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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

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- Definition Lease liability. + References No definition available. + Details
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- Definition Lease right of use asset. + References No definition available. + Details
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- Definition Operating and finance lease liability noncurrent. + References No definition available. + Details
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- Definition Present value of lessee's discounted obligation for lease payments from finance lease, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-1 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from finance lease, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-1 + Details
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- Definition Amount, after accumulated amortization, of right-of-use asset from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-1 + Details
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