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Leases - Supplemental Balance Sheet Information Related to Company's Leases (Detail) - USD ($)
$ in Millions
Sep. 30, 2024
Sep. 30, 2023
Lease ROU assets:    
Operating $ 104 $ 101
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Other assets Other assets
Finance $ 37 $ 39
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Net property, plant and equipment Net property, plant and equipment
Total lease ROU assets $ 141 $ 140
Lease liabilities:    
Operating $ 14 $ 15
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Accounts payable and accrued liabilities Accounts payable and accrued liabilities
Finance $ 4 $ 4
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Current portion of long-term debt Current portion of long-term debt
Operating $ 88 $ 84
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Other liabilities Other liabilities
Finance $ 23 $ 24
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Long-term debt Long-term debt
Total lease liabilities $ 129 $ 127