Income Tax Expense - Summary of Income Tax Recognised in Other Comprehensive Income (Parenthetical) (Detail) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Jun. 30, 2021 |
Jun. 30, 2020 |
Jun. 30, 2019 |
|
| Major components of tax expense (income) [abstract] | |||
| Income tax relating to components of other comprehensive income, deferred taxes | $ (28) | $ 31 | $ 15 |
| Income tax relating to components of other comprehensive income, current taxes | $ 0 | $ 0 | $ 12 |