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Income Tax Expense - Summary of Income Tax Recognised in Other Comprehensive Income (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
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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)

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- Definition Current income tax relating to components of other comprehensive income. + References No definition available. + Details
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- Definition Deferred income tax relating to components of other comprehensive income. + References No definition available. + Details
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