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Risks Arising from Financial Instruments - Summary of Notional Amounts of Derivatives Outstanding at Year-end by Maturity Bucket (Detail) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Less than 1 year [member] | Foreign exchange forwards [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount $ 8,867 $ 13,440
Less than 1 year [member] | Other foreign exchange derivatives [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 385 245
Less than 1 year [member] | Interest rate swap [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 1,791 580
Less than 1 year [member] | Cross currency interest rate swaps [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 1,558 1,217
Less than 1 year [member] | Aluminum swaps [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 1,841 1,780
Less than 1 year [member] | Other commodity derivatives [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 630 913
Less than 1 year [member] | Equity derivatives [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 10,520 11,189
1-2 years [member] | Foreign exchange forwards [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 300 105
1-2 years [member] | Other foreign exchange derivatives [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 0 0
1-2 years [member] | Interest rate swap [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 0 0
1-2 years [member] | Cross currency interest rate swaps [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 510 1,863
1-2 years [member] | Aluminum swaps [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 0 0
1-2 years [member] | Other commodity derivatives [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 26 25
1-2 years [member] | Equity derivatives [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 0 0
2-3 years [member] | Foreign exchange forwards [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 150 300
2-3 years [member] | Other foreign exchange derivatives [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 150 0
2-3 years [member] | Interest rate swap [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 0 0
2-3 years [member] | Cross currency interest rate swaps [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 2,593 510
2-3 years [member] | Aluminum swaps [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 0 0
2-3 years [member] | Other commodity derivatives [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 0 0
2-3 years [member] | Equity derivatives [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 0 0
3-5 years [member] | Foreign exchange forwards [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 0 0
3-5 years [member] | Other foreign exchange derivatives [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 400 0
3-5 years [member] | Interest rate swap [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 0 0
3-5 years [member] | Cross currency interest rate swaps [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 3,598 4,353
3-5 years [member] | Aluminum swaps [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 0 0
3-5 years [member] | Other commodity derivatives [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 0 0
3-5 years [member] | Equity derivatives [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 0 0
Greater than 5 years [member] | Foreign exchange forwards [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 0 0
Greater than 5 years [member] | Other foreign exchange derivatives [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 0 0
Greater than 5 years [member] | Interest rate swap [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 0 0
Greater than 5 years [member] | Cross currency interest rate swaps [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 690 717
Greater than 5 years [member] | Aluminum swaps [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 0 0
Greater than 5 years [member] | Other commodity derivatives [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 0 0
Greater than 5 years [member] | Equity derivatives [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount $ 0 $ 0