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 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|---|---|---|
| Disclosure Of Employee Benefits Restructuring And Post Retirement Employee Benefits Provisions [line items] | ||
| Defined Benefit Obligation at Present Value | $ 315 | $ 276 |