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Taxation - Summary of taxation charge (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Major Components Of Tax Expense Income [Abstract]      
– Current $ 3,726 $ 3,270 $ 2,115
– Deferred 516 695 (548)
Total taxation charge $ 4,242 $ 3,965 $ 1,567