 6,623,000,000 20,111,000,000 20,551,000,000 20,199,000,000 7,190,000,000 21,061,000,000 20,877,000,000 20,181,000,000 7,916,000,000 21,456,000,000 22,126,000,000 22,015,000,000 8,327,000,000 21,839,000,000 22,079,000,000 22,837,000,000 9,138,000,000 23,253,000,000 22,971,000,000 23,076,000,000 9,325,000,000 23,145,000,000 
        less: accumulated depreciation, depletion, and amortization
      14,184,000,000 14,171,000,000 13,742,000,000 13,485,000,000 13,814,000,000 13,496,000,000 13,382,000,000  13,304,000,000 13,369,000,000 13,223,000,000  12,765,000,000 13,190,000,000 13,621,000,000  13,432,000,000 13,575,000,000 13,269,000,000  13,811,000,000 13,588,000,000 13,021,000,000  13,527,000,000 13,853,000,000 13,687,000,000  13,484,000,000 13,523,000,000 13,803,000,000  13,971,000,000 13,734,000,000 13,642,000,000  13,536,000,000 
        investments
      491,000,000 480,000,000 1,016,000,000 1,011,000,000 982,000,000 989,000,000 969,000,000 979,000,000 1,004,000,000 1,034,000,000 1,051,000,000 1,122,000,000 1,223,000,000 1,238,000,000 1,224,000,000 1,199,000,000 1,146,000,000 1,113,000,000 1,055,000,000 1,051,000,000 1,034,000,000 1,037,000,000 1,059,000,000 1,113,000,000 1,114,000,000 1,141,000,000 1,362,000,000 1,360,000,000 1,381,000,000 1,390,000,000 1,413,000,000 1,410,000,000 1,408,000,000 1,378,000,000 1,393,000,000 1,358,000,000 1,362,000,000 
        noncurrent marketable securities
      1,485,000,000 1,467,000,000                                    
        deferred income taxes
      663,000,000 524,000,000 317,000,000 306,000,000 329,000,000 311,000,000 295,000,000 333,000,000 395,000,000 320,000,000 340,000,000 296,000,000 417,000,000 445,000,000 667,000,000 506,000,000 698,000,000 729,000,000 653,000,000 655,000,000 540,000,000 482,000,000 425,000,000 642,000,000 560,000,000 599,000,000 604,000,000 560,000,000 599,000,000 612,000,000 700,000,000 814,000,000 862,000,000 784,000,000 814,000,000 741,000,000 753,000,000 
        other noncurrent assets
      1,420,000,000 1,538,000,000 1,528,000,000 1,542,000,000 1,643,000,000 1,601,000,000 1,605,000,000 1,650,000,000 1,618,000,000 1,654,000,000 1,605,000,000 1,593,000,000 1,621,000,000 1,691,000,000 1,655,000,000 1,664,000,000 1,387,000,000 1,416,000,000 1,402,000,000 1,444,000,000 1,372,000,000 1,308,000,000 1,228,000,000 1,412,000,000 1,377,000,000 1,463,000,000 1,480,000,000 1,475,000,000 1,615,000,000 1,635,000,000 1,701,000,000 1,719,000,000 1,745,000,000 1,688,000,000 1,674,000,000 1,668,000,000 1,534,000,000 
        total assets
      16,640,000,000 15,969,000,000 14,990,000,000 14,574,000,000 14,542,000,000 14,307,000,000 14,328,000,000 14,155,000,000 13,917,000,000 14,128,000,000 14,369,000,000 14,756,000,000 14,885,000,000 15,709,000,000 15,988,000,000 15,025,000,000 14,197,000,000 14,438,000,000 14,931,000,000 14,860,000,000 14,250,000,000 13,300,000,000 13,651,000,000 14,631,000,000 14,670,000,000 15,349,000,000 15,956,000,000 15,938,000,000 16,185,000,000 16,518,000,000 17,096,000,000 17,447,000,000 17,254,000,000 16,929,000,000 17,076,000,000 16,741,000,000 17,305,000,000 
        liabilities
                                           
        current liabilities:
                                           
        accounts payable, trade
      1,771,000,000 1,618,000,000 1,633,000,000 1,629,000,000 1,544,000,000 1,619,000,000 1,586,000,000 1,714,000,000 1,472,000,000 1,491,000,000 1,489,000,000 1,757,000,000 1,590,000,000 1,752,000,000 1,645,000,000 1,674,000,000 1,482,000,000 1,392,000,000 1,284,000,000 1,403,000,000 1,360,000,000 1,253,000,000 1,276,000,000 1,484,000,000 1,418,000,000 1,523,000,000 1,503,000,000 1,663,000,000 1,711,000,000 1,752,000,000 1,813,000,000 1,898,000,000 1,618,000,000 1,508,000,000 1,434,000,000 1,455,000,000 1,252,000,000 
        accrued compensation and retirement costs
      349,000,000 370,000,000 354,000,000 318,000,000 363,000,000 358,000,000 331,000,000 357,000,000 337,000,000 340,000,000 332,000,000 335,000,000 329,000,000 341,000,000 357,000,000 383,000,000 378,000,000 378,000,000 365,000,000 395,000,000 408,000,000 393,000,000 353,000,000 413,000,000 404,000,000 409,000,000 383,000,000 400,000,000 420,000,000 421,000,000 416,000,000 459,000,000 450,000,000 445,000,000 425,000,000 456,000,000 433,000,000 
        taxes, including income taxes
      310,000,000 339,000,000 246,000,000 94,000,000 109,000,000 119,000,000 94,000,000 88,000,000 110,000,000 67,000,000 207,000,000 230,000,000 301,000,000 343,000,000 358,000,000 374,000,000 218,000,000 126,000,000 92,000,000 91,000,000 57,000,000 96,000,000 78,000,000 104,000,000 81,000,000 100,000,000 395,000,000 426,000,000 417,000,000 323,000,000 325,000,000 282,000,000 166,000,000 144,000,000 176,000,000 147,000,000 110,000,000 
        other current liabilities
      828,000,000 730,000,000 678,000,000 665,000,000 712,000,000 740,000,000 746,000,000 578,000,000 500,000,000 532,000,000 543,000,000 481,000,000 566,000,000 567,000,000 591,000,000 517,000,000 551,000,000 538,000,000 554,000,000 525,000,000 415,000,000 451,000,000 435,000,000 494,000,000 484,000,000 427,000,000 437,000,000 347,000,000 319,000,000 353,000,000 294,000,000 412,000,000 376,000,000 492,000,000 568,000,000 742,000,000 390,000,000 
        long-term debt due within one year
      1,000,000  75,000,000 75,000,000 464,000,000 79,000,000 79,000,000 79,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 745,000,000 2,000,000 2,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 4,000,000 13,000,000 15,000,000 16,000,000 17,000,000 19,000,000 20,000,000 21,000,000 21,000,000 
        total current liabilities
      3,826,000,000 3,386,000,000 3,272,000,000 3,039,000,000 3,459,000,000 3,166,000,000 3,041,000,000 3,030,000,000 2,624,000,000 2,596,000,000 2,785,000,000 3,004,000,000 2,954,000,000 3,236,000,000 3,466,000,000 3,223,000,000 2,929,000,000 2,671,000,000 3,221,000,000 2,761,000,000 2,303,000,000 2,241,000,000 2,223,000,000 2,563,000,000 2,455,000,000 2,531,000,000 2,803,000,000 2,919,000,000 3,004,000,000 3,013,000,000 2,976,000,000 3,252,000,000 2,766,000,000 2,608,000,000 2,623,000,000 2,821,000,000 2,206,000,000 
        long-term debt, less amount due within one year
      2,441,000,000 2,578,000,000 2,574,000,000 2,573,000,000 2,469,000,000 2,469,000,000 2,469,000,000 1,732,000,000 1,809,000,000 1,808,000,000 1,806,000,000 1,806,000,000 1,725,000,000 1,725,000,000 1,727,000,000 1,726,000,000 1,724,000,000 2,216,000,000 2,214,000,000 2,463,000,000 2,538,000,000 1,800,000,000 1,801,000,000 1,799,000,000 1,805,000,000 1,804,000,000 1,802,000,000 1,801,000,000 1,820,000,000 1,916,000,000 1,445,000,000 1,388,000,000 1,384,000,000 1,418,000,000 1,431,000,000 1,424,000,000 1,457,000,000 
        accrued pension benefits
      248,000,000 227,000,000 235,000,000 239,000,000 258,000,000 264,000,000 267,000,000 278,000,000 225,000,000 242,000,000 207,000,000 213,000,000 370,000,000 369,000,000 407,000,000 417,000,000 633,000,000 682,000,000 1,393,000,000 1,492,000,000 1,566,000,000 1,602,000,000 1,455,000,000 1,505,000,000 1,389,000,000 1,388,000,000 1,387,000,000 1,407,000,000 1,210,000,000 1,580,000,000 2,218,000,000 2,341,000,000 1,703,000,000 1,748,000,000 1,813,000,000 1,851,000,000 1,580,000,000 
        accrued other postretirement benefits
      421,000,000 391,000,000 397,000,000 406,000,000 422,000,000 427,000,000 437,000,000 443,000,000 440,000,000 445,000,000 472,000,000 480,000,000 616,000,000 626,000,000 642,000,000 650,000,000 652,000,000 661,000,000 671,000,000 744,000,000 770,000,000 711,000,000 729,000,000 749,000,000 820,000,000 835,000,000 851,000,000 868,000,000 926,000,000 1,025,000,000 1,075,000,000 1,100,000,000 1,076,000,000 1,094,000,000 1,154,000,000 1,166,000,000 1,221,000,000 
        asset retirement obligations
      1,094,000,000 1,207,000,000 688,000,000 683,000,000 789,000,000 699,000,000 718,000,000 772,000,000 830,000,000 717,000,000 722,000,000 711,000,000 611,000,000 634,000,000 637,000,000 622,000,000 554,000,000 584,000,000 596,000,000 625,000,000 553,000,000 565,000,000 548,000,000 606,000,000 491,000,000 529,000,000 543,000,000 529,000,000 528,000,000 560,000,000 631,000,000 617,000,000 627,000,000 632,000,000 635,000,000 604,000,000 549,000,000 
        environmental remediation
      203,000,000 205,000,000 185,000,000 169,000,000 182,000,000 191,000,000 197,000,000 202,000,000 225,000,000 215,000,000 230,000,000 226,000,000 262,000,000 254,000,000 264,000,000 265,000,000 260,000,000 262,000,000 278,000,000 293,000,000 289,000,000 277,000,000 289,000,000 296,000,000 238,000,000 237,000,000 243,000,000 236,000,000 248,000,000 237,000,000 234,000,000 258,000,000 270,000,000 266,000,000 263,000,000 264,000,000 201,000,000 
        noncurrent income taxes
      87,000,000 109,000,000 79,000,000 53,000,000 74,000,000 133,000,000 134,000,000 193,000,000 207,000,000 221,000,000 208,000,000 215,000,000 201,000,000 204,000,000 192,000,000 191,000,000 182,000,000 191,000,000 204,000,000 209,000,000 244,000,000 245,000,000 299,000,000 276,000,000 299,000,000 320,000,000 300,000,000 301,000,000 297,000,000 256,000,000 285,000,000 309,000,000 318,000,000 348,000,000 352,000,000 310,000,000 351,000,000 
        other noncurrent liabilities and deferred credits
      513,000,000 506,000,000 463,000,000 644,000,000 632,000,000 591,000,000 606,000,000 568,000,000 538,000,000 514,000,000 527,000,000 486,000,000 442,000,000 502,000,000 601,000,000 599,000,000 524,000,000 550,000,000 558,000,000 515,000,000 493,000,000 332,000,000 332,000,000 370,000,000 338,000,000 340,000,000 364,000,000 222,000,000 237,000,000 243,000,000 249,000,000 279,000,000 303,000,000 616,000,000 642,000,000 604,000,000 614,000,000 
        total liabilities
      9,749,000,000 9,538,000,000 8,755,000,000 8,656,000,000 9,292,000,000 8,891,000,000 8,794,000,000 8,310,000,000 7,825,000,000 7,670,000,000 8,073,000,000 8,167,000,000 7,993,000,000 8,417,000,000 9,731,000,000 8,741,000,000 8,736,000,000 9,020,000,000 10,058,000,000 9,844,000,000 9,231,000,000 7,976,000,000 7,840,000,000 8,745,000,000 8,260,000,000 8,490,000,000 8,873,000,000 8,544,000,000 8,900,000,000 9,410,000,000 9,579,000,000 10,649,000,000 9,136,000,000 8,730,000,000 8,913,000,000 9,044,000,000 8,179,000,000 
        contingencies and commitments
                                           
        mezzanine equity
                                           
        noncontrolling interest
      65,000,000 86,000,000 100,000,000 103,000,000  1,517,000,000 1,540,000,000 1,594,000,000 1,583,000,000 1,616,000,000 1,606,000,000 1,513,000,000 1,521,000,000 1,626,000,000 1,678,000,000 1,612,000,000 1,583,000,000 1,649,000,000 1,625,000,000 1,705,000,000 1,624,000,000 1,619,000,000 1,536,000,000 1,774,000,000 1,871,000,000 1,964,000,000 1,926,000,000 2,005,000,000 2,069,000,000 2,084,000,000 2,149,000,000 2,275,000,000 2,256,000,000 2,245,000,000 2,287,000,000 2,043,000,000 2,146,000,000 
        equity
                                           
        common stock
      3,000,000 3,000,000 3,000,000 3,000,000 3,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000  
        additional capital
      11,577,000,000 11,570,000,000 11,560,000,000 11,548,000,000 11,487,000,000 9,196,000,000 9,184,000,000 9,187,000,000 9,179,000,000 9,173,000,000 9,162,000,000 9,183,000,000 9,171,000,000 9,313,000,000 9,537,000,000 9,577,000,000 9,708,000,000 9,695,000,000 9,674,000,000 9,663,000,000 9,661,000,000 9,655,000,000 9,647,000,000 9,639,000,000 9,638,000,000 9,629,000,000 9,618,000,000 9,611,000,000 9,656,000,000 9,650,000,000 9,633,000,000 9,590,000,000 9,584,000,000 9,559,000,000 9,553,000,000 9,531,000,000  
        retained earnings
      127,000,000             606,000,000 114,000,000  96,000,000          371,000,000 341,000,000 298,000,000 339,000,000 263,000,000 113,000,000 309,000,000 196,000,000 121,000,000   
        accumulated other comprehensive loss
      -4,881,000,000 -4,770,000,000 -4,764,000,000 -4,935,000,000 -4,742,000,000 -3,737,000,000 -3,628,000,000 -3,645,000,000 -3,547,000,000 -3,394,000,000 -3,655,000,000 -3,539,000,000 -3,644,000,000 -4,255,000,000 -5,074,000,000 -4,592,000,000 -5,928,000,000 -5,687,000,000 -5,878,000,000 -5,629,000,000 -5,547,000,000 -5,280,000,000 -4,898,000,000 -4,974,000,000 -4,849,000,000 -4,705,000,000 -4,834,000,000 -4,565,000,000 -4,740,000,000 -4,967,000,000 -4,530,000,000 -5,182,000,000 -4,033,000,000 -3,803,000,000 -3,800,000,000 -3,775,000,000 -4,478,000,000 
        total equity
      6,826,000,000 6,345,000,000 6,135,000,000 5,815,000,000 5,250,000,000 5,416,000,000 5,534,000,000 5,845,000,000 6,092,000,000 6,458,000,000 6,296,000,000 6,589,000,000 6,892,000,000 7,292,000,000 6,257,000,000 6,284,000,000 5,461,000,000 5,418,000,000 4,873,000,000 5,016,000,000 5,019,000,000 5,324,000,000 5,811,000,000 5,886,000,000 6,410,000,000 6,859,000,000 7,083,000,000 7,394,000,000 7,285,000,000 7,108,000,000 7,517,000,000 6,798,000,000 8,118,000,000 8,199,000,000 8,163,000,000 7,697,000,000 9,126,000,000 
        total liabilities, mezzanine equity, and equity
      16,640,000,000 15,969,000,000 14,990,000,000 14,574,000,000                                  
        preferred stock
                                           
        accumulated deficit
       -458,000,000 -664,000,000 -801,000,000 -1,498,000,000 -1,562,000,000 -1,564,000,000 -1,293,000,000 -1,125,000,000 -939,000,000 -819,000,000 -570,000,000 -158,000,000   -315,000,000  -241,000,000 -550,000,000 -725,000,000 -721,000,000 -672,000,000 -476,000,000               
        alcoa corporation shareholders’ equity:
                                           
        total alcoa corporation shareholders’ equity
          5,250,000,000 3,899,000,000 3,994,000,000 4,251,000,000 4,509,000,000 4,842,000,000 4,690,000,000 5,076,000,000 5,371,000,000 5,666,000,000 4,579,000,000 4,672,000,000 3,878,000,000 3,769,000,000 3,248,000,000 3,311,000,000 3,395,000,000 3,705,000,000 4,275,000,000 4,112,000,000 4,539,000,000 4,895,000,000 5,157,000,000 5,389,000,000 5,216,000,000 5,024,000,000 5,368,000,000 4,523,000,000 5,862,000,000 5,954,000,000 5,876,000,000 5,654,000,000  
        total liabilities and equity
          14,542,000,000 14,307,000,000 14,328,000,000 14,155,000,000 13,917,000,000 14,128,000,000 14,369,000,000 14,756,000,000 14,885,000,000 15,709,000,000 15,988,000,000 15,025,000,000 14,197,000,000 14,438,000,000 14,931,000,000 14,860,000,000 14,250,000,000 13,300,000,000 13,651,000,000 14,631,000,000 14,670,000,000 15,349,000,000 15,956,000,000 15,938,000,000 16,185,000,000 16,518,000,000 17,096,000,000 17,447,000,000 17,254,000,000 16,929,000,000 17,076,000,000 16,741,000,000 17,305,000,000 
        assets held for sale
                         648,000,000                  
        liabilities held for sale
                         242,000,000                  
        retained
                             -555,000,000 -252,000,000 -31,000,000            
        fair value of derivative contracts
                                    52,000,000 113,000,000 112,000,000 259,000,000 357,000,000 468,000,000 270,000,000 
        parent company net investment
                                          11,458,000,000 
        retained deficit
                                         -104,000,000  
        restricted cash
                                          1,228,000,000 
        goodwill
                                          155,000,000 
        total parent company investment and accumulated other comprehensive loss
                                          6,980,000,000 
      Cashflow Statements:
      Quarterly
      Annual
        Unit: USD2026-03-31 2025-09-30 2025-06-30 2025-03-31 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 2021-09-30 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 
                                           
          cash from operations
          488,000,000 75,000,000 143,000,000 287,000,000 -223,000,000           6,000,000  158,000,000      168,000,000          
          net income
        417,000,000 218,000,000 151,000,000 548,000,000    -227,000,000 -193,000,000 -121,000,000 -232,000,000 -420,000,000 -769,000,000 674,000,000 553,000,000 370,000,000 350,000,000 219,000,000    139,000,000    -58,000,000 212,000,000 155,000,000 230,000,000 274,000,000 -56,000,000 169,000,000 138,000,000 308,000,000  
          adjustments to reconcile net income to cash from operations:
                                           
          depreciation, depletion, and amortization
        162,000,000 160,000,000 153,000,000 148,000,000 159,000,000 163,000,000 161,000,000 163,000,000 163,000,000 153,000,000 153,000,000 147,000,000 149,000,000 161,000,000 160,000,000 156,000,000 161,000,000 182,000,000 170,000,000 161,000,000 152,000,000 170,000,000 183,000,000 184,000,000 174,000,000 172,000,000 174,000,000 172,000,000 193,000,000 194,000,000 188,000,000 195,000,000 190,000,000 179,000,000 182,000,000 
          deferred income taxes
        76,000,000 -277,000,000 22,000,000 50,000,000 67,000,000 -12,000,000 -63,000,000 134,000,000 -120,000,000 -12,000,000 -24,000,000 126,000,000 97,000,000 -4,000,000 13,000,000 30,000,000 18,000,000 -14,000,000 -6,000,000 -29,000,000 23,000,000 -44,000,000 -5,000,000 31,000,000 33,000,000 -20,000,000 15,000,000 -20,000,000 -11,000,000 112,000,000 14,000,000 27,000,000 23,000,000 -799,000,000 
          equity loss, net of dividends
        6,000,000   -9,000,000 10,000,000 -31,000,000 23,000,000  38,000,000                           
          restructuring and other charges
        18,000,000 885,000,000 14,000,000 5,000,000 30,000,000 18,000,000 202,000,000 -11,000,000 22,000,000 24,000,000 149,000,000 -6,000,000 652,000,000 -75,000,000 125,000,000 33,000,000 33,000,000 7,000,000 60,000,000 5,000,000 37,000,000 2,000,000 363,000,000 185,000,000 370,000,000 113,000,000 138,000,000 177,000,000 231,000,000 -19,000,000 297,000,000 -10,000,000 12,000,000 10,000,000 209,000,000 
          net loss from investing activities – asset sales
        -1,000,000   3,000,000 1,000,000 6,000,000 11,000,000  -1,000,000 1,000,000 18,000,000                         
          mark-to-market gain on noncurrent marketable securities
        -88,000,000                                   
          net periodic pension benefit cost
        6,000,000 5,000,000 4,000,000 5,000,000 3,000,000 2,000,000 3,000,000 2,000,000 2,000,000 1,000,000 1,000,000 15,000,000 11,000,000 14,000,000 14,000,000 12,000,000 12,000,000 12,000,000 35,000,000 36,000,000 34,000,000 33,000,000 29,000,000 30,000,000 30,000,000 30,000,000 31,000,000 34,000,000 41,000,000 40,000,000 28,000,000 28,000,000 27,000,000 28,000,000 23,000,000 
          stock-based compensation
        13,000,000 10,000,000 12,000,000 11,000,000 9,000,000 12,000,000 10,000,000 8,000,000 6,000,000 11,000,000 10,000,000 12,000,000 8,000,000 11,000,000 9,000,000 8,000,000 10,000,000 8,000,000 1,000,000 7,000,000 9,000,000 8,000,000 1,000,000 8,000,000 11,000,000 10,000,000 6,000,000 9,000,000 10,000,000 10,000,000 3,000,000 7,000,000 7,000,000 7,000,000 4,000,000 
          gain on mark-to-market derivative financial contracts
        -2,000,000          -18,000,000  39,000,000                       
          other
        9,000,000 16,000,000 14,000,000 35,000,000 2,000,000 11,000,000 20,000,000 11,000,000 8,000,000 11,000,000 48,000,000 23,000,000 2,000,000 6,000,000 22,000,000 16,000,000 29,000,000 -1,000,000 21,000,000 6,000,000 1,000,000 4,000,000 11,000,000 -5,000,000 1,000,000 23,000,000 5,000,000 -32,000,000 -18,000,000 -14,000,000 1,000,000 34,000,000 -12,000,000 9,000,000 -28,000,000 
          changes in assets and liabilities, excluding effects of divestitures and foreign currency translation adjustments:
                                           
          increase in receivables
        -117,000,000   -85,000,000                                
          increase in inventories
        -183,000,000           33,000,000 77,000,000                  -136,000,000 -16,000,000 16,000,000 -102,000,000  
          decrease in prepaid expenses and other current assets
        -7,000,000  40,000,000 87,000,000 -35,000,000 29,000,000 -6,000,000  -10,000,000 59,000,000 4,000,000     -19,000,000 1,000,000 57,000,000  8,000,000 2,000,000 11,000,000    13,000,000    2,000,000    13,000,000 -30,000,000 
          decrease in accounts payable, trade
        -195,000,000 -27,000,000 -27,000,000 -206,000,000 -92,000,000 41,000,000 -98,000,000    -273,000,000                         
          decrease in accrued expenses
        -94,000,000 -89,000,000 58,000,000 -206,000,000 -58,000,000 -8,000,000 -22,000,000 -14,000,000 -71,000,000 -3,000,000 -45,000,000 -51,000,000 -19,000,000                       
          decrease in taxes, including income taxes
        -26,000,000        94,000,000 -133,000,000 -13,000,000                         
          pension contributions
        -3,000,000 -2,000,000 -2,000,000 -12,000,000 -4,000,000 -4,000,000 -6,000,000 -4,000,000 -11,000,000 -5,000,000 -4,000,000 -5,000,000 -3,000,000 -5,000,000 -4,000,000 -5,000,000 -507,000,000 -63,000,000 -260,000,000 -24,000,000 -11,000,000 -48,000,000 -106,000,000 -12,000,000 -48,000,000 -7,000,000 -52,000,000 -248,000,000 -652,000,000 -40,000,000 -24,000,000 -35,000,000 -26,000,000 -21,000,000 -21,000,000 
          increase in noncurrent assets
        -68,000,000       -31,000,000 -113,000,000   7,000,000 -23,000,000                     -3,000,000  
          decrease in noncurrent liabilities
        -102,000,000 1,000,000 -27,000,000 -65,000,000 -41,000,000 -33,000,000 -39,000,000 -34,000,000 45,000,000 -46,000,000 -58,000,000 33,000,000 -37,000,000                       
          cash provided from operations
        -179,000,000       198,000,000 69,000,000 -13,000,000 -163,000,000 118,000,000 134,000,000 536,000,000 34,000,000 435,000,000      -90,000,000 262,000,000 174,000,000   535,000,000 288,000,000 -430,000,000 55,000,000 455,000,000 384,000,000 311,000,000 74,000,000 239,000,000 
          financing activities
                                           
          additions to debt
        104,000,000 7,000,000 1,033,000,000 24,000,000 965,000,000 47,000,000 55,000,000 25,000,000     495,000,000        7,000,000 492,000,000 61,000,000 18,000,000 1,000,000 2,000,000  
          payments on debt
        -4,000,000 -79,000,000 -44,000,000 -946,000,000 -19,000,000 -45,000,000 -221,000,000 -33,000,000 -23,000,000 -15,000,000 -1,000,000     -518,000,000           -30,000,000 -98,000,000 -3,000,000 -4,000,000 -5,000,000 -45,000,000 -5,000,000 -5,000,000 -18,000,000 
          dividends paid on alcoa preferred stock
                                          
          dividends paid on alcoa common stock
        -27,000,000 -26,000,000 -26,000,000 -26,000,000 -26,000,000 -18,000,000 -19,000,000 -18,000,000 -18,000,000 -18,000,000 -18,000,000 -17,000,000 -18,000,000 -19,000,000 -18,000,000                     
          payments related to tax withholding on stock-based compensation awards
        -11,000,000 -5,000,000 -15,000,000 -34,000,000 -19,000,000                     
          financial contributions for the divestiture of businesses
         -1,000,000 -3,000,000 -2,000,000 -7,000,000 -5,000,000 -7,000,000 -8,000,000 -19,000,000 -11,000,000 -14,000,000 -14,000,000 -10,000,000 -6,000,000 -3,000,000 -1,000,000 -7,000,000 -6,000,000 -8,000,000 -6,000,000 -12,000,000 -12,000,000              
          contributions from noncontrolling interest
         27,000,000 4,000,000 61,000,000 24,000,000 42,000,000 36,000,000 86,000,000 64,000,000 67,000,000 37,000,000 46,000,000    8,000,000   10,000,000 20,000,000 1,000,000 20,000,000 40,000,000 56,000,000 53,000,000 24,000,000 32,000,000 24,000,000  
          cash from financing activities
        60,000,000  -67,000,000 77,000,000 -84,000,000 -75,000,000 754,000,000  35,000,000 -24,000,000 40,000,000  -185,000,000    -849,000,000 428,000,000  692,000,000 -71,000,000 -44,000,000    -199,000,000    -147,000,000     -698,000,000 
          investing activities
                                           
          capital expenditures
        -119,000,000       -188,000,000 -145,000,000 -115,000,000 -83,000,000 -171,000,000 -128,000,000 -107,000,000 -74,000,000 -83,000,000      -91,000,000 -134,000,000 -87,000,000   -148,000,000 -82,000,000 -95,000,000 -74,000,000 -150,000,000 -96,000,000 -88,000,000 -71,000,000 -146,000,000 
          free cash flows
        -298,000,000       10,000,000 -76,000,000 -128,000,000 -246,000,000 -53,000,000 6,000,000 429,000,000 -40,000,000 352,000,000      -181,000,000 128,000,000 87,000,000   387,000,000 206,000,000 -525,000,000 -19,000,000 305,000,000 288,000,000 223,000,000 3,000,000 93,000,000 
          proceeds from the sale of assets
        4,000,000    1,000,000 1,000,000  1,000,000 1,000,000  1,000,000 2,000,000 2,000,000 10,000,000 114,000,000 591,000,000  -1,000,000 199,000,000  12,000,000 11,000,000          
          additions to investments
        -15,000,000 -13,000,000 -14,000,000 -15,000,000 -13,000,000 -17,000,000 -19,000,000 -15,000,000 -16,000,000 -20,000,000 -11,000,000 -21,000,000 -4,000,000 -1,000,000 -2,000,000 -6,000,000 -3,000,000 -2,000,000 -1,000,000 -1,000,000 -110,000,000 -1,000,000 -1,000,000 -1,000,000   -22,000,000 -8,000,000 -11,000,000 -25,000,000 
          cash from investing activities
        -129,000,000 -11,000,000 -132,000,000 -108,000,000 -153,000,000 -164,000,000 -117,000,000 -197,000,000 -166,000,000 -120,000,000 -102,000,000 -171,000,000 -138,000,000 -93,000,000 -93,000,000 -77,000,000 34,000,000 514,000,000 -117,000,000 -78,000,000 -79,000,000 107,000,000 -134,000,000 -76,000,000 -199,000,000 -59,000,000 -148,000,000 -83,000,000 -100,000,000 -74,000,000 -170,000,000 -100,000,000 -87,000,000 131,000,000 1,082,000,000 
          effect of exchange rate changes on cash and cash equivalents and restricted cash
        3,000,000 3,000,000 23,000,000 12,000,000 11,000,000 -10,000,000 -6,000,000   3,000,000 2,000,000 11,000,000 -18,000,000 -11,000,000 9,000,000 -9,000,000 9,000,000 -11,000,000 13,000,000 -1,000,000 -2,000,000 -24,000,000 4,000,000 -10,000,000 5,000,000 -6,000,000 -3,000,000 6,000,000 -11,000,000 4,000,000      
          net change in cash and cash equivalents and restricted cash
        -245,000,000 -28,000,000 312,000,000 56,000,000 -83,000,000 38,000,000 408,000,000 17,000,000 -67,000,000 -154,000,000 -223,000,000 -67,000,000 -207,000,000 83,000,000 -259,000,000 -196,000,000 -892,000,000 937,000,000 -129,000,000 771,000,000 136,000,000 -51,000,000 39,000,000 7,000,000 -183,000,000 -96,000,000 90,000,000 -69,000,000 -108,000,000 -162,000,000      
          cash and cash equivalents and restricted cash at beginning of year
        1,692,000,000 1,234,000,000 1,047,000,000 1,474,000,000 1,924,000,000 1,610,000,000 883,000,000 1,116,000,000 1,365,000,000      
          cash and cash equivalents and restricted cash at end of period
        1,447,000,000 -28,000,000 312,000,000 1,290,000,000 -83,000,000 38,000,000 1,455,000,000  -67,000,000 -154,000,000 1,251,000,000    1,665,000,000 -196,000,000 -892,000,000 2,547,000,000  771,000,000 136,000,000 832,000,000  7,000,000 -183,000,000 1,020,000,000  -69,000,000 -108,000,000 1,203,000,000      
          net
                              -355,000,000 -147,000,000          -120,000,000  
          (gain) loss on mark-to-market derivative financial contracts
                                           
          decrease (increase) in receivables
                              156,000,000 33,000,000          7,000,000  
          decrease (increase) in prepaid expenses and other current assets
                                      -19,000,000 10,000,000    
          increase in taxes, including income taxes
         192,000,000 -79,000,000 -27,000,000 -15,000,000 52,000,000 18,000,000     -49,000,000 -24,000,000   103,000,000   24,000,000 88,000,000   14,000,000 -2,000,000 -299,000,000 -43,000,000 -7,000,000 147,000,000 17,000,000 84,000,000 96,000,000     
          distributions to noncontrolling interest
            -17,000,000 -26,000,000 -6,000,000 -6,000,000 -2,000,000 -16,000,000 -6,000,000 -60,000,000 -74,000,000 -83,000,000 -162,000,000 -40,000,000 -75,000,000 -62,000,000 -55,000,000 -46,000,000 -75,000,000 -31,000,000 -84,000,000 -102,000,000 -72,000,000 -214,000,000 -261,000,000 -181,000,000 -118,000,000 -267,000,000 -98,000,000 -89,000,000 -98,000,000 -57,000,000  
          acquisition of noncontrolling interest
                                           
          cash (used for) provided from financing activities
                      -209,000,000         -81,000,000        -115,000,000 -78,000,000 -260,000,000  
          sale of investments
         150,000,000                                
          mezzanine equity
                                           
          non- controlling interest
                                           
          balance at january 1, 2024
                                           
          other comprehensive income
                                           
          net effect of tax withholding for compensation plans and exercise of stock options
                                           
          contributions
                                           
          distributions
                                           
          balance at march 31, 2024
                                           
          other comprehensive loss
                                           
          balance at june 30, 2024
                                           
          balance at september 30, 2024
                                           
          balance at january 1, 2025
                                           
          joint venture formation
                                           
          balance at march 31, 2025
                                           
          balance at june 30, 2025
                                           
          balance at september 30, 2025
                                           
          equity income, net of dividends
                                       -13,000,000 15,000,000 -1,000,000 14,000,000 
          net loss from investing activities – asset and investment sales
                                           
          decrease in receivables
            81,000,000 -71,000,000 -212,000,000  37,000,000 31,000,000 40,000,000         -98,000,000 194,000,000 -70,000,000    42,000,000    43,000,000     -108,000,000 
          decrease in inventories
          44,000,000 -155,000,000 -78,000,000 86,000,000 71,000,000  144,000,000 5,000,000 17,000,000      -116,000,000 -68,000,000  37,000,000 143,000,000 41,000,000    17,000,000         -24,000,000 
          decrease in noncurrent assets
          -50,000,000 -47,000,000  16,000,000 9,000,000    -29,000,000      -12,000,000 -22,000,000   -13,000,000 32,000,000              
          loss on mark-to-market derivative financial contracts
           -5,000,000 35,000,000 -21,000,000 2,000,000  27,000,000                           
          net loss
            98,000,000 31,000,000 -307,000,000             -20,000,000                
          adjustments to reconcile net loss to cash from operations:
                                           
          proceeds from the exercise of employee stock options
               1,000,000 1,000,000 21,000,000 5,000,000 10,000,000 4,000,000     1,000,000 1,000,000 1,000,000 7,000,000 15,000,000 5,000,000 20,000,000    
          equity loss
                                           
          net gain from investing activities—asset sales
                                           
          premium paid on early redemption of debt
                       18,000,000                    
          decrease
                              26,000,000 58,000,000            
          increase in accounts payable, trade
                   199,000,000 -108,000,000   121,000,000           -30,000,000 -30,000,000   268,000,000 90,000,000    
          repurchase of common stock
                   -150,000,000 -275,000,000 -75,000,000                     
          cash provided from (used for) financing activities
                                           
          proceeds from the sale of assets and businesses
                                      2,000,000 5,000,000 238,000,000 
          cash and cash equivalents and restricted cash at end of year
                                           
          balance at december 31, 2020
                                           
          balance at december 31, 2021
                                           
          balance at december 31, 2022
                                           
          other comprehensive
                                           
          balance at december 31, 2023
                                           
          equity loss (earnings), net of dividends
                  93,000,000                         
          balance at december 31, 2019
                                           
          common stock issued: compensation plans
                                           
          equity earnings, net of dividends
                    26,000,000 -36,000,000 -25,000,000 -38,000,000 -35,000,000 -11,000,000 1,000,000 4,000,000   9,000,000 -2,000,000 17,000,000 -3,000,000 28,000,000 -5,000,000 -6,000,000      
          net gain from investing activities – asset sales
                    2,000,000 4,000,000 1,000,000 -8,000,000 -97,000,000 -27,000,000  2,000,000 1,000,000 -177,000,000  -5,000,000 7,000,000 -8,000,000   2,000,000 -5,000,000  1,000,000    
          increase in prepaid expenses and other current assets
                      -15,000,000                     
          cash and cash equivalents and restricted cash (q) at end of period
                    -207,000,000                       
          balance at january 1, 2021
                    2,000,000                     
          balance at march 31, 2021
                    2,000,000                     
          balance at june 30, 2021
                                          
          balance at september 30, 2021
                                           
          balance at january 1, 2022
                    2,000,000                     
          balance at march 31, 2022
                    2,000,000                     
          balance at june 30, 2022
                                          
          balance at september 30, 2022
                                           
          benefit from bad debt expense
                              1,000,000            
          (increase) in receivables
                      -120,000,000   -212,000,000         166,000,000    -37,000,000    
          (increase) in inventories
                      -479,000,000             -12,000,000 -98,000,000 -169,000,000      
          (decrease) in accounts payable, trade
                      -81,000,000   -64,000,000  96,000,000 -62,000,000 -121,000,000  -55,000,000 15,000,000 -159,000,000    -106,000,000    -45,000,000  
          increase in accrued expenses
                      -72,000,000   3,000,000                  
          (decrease) in taxes, including income taxes
                      -42,000,000   -1,000,000    -11,000,000           -27,000,000 -17,000,000  
          decrease (increase) in noncurrent assets
                      29,000,000                     
          (decrease) in noncurrent liabilities
                      -37,000,000 -25,000,000 -27,000,000 -31,000,000 -12,000,000 -15,000,000   -3,000,000 -6,000,000     -7,000,000 -23,000,000   19,000,000 -20,000,000  
          (decrease) in accrued expenses
                          13,000,000 -46,000,000 -35,000,000 -85,000,000 -28,000,000 -96,000,000 -33,000,000 -18,000,000 -31,000,000 -45,000,000 -57,000,000 -186,000,000 -243,000,000 -82,000,000 -57,000,000 -181,000,000 18,000,000 
          (increase) in noncurrent assets
                          -18,000,000    8,000,000 -22,000,000 -10,000,000 -12,000,000 -40,000,000 -36,000,000 -13,000,000  -42,000,000    
          third quarter ended september 30, 2020
                                           
          balance at june 30, 2020
                                           
          balance at september 30, 2020
                                           
          third quarter ended september 30, 2021
                                           
          nine months ended september 30, 2020
                                           
          nine months ended september 30, 2021
                                           
          provision for bad debt expense
                           2,000,000    20,000,000          
          balance at december 31, 2017
                                  2,000,000      
          balance at december 31, 2018
                                         
          increase in noncurrent liabilities
                             -43,000,000    1,000,000 -39,000,000    -50,000,000    55,000,000 
          cash paid to former parent company related to separation
                                           
          net change in short-term borrowings
                                      5,000,000 -1,000,000 1,000,000 2,000,000  
          balance at december 31, 2016
                                    2,000,000      
          third quarter ended september 30, 2018
                                           
          balance at june 30, 2018
                                          
          balance at september 30, 2018
                                           
          third quarter ended september 30, 2019
                                           
          balance at june 30, 2019
                                          
          balance at september 30, 2019
                                           
          nine months ended september 30, 2018
                                           
          nine months ended september 30, 2019
                                           
          changes in assets and liabilities, excluding effects of foreign currency translation adjustments:
                                           
          second quarter ended june 30, 2018
                                           
          balance at march 31, 2018
                                    2,000,000      
          second quarter ended june 30, 2019
                                           
          balance at march 31, 2019
                                           
          six months ended june 30, 2018
                                           
          six months ended june 30, 2019
                                           
          changes in assets and liabilities, excluding effects of acquisitions, divestitures, and foreign currency translation adjustments:
                                           
          net transfers from former parent company
                                           
          sales of investments
                                          
          balance at december 31, 2015
                                      11,042,000,000  
          establishment of additional defined benefit plans
                                           
          change in parent company net investment
                                      -161,000,000 117,000,000 -282,000,000 316,000,000  
          cash provided at separation to parent company
                                           
          separation-related adjustments
                                           
          issuance of common stock
                                           
          balance at march 31, 2017
                                    2,000,000      
          balance at june 30, 2017
                                           
          net transfers from (to) former parent company
                                           
          net change in restricted cash
                                        7,000,000 -11,000,000  
          effect of exchange rate changes on cash and cash equivalents
                                      7,000,000 -4,000,000 4,000,000 6,000,000 -11,000,000 
          net change in cash and cash equivalents
                                      239,000,000 165,000,000 150,000,000 -49,000,000 612,000,000 
          cash and cash equivalents at beginning of year
                                      853,000,000 
          cash and cash equivalents at end of year
                                           
          balance at december 31, 2014
                                           
          net transfers from parent company
                                           
          cash paid to arconic related to separation
                                       -9,000,000 -238,000,000  
          cash and cash equivalents at end of period
                                       165,000,000 150,000,000 804,000,000  
          balance at june 30, 2016
                                          
          establishment of defined benefit plans
                                           
          balance at september 30, 2016
                                           
          balance at september 30, 2017
                                           
          balance at march 31, 2016
                                        11,148,000,000  
          proceeds from exercise of employee stock options
                                         18,000,000  
          net transfers from (to) parent company
                                          395,000,000 
          other comprehensive income, net of tax
                                           
          change in unrecognized net actuarial loss and prior service cost/benefit related to pension and other postretirement benefits
                                           
          foreign currency translation adjustments
                                           
          net change in unrecognized gains/losses on cash flow hedges
                                           
          total other comprehensive income, net of tax
                                           
          comprehensive income
                                           
          assets
                                           
          current assets:
                                           
          cash and cash equivalents
                                           
          restricted cash
                                           
          receivables from customers
                                           
          other receivables
                                           
          inventories
                                           
          prepaid expenses and other current assets
                                           
          total current assets
                                           
          properties, plants, and equipment
                                           
          less: accumulated depreciation, depletion, and amortization
                                           
          goodwill
                                           
          investments
                                           
          fair value of derivative contracts
                                           
          other noncurrent assets
                                           
          total assets
                                           
          liabilities
                                           
          current liabilities:
                                           
          accounts payable, trade
                                           
          accrued compensation and retirement costs
                                           
          taxes, including income taxes
                                           
          other current liabilities
                                           
          long-term debt due within one year
                                           
          total current liabilities
                                           
          long-term debt, less amount due within one year
                                           
          accrued pension benefits
                                           
          accrued other postretirement benefits
                                           
          environmental remediation
                                           
          asset retirement obligations
                                           
          noncurrent income taxes
                                           
          other noncurrent liabilities and deferred credits
                                           
          total liabilities
                                           
          contingencies and commitments
                                           
          equity
                                           
          parent company net investment
                                           
          accumulated other comprehensive loss
                                           
          total parent company investment and accumulated other comprehensive loss
                                           
          noncontrolling interest
                                           
          total equity
                                           
          total liabilities and equity
                                           
          distributions to noncontrolling interests