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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, 2019
Jun. 30, 2018
Jun. 30, 2017
Available for sale investments:      
Net valuation losses taken to equity   $ (3)  
Hedges:      
Gains/(losses) taken to equity $ 98 (25) $ (105)
(Gains)/losses transferred to the income statement (90) 64 129
Income tax credit relating to items that may be reclassified subsequently to the income statement 8 36 24
Items that will not be reclassified to the income statement:      
Remeasurement gains/(losses) on pension and medical schemes 7 (22) (12)
Employee share awards transferred to retained earnings on exercise 12 8 (14)
Income tax credit/(charge) relating to items that will not be reclassified to the income statement 19 (14) (26)
Total income tax credit/(charge) relating to components of other comprehensive income $ 27 $ 22 $ (2)