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Risks Arising from Financial Instruments - Summary of Interest Expense Recognized on Unhedged and Hedged Financial Liabilities (Detail) - Interest Rate Risk [Member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of detailed information about hedging instruments [line items] |  |  |
Interest expense | $ (3,684) | $ (4,016) | $ (4,168)
Financial Liabilities at Amortised Cost, Class [Member] | Not Designated in Hedging Relationship [Member] |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Interest expense | (3,836) | (4,154) | (4,264)
Fair value hedges [member] | Hedged Item [Member] |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Interest expense | (6) | (1) | (46)
Cash flow hedges [member] | Hedged Item [Member] |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Interest expense | 17 | 19 | 15
Net investment hedges [member] | Hedging Instrument [Member] |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Interest expense | 0 | 2 | 2
Economic Hedges [Member] | Hedged Item [Member] |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Interest expense | $ 141 | $ 118 | $ 124

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