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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Income Tax Contingency [Line Items] |  |  |
Tax benefit of impairment and held for sale | $ 37 |  |
Tax benefit of change in permanent reinvestment assertion | 14 |  |
Deferred tax assets | 38 |  |
Valuation allowance | 24 |  |
Return to provision adjustments | 5 | $ 15 | $ (4)
Tax benefit related to federal research and development credits | 2 | 3 | 8
Uncertain tax positions | 2 | (3) | 7
Reinvested earnings at foreign subsidiaries | 1,000 |  |
Accrued interest and penalties | 2 | 1 |
Uncertain income tax position not recognized | 14 | $ 11 |
Decrease in unrecognized tax benefits is reasonably possible | 2 |  |
France Tax Authority |  |  |
Income Tax Contingency [Line Items] |  |  |
Net operating loss carryforward | 1 |  |
His Majesty's Revenue and Customs (HMRC) |  |  |
Income Tax Contingency [Line Items] |  |  |
Net operating loss carryforward | 4 |  |
Foreign Tax Jurisdiction |  |  |
Income Tax Contingency [Line Items] |  |  |
Tax benefit related to federal research and development credits |  |  | $ 8
Domestic Tax Jurisdiction |  |  |
Income Tax Contingency [Line Items] |  |  |
Net operating loss carryforward | 0 |  |
State and Local Jurisdiction |  |  |
Income Tax Contingency [Line Items] |  |  |
Net operating loss carryforward | $ 21 |  |

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12A -Subparagraph (a)(5) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 + Details
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