Employee Benefits, Restructuring and Post-retirement Employee Benefits Provisions - Summary of Reconciliation of Employee Benefits, Restructuring and Post-retirement Employee Benefits (Parenthetical) (Detail) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Disclosure Of Employee Benefits Restructuring And Post Retirement Employee Benefits Provisions [line items] | ||
| Defined Benefit Obligation at Present Value | $ 127 | $ 142 |
| Recognised Assets Defined Benefit Plan | 134 | 147 |
| Unfunded Defined Pension And Post Retirement Medical Benefits | 67 | 63 |
| UnFunded Postemployment Benefit Obligations | $ 276 | $ 242 |