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Income Tax Expense - Summary of Income Tax Expense (Detail) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Major components of tax expense (income) [abstract]      
Current tax expense $ 5,052 $ 4,412 $ 2,621
Deferred tax expense/(benefit) 1,955 31 (518)
Total taxation expense/(benefit) $ 7,007 $ 4,443 $ 2,103