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Income Tax Expense - Summary of Income Tax Recognised in Other Comprehensive Income (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Available for sale investments:      
Net valuation gains/(losses) taken to equity $ (3)   $ (1)
Cash flow hedges:      
Gains/(losses) taken to equity (25) $ (105) 170
(Gains)/losses transferred to the income statement 64 129 (199)
Income tax credit/(charge) relating to items that may be reclassified subsequently to the income statement 36 24 (30)
Items that will not be reclassified to the income statement:      
Remeasurement gains/(losses) on pension and medical schemes (22) (12) 5
Employee share awards transferred to retained earnings on exercise 8 (14) (22)
Income tax charge relating to items that will not be reclassified to the income statement (14) (26) (17)
Total income tax credit/(charge) relating to components of other comprehensive income $ 22 $ (2) $ (47)