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Financial Instruments and Risk Management - General (Details)
$ / shares in Units, € in Millions, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
USD ($)
shares
approach
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
shares
approach
$ / shares
Jun. 30, 2024
USD ($)
May 31, 2025
EUR (€)
Mar. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Financial Instruments and Risk Management                  
Other comprehensive earnings (loss), net of tax $ 13 $ 28 $ (48) $ 5          
Total shareholders' equity 5,277 6,983 5,277 6,983   $ 5,569 $ 5,930 $ 7,377 $ 3,837
Accumulated Other Comprehensive Earnings (Loss)                  
Financial Instruments and Risk Management                  
Other comprehensive earnings (loss), net of tax 13 28 (48) 5          
Total shareholders' equity (955) $ (921) (955) $ (921)   $ (942) (1,003) $ (893) $ (916)
Accumulated Other Comprehensive Earnings (Loss) For Non Derivative Financial Instrument                  
Financial Instruments and Risk Management                  
Total shareholders' equity (501)   (501)       $ (618)    
Net Investment | Accumulated Other Comprehensive Earnings (Loss) For Non Derivative Financial Instrument                  
Financial Instruments and Risk Management                  
Other comprehensive earnings (loss), net of tax 35   35            
Total shareholders' equity $ 35   $ 35            
Net Investment | 4.25% senior notes                  
Financial Instruments and Risk Management                  
Face amount of debt | €         € 850        
Interest rate (as a percent)         4.25%        
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   2            
Notional amount of contracts $ 1,586   $ 1,586            
Net gain (loss) included in AOCI, after-tax $ (11)   (11)            
Net gain (loss) included in AOCI, after-tax, expected to be recognized in net earnings within the next 12 months     $ (11)            
Longest duration of forecasted hedge transactions in years 2 years   2 years            
Currency                  
Financial Instruments and Risk Management                  
Notional amount of contracts $ 3,064   $ 3,064            
Net gain (loss) included in AOCI, after-tax $ (3)   (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   2 years            
Interest Rate                  
Financial Instruments and Risk Management                  
Notional amount of contracts $ 600   $ 600            
Net gain (loss) included in AOCI, after-tax $ 1   1            
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 2 years   2 years            
Net Investment                  
Financial Instruments and Risk Management                  
Notional amount of contracts $ 1,050   $ 1,050            
Net gain (loss) included in AOCI, after-tax $ (90)   $ (90)            
Longest duration of forecasted hedge transactions in years 4 years   4 years            
Equity contracts                  
Financial Instruments and Risk Management                  
Combined notional value, shares | shares 1.3   1.3            
Change in company's stock price (in dollars per share) | $ / shares     $ 1