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Taxation - Summary of taxation charge (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Major components of tax expense (income) [abstract]      
– Current $ 5,169 $ 4,436 $ 3,726
– Deferred (178) (289) 516
Total taxation charge $ 4,991 $ 4,147 $ 4,242