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Income Taxes - Components of Deferred Income Taxes (Detail) - USD ($) $ in Millions | Sep. 30, 2025 | Sep. 30, 2024
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Components of Deferred Tax Assets [Abstract] |  |
Deferred expenses | $ 42 | $ 40
Intangible assets | 52 | 47
Inventory | 15 | 14
Operating lease liability | 28 | 29
Other | 26 | 25
U.S. federal interest expense carryforward | 56 | 48
Pension and other benefits | 22 | 25
Net operating loss carryforwards ("NOLs") | 249 | 261
Capital loss carryforwards | 132 | 132
Foreign tax credit carryforwards | 66 | 68
R&D credit carryforwards | 57 | 55
Other business credit carryforwards | 16 | 21
Subtotal | 761 | 765
Valuation allowance | (516) | (494)
Total deferred tax assets | 245 | 271
Property, plant and equipment | (67) | (58)
Right of use asset | (21) | (23)
Unremitted earnings of non-U.S. subsidiaries | (16) | (16)
Total deferred tax liabilities | $ (104) | $ (97)

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- Definition Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible interest carryforward. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-6 + Details
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