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Income Tax Expense - Summary of Income Tax Expense (Detail) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Major components of tax expense (income) [abstract]      
Current tax expense $ 5,408 $ 5,052 $ 4,412
Deferred tax expense 121 1,955 31
Total taxation expense $ 5,529 $ 7,007 $ 4,443