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Income Taxes - Summary of Income Taxes (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Income Taxes [line items]      
Current year $ (2,857) $ (2,082) $ (2,863)
(Underprovided)/overprovided in prior years 159 119 58
Current tax expense (2,698) (1,963) (2,805)
Origination and reversal of temporary differences 319 (30) (21)
(Utilization)/recognition of deferred tax assets on tax losses 24 13 13
Recognition of previously unrecognized tax losses 5 48 27
Deferred tax (expense)/income 348 31 19
Total income tax expense $ (2,350) $ (1,932) $ (2,786)