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Income Tax Expense - Summary of Income Tax Recognised in Other Comprehensive Income (Parenthetical) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Major components of tax expense (income) [abstract]      
Income tax relating to components of other comprehensive income, deferred taxes $ 17 $ 12 $ (25)
Income tax relating to components of other comprehensive income, current taxes $ 5 $ (14) $ (22)