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Other Equity - Summary of Reserves (Detail) - USD ($)
$ in Millions
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Other reserves [abstract]      
Share premium account $ 518 $ 518 $ 518
Foreign currency translation reserve 43 39 37
Employee share awards reserve 268 246 213
Cash flow hedge reserve 100 50 114
Cost of hedging reserve (54) (23) (74)
Equity investments reserve 15 16 17
Capital redemption reserve 177 177 177
Non-controlling interest contribution reserve 1,283 1,283 1,283
Total reserves $ 2,350 $ 2,306 $ 2,285