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Taxation - Summary of taxation charge (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Major components of tax expense (income) [abstract]      
– Current $ 8,144 $ 5,169 $ 4,436
– Deferred 114 (178) (289)
Total taxation charge $ 8,258 $ 4,991 $ 4,147