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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, 2021
Dec. 31, 2020
Less than 1 year [member] | Forward exchange contracts [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount $ 12,599 $ 18,505
Less than 1 year [member] | Foreign currency futures [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 1,617 2,218
Less than 1 year [member] | Interest rate swap [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 1,500 0
Less than 1 year [member] | Cross currency interest rate swaps [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 4,614 513
Less than 1 year [member] | Other interest rate derivatives [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 0 0
Less than 1 year [member] | Aluminum swaps [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 1,241 1,184
Less than 1 year [member] | Other commodity derivatives [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 1,034 644
Less than 1 year [member] | Equity derivatives [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 11,469 10,234
1-2 years [member] | Forward exchange contracts [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 29 290
1-2 years [member] | Foreign currency futures [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 1,000 1,500
1-2 years [member] | Cross currency interest rate swaps [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 1,400 5,658
1-2 years [member] | Other interest rate derivatives [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 0 0
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 0  
1-2 years [member] | Equity derivatives [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 0 2,326
2-3 years [member] | Forward exchange contracts [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 0 0
2-3 years [member] | Foreign currency futures [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 0 0
2-3 years [member] | Interest rate swap [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 0 1,000
2-3 years [member] | Cross currency interest rate swaps [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 1,173 1,400
2-3 years [member] | Other interest rate derivatives [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 0 0
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] | Forward exchange contracts [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 0 0
3-5 years [member] | Foreign currency futures [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 0 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 1,573 1,866
3-5 years [member] | Other interest rate derivatives [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 0 0
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] | Forward exchange contracts [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 0 0
Greater than 5 years [member] | Foreign currency futures [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 1,453 789
Greater than 5 years [member] | Other interest rate derivatives [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 0 0
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