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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, 2025
Dec. 31, 2024
Less than 1 year [member] | Foreign exchange forwards [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount $ 10,498 $ 8,867
Less than 1 year [member] | Other foreign exchange derivatives [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 315 385
Less than 1 year [member] | Interest rate swap [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 1,191 1,791
Less than 1 year [member] | Cross currency interest rate swaps [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 510 1,558
Less than 1 year [member] | Aluminum swaps [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 2,250 1,841
Less than 1 year [member] | Other commodity derivatives [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 591 630
Less than 1 year [member] | Equity derivatives [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 11,898 10,520
1-2 years [member] | Foreign exchange forwards [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 344 300
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 2,593 510
1-2 years [member] | Aluminum swaps [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 62 0
1-2 years [member] | Other commodity derivatives [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 39 26
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 0 150
2-3 years [member] | Other foreign exchange derivatives [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 0 150
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 2,010 2,593
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 0 400
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 2,025 3,598
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 715 690
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