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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
Jun. 30, 2020
Dec. 31, 2019
Less than 1 year [member] | Forward exchange contracts [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount $ 9,713 $ 21,216
Less than 1 year [member] | Foreign currency futures [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 1,306 1,359
Less than 1 year [member] | Interest rate swap [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 0 750
Less than 1 year [member] | Cross currency interest rate swaps [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 20 15
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 1,337 1,411
Less than 1 year [member] | Other commodity derivatives [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 622 771
Less than 1 year [member] | Equity derivatives [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 7,904 11,638
1-2 years [member] | Forward exchange contracts [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 752 36
1-2 years [member] | Foreign currency futures [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 0 723
1-2 years [member] | Interest rate swap [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 1,500 0
1-2 years [member] | Cross currency interest rate swaps [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 4,342 513
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 5 22
1-2 years [member] | Other commodity derivatives [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 0 20
1-2 years [member] | Equity derivatives [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 3,610 0
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 1,000 1,500
2-3 years [member] | Cross currency interest rate swaps [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 2,100 5,445
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 1,000
3-5 years [member] | Cross currency interest rate swaps [Member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 0 500
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 666 668
Greater than 5 years [member] | Other interest rate derivatives [member]    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 0 565
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