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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

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