Leases - Future Minimum Lease Payments Under Non-cancelable Operating and Finance Leases (Detail) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Operating leases
2024	$ 18
2025	16
2026	13
2027	12
2028	10
2029 and thereafter	51
Total lease payments	120
Less: imputed interest	21
Total	$ 99
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Accounts payable and accrued liabilities
Finance leases
2024	$ 5
2025	4
2026	4
2027	3
2028	3
2029 and thereafter	15
Total lease payments	34
Less: imputed interest	6
Total	$ 28	$ 29