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v3.26.1

Financial Instruments and Risk Management - General (Details) $ / shares in Units, € in Millions, shares in Millions, $ in Millions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2026 USD ($) shares approach $ / shares | Mar. 31, 2025 USD ($) | Dec. 31, 2025 USD ($) | Dec. 31, 2025 EUR (€) | May 31, 2025 EUR (€) | Dec. 31, 2024 USD ($)
Financial Instruments and Risk Management |  |  |  |  |  |
Other comprehensive earnings (loss), net of tax | $ 3 | $ 61 |  |  |  |
Total shareholders' equity | 5,619 | 5,569 | $ 5,421 |  |  | $ 5,930
Accumulated Other Comprehensive Earnings (Loss) |  |  |  |  |  |
Financial Instruments and Risk Management |  |  |  |  |  |
Other comprehensive earnings (loss), net of tax | 3 | 61 |  |  |  |
Total shareholders' equity | (866) | $ (942) | (869) |  |  | $ (1,003)
Accumulated Other Comprehensive Earnings (Loss) For Non Derivative Financial Instrument |  |  |  |  |  |
Financial Instruments and Risk Management |  |  |  |  |  |
Total shareholders' equity | $ (505) |  | $ (484) |  |  |
Senior Notes 1.50%, euro denominated, due March 2027 |  |  |  |  |  |
Financial Instruments and Risk Management |  |  |  |  |  |
Interest rate (as a percent) | 1.50% |  | 1.50% | 1.50% |  |
Net Investment | Accumulated Other Comprehensive Earnings (Loss) For Non Derivative Financial Instrument |  |  |  |  |  |
Financial Instruments and Risk Management |  |  |  |  |  |
Other comprehensive earnings (loss), net of tax | $ 20 |  |  |  |  |
Total shareholders' equity | $ 12 |  |  |  |  |
Net Investment | 4.25% senior notes |  |  |  |  |  |
Financial Instruments and Risk Management |  |  |  |  |  |
Face amount of debt | € |  |  |  |  | € 850 |
Interest rate (as a percent) |  |  |  |  | 4.25% |
Net Investment | Senior Notes 1.50%, euro denominated, due March 2027 |  |  |  |  |  |
Financial Instruments and Risk Management |  |  |  |  |  |
Face amount of debt | € |  |  |  | € 550 |  |
Interest rate (as a percent) |  |  | 1.50% | 1.50% |  |
Commodity contracts |  |  |  |  |  |
Financial Instruments and Risk Management |  |  |  |  |  |
Number of methods through which entity manages commodity price risk in connection with market price fluctuations of aluminum ingot | approach | 2 |  |  |  |  |
Notional amount of contracts | $ 1,720 |  |  |  |  |
Net gain (loss) included in AOCI, after-tax | 44 |  |  |  |  |
Net gain (loss) included in AOCI, after-tax, expected to be recognized in net earnings within the next 12 months | $ 41 |  |  |  |  |
Longest duration of forecasted hedge transactions in years | 2 years |  |  |  |  |
Currency |  |  |  |  |  |
Financial Instruments and Risk Management |  |  |  |  |  |
Notional amount of contracts | $ 3,375 |  |  |  |  |
Net gain (loss) included in AOCI, after-tax | 1 |  |  |  |  |
Net gain (loss) included in AOCI, after-tax, expected to be recognized in net earnings within the next 12 months | $ 1 |  |  |  |  |
Longest duration of forecasted hedge transactions in years | 2 years |  |  |  |  |
Interest Rate |  |  |  |  |  |
Financial Instruments and Risk Management |  |  |  |  |  |
Notional amount of contracts | $ 600 |  |  |  |  |
Net gain (loss) included in AOCI, after-tax | 2 |  |  |  |  |
Net gain (loss) included in AOCI, after-tax, expected to be recognized in net earnings within the next 12 months | $ 2 |  |  |  |  |
Longest duration of forecasted hedge transactions in years | 1 year |  |  |  |  |
Net Investment |  |  |  |  |  |
Financial Instruments and Risk Management |  |  |  |  |  |
Notional amount of contracts | $ 1,050 |  |  |  |  |
Net gain (loss) included in AOCI, after-tax | $ (63) |  |  |  |  |
Longest duration of forecasted hedge transactions in years | 3 years |  |  |  |  |
Equity contracts |  |  |  |  |  |
Financial Instruments and Risk Management |  |  |  |  |  |
Combined notional value, shares | shares | 0.9 |  |  |  |  |
Change in company's stock price (in dollars per share) | $ / shares | $ 1 |  |  |  |  |

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