Leases - Future Minimum Lease Payments Under Non-cancelable Operating and Finance Leases (Detail) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
Operating leases
2025	$ 17
2026	14
2027	12
2028	10
2029	10
2030 and thereafter	69
Total lease payments	132
Less: imputed interest	30
Total	$ 102
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Accounts payable and accrued liabilities
Finance leases
2025	$ 5
2026	5
2027	3
2028	3
2029	3
2030 and thereafter	13
Total lease payments	32
Less: imputed interest	5
Total	$ 27	$ 28