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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, 2020
Jun. 30, 2019
Jun. 30, 2018
Available for sale investments:      
Net valuation gains on investments taken to equity     $ (3)
Cash flow hedges:      
Gains/(losses) taken to equity $ 94 $ 98 (25)
(Gains)/losses transferred to the income statement (89) (90) 64
Income tax credit relating to items that may be reclassified subsequently to the income statement 5 8 36
Items that will not be reclassified to the income statement:      
Remeasurement gains/(losses) on pension and medical schemes 25 7 (22)
Others 1 12 8
Income tax credit/(charge) relating to items that will not be reclassified to the income statement 26 19 (14)
Total income tax credit relating to components of other comprehensive income $ 31 $ 27 $ 22