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Income Taxes - Components of Deferred Income Taxes (Detail) - USD ($) $ in Millions | Sep. 30, 2024 | Sep. 30, 2023
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Components of Deferred Tax Assets [Abstract] |  |
Deferred expenses | $ 40 | $ 50
Intangible assets | 47 | 42
Inventory | 14 | 14
Operating lease liability | 29 | 22
Other | 25 | 6
U.S. federal interest expense carryforward | 48 | 42
Pension and other benefits | 25 | 24
Net operating loss carryforwards ("NOLs") | 261 | 244
Capital loss carryforwards | 132 | 132
Foreign tax credit carryforwards | 68 | 68
R&D credit carryforwards | 55 | 49
Other business credit carryforwards | 21 | 19
Subtotal | 765 | 712
Valuation allowance | (494) | (498)
Total deferred tax assets | 271 | 214
Property, plant and equipment | (58) | (47)
Right of use asset | (23) | (22)
Unremitted earnings of non-U.S. subsidiaries | (16) | (15)
Total deferred tax liabilities | $ (97) | $ (84)

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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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