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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

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