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Risks Arising from Financial Instruments - Summary of Effective Interest Rates at Balance Sheet (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Disclosure of offsetting financial assets and liabilities [line items] |  |
Hedging | $ (5,886) | $ (6,804)
Before hedging [Member] | Floating interest rate [member] |  |
Disclosure of offsetting financial assets and liabilities [line items] |  |
Hedging | 2,310 | 3,962
Before hedging [Member] | Fixed interest rate [member] |  |
Disclosure of offsetting financial assets and liabilities [line items] |  |
Hedging | $ 86,520 | $ 94,602
Before hedging [Member] | Australian Dollar [member] | Floating interest rate [member] |  |
Disclosure of offsetting financial assets and liabilities [line items] |  |
Hedging | 1.03% | 0.99%
Hedging | $ 218 | $ 231
Before hedging [Member] | Australian Dollar [member] | Fixed interest rate [member] |  |
Disclosure of offsetting financial assets and liabilities [line items] |  |
Hedging | 4.12% | 3.91%
Hedging | $ 324 | $ 846
Before hedging [Member] | Brazilian Real [member] | Floating interest rate [member] |  |
Disclosure of offsetting financial assets and liabilities [line items] |  |
Hedging |  | 3.90%
Hedging |  | $ 164
Before hedging [Member] | Brazilian Real [member] | Fixed interest rate [member] |  |
Disclosure of offsetting financial assets and liabilities [line items] |  |
Hedging | 7.21% | 8.58%
Hedging | $ 420 | $ 578
Before hedging [Member] | Canadian Dollar [member] | Fixed interest rate [member] |  |
Disclosure of offsetting financial assets and liabilities [line items] |  |
Hedging | 4.11% | 4.12%
Hedging | $ 626 | $ 613
Before hedging [Member] | Euro [member] | Floating interest rate [member] |  |
Disclosure of offsetting financial assets and liabilities [line items] |  |
Hedging |  | 0.15%
Hedging | $ 1,113 | $ 2,690
Before hedging [Member] | Euro [member] | Fixed interest rate [member] |  |
Disclosure of offsetting financial assets and liabilities [line items] |  |
Hedging | 2.27% | 2.12%
Hedging | $ 21,654 | $ 26,092
Before hedging [Member] | Pound Sterling [member] | Fixed interest rate [member] |  |
Disclosure of offsetting financial assets and liabilities [line items] |  |
Hedging | 4.35% | 4.30%
Hedging | $ 3,611 | $ 3,655
Before hedging [Member] | South Korean Won [member] | Fixed interest rate [member] |  |
Disclosure of offsetting financial assets and liabilities [line items] |  |
Hedging | 3.85% |
Hedging | $ 32 |
Before hedging [Member] | US Dollar [member] | Floating interest rate [member] |  |
Disclosure of offsetting financial assets and liabilities [line items] |  |
Hedging | 1.67% | 1.05%
Hedging | $ 463 | $ 617
Before hedging [Member] | US Dollar [member] | Fixed interest rate [member] |  |
Disclosure of offsetting financial assets and liabilities [line items] |  |
Hedging | 4.93% | 4.91%
Hedging | $ 59,399 | $ 62,340
Before hedging [Member] | Other currency [member] | Floating interest rate [member] |  |
Disclosure of offsetting financial assets and liabilities [line items] |  |
Hedging | 7.22% | 7.30%
Hedging | $ 516 | $ 260
Before hedging [Member] | Other currency [member] | Fixed interest rate [member] |  |
Disclosure of offsetting financial assets and liabilities [line items] |  |
Hedging | 11.42% | 11.96%
Hedging | $ 454 | $ 479
After hedging [Member] | Floating interest rate [member] |  |
Disclosure of offsetting financial assets and liabilities [line items] |  |
Hedging | 6,164 | 6,461
After hedging [Member] | Fixed interest rate [member] |  |
Disclosure of offsetting financial assets and liabilities [line items] |  |
Hedging | $ 82,666 | $ 92,103
After hedging [Member] | Brazilian Real [member] | Floating interest rate [member] |  |
Disclosure of offsetting financial assets and liabilities [line items] |  |
Hedging |  | 3.90%
Hedging |  | $ 164
After hedging [Member] | Brazilian Real [member] | Fixed interest rate [member] |  |
Disclosure of offsetting financial assets and liabilities [line items] |  |
Hedging | 7.21% | 8.58%
Hedging | $ 420 | $ 578
After hedging [Member] | Canadian Dollar [member] | Floating interest rate [member] |  |
Disclosure of offsetting financial assets and liabilities [line items] |  |
Hedging | 1.21% | 1.23%
Hedging | $ 2,043 | $ 1,895
After hedging [Member] | Canadian Dollar [member] | Fixed interest rate [member] |  |
Disclosure of offsetting financial assets and liabilities [line items] |  |
Hedging | 4.29% | 4.29%
Hedging | $ 3,158 | $ 2,646
After hedging [Member] | Euro [member] | Floating interest rate [member] |  |
Disclosure of offsetting financial assets and liabilities [line items] |  |
Hedging |  | 0.15%
Hedging | $ 1,113 | $ 2,690
After hedging [Member] | Euro [member] | Fixed interest rate [member] |  |
Disclosure of offsetting financial assets and liabilities [line items] |  |
Hedging | 2.11% | 2.15%
Hedging | $ 27,553 | $ 35,515
After hedging [Member] | Pound Sterling [member] | Floating interest rate [member] |  |
Disclosure of offsetting financial assets and liabilities [line items] |  |
Hedging | 1.05% | 1.10%
Hedging | $ 1,002 | $ 937
After hedging [Member] | Pound Sterling [member] | Fixed interest rate [member] |  |
Disclosure of offsetting financial assets and liabilities [line items] |  |
Hedging | 4.43% | 4.36%
Hedging | $ 2,937 | $ 2,973
After hedging [Member] | South Korean Won [member] | Floating interest rate [member] |  |
Disclosure of offsetting financial assets and liabilities [line items] |  |
Hedging | 1.67% |
Hedging | $ 502 |
After hedging [Member] | South Korean Won [member] | Fixed interest rate [member] |  |
Disclosure of offsetting financial assets and liabilities [line items] |  |
Hedging | 0.87% | 1.30%
Hedging | $ 1,695 | $ 1,997
After hedging [Member] | US Dollar [member] | Floating interest rate [member] |  |
Disclosure of offsetting financial assets and liabilities [line items] |  |
Hedging |  | 1.13%
Hedging |  | $ 201
After hedging [Member] | US Dollar [member] | Fixed interest rate [member] |  |
Disclosure of offsetting financial assets and liabilities [line items] |  |
Hedging | 5.41% | 5.30%
Hedging | $ 46,288 | $ 47,892
After hedging [Member] | Other currency [member] | Floating interest rate [member] |  |
Disclosure of offsetting financial assets and liabilities [line items] |  |
Hedging | 5.99% | 7.90%
Hedging | $ 1,504 | $ 573
After hedging [Member] | Other currency [member] | Fixed interest rate [member] |  |
Disclosure of offsetting financial assets and liabilities [line items] |  |
Hedging | 8.80% | 11.72%
Hedging | $ 615 | $ 502

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