Income Tax Expense - Summary of Income Tax Recognised in Other Comprehensive Income (Parenthetical) (Detail) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2023 |
|
| Major components of tax expense (income) [abstract] | |||
| Income tax relating to components of other comprehensive income, deferred taxes | $ 17 | $ (18) | $ 12 |
| Income tax relating to components of other comprehensive income, current taxes | |||