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Leases - Supplemental Balance Sheet Information Related to Company's Leases (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Sep. 30, 2024
Lease ROU assets:    
Operating $ 101 $ 104
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Other assets Other assets
Finance $ 26 $ 37
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 $ 127 $ 141
Lease liabilities:    
Operating $ 13 $ 14
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Accounts payable and accrued liabilities Accounts payable and accrued liabilities
Finance $ 6 $ 4
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Current portion of long-term debt Current portion of long-term debt
Operating $ 85 $ 88
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Other liabilities Other liabilities
Finance $ 24 $ 23
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Long-term debt Long-term debt
Total lease liabilities $ 128 $ 129