v3.25.1
Financial Instruments and Risk Management - General (Details)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2025
USD ($)
shares
approach
$ / shares
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 $ 1,398
Net gain (loss) included in AOCI, after-tax 15
Net gain (loss) included in AOCI, after-tax, expected to be recognized in net earnings within the next 12 months $ 15
Longest duration of forecasted hedge transactions in years 2 years
Currency  
Financial Instruments and Risk Management  
Notional amount of contracts $ 2,857
Net gain (loss) included in AOCI, after-tax (3)
Net gain (loss) included in AOCI, after-tax, expected to be recognized in net earnings within the next 12 months $ (4)
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 3
Net gain (loss) included in AOCI, after-tax, expected to be recognized in net earnings within the next 12 months $ 3
Longest duration of forecasted hedge transactions in years 2 years
Net Investment  
Financial Instruments and Risk Management  
Notional amount of contracts $ 1,050
Net gain (loss) included in AOCI, after-tax $ (6)
Longest duration of forecasted hedge transactions in years 4 years
Equity contracts  
Financial Instruments and Risk Management  
Combined notional value, shares | shares 1.3
Change in company's stock price (in dollars per share) | $ / shares $ 1