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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
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