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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Income Tax Contingency [Line Items] |  |  |
Tax benefit related to federal research and development credits | $ 8 | $ 0 | $ 0
Uncertain tax positions | 7 | (3) | 0
Change in tax rates | 0 | 1 | 10
Impact of GILTI and FDII | 4 | 6 | 4
Reinvested earnings at foreign subsidiaries | 386 |  |
Accrued interest and penalties | 2 | 4 |
Uncertain income tax position not recognized | 14 | 7 |
Decrease in uncertain tax positions resulting from ongoing audits and settlements | 4 |  |
France Tax Authority |  |  |
Income Tax Contingency [Line Items] |  |  |
Net operating loss carryforward | 30 |  |
Spain Tax Authority |  |  |
Income Tax Contingency [Line Items] |  |  |
Net operating loss carryforward | 18 |  |
Foreign Tax Authority |  |  |
Income Tax Contingency [Line Items] |  |  |
Release of valuation allowance |  | $ 8 | 6
Change in tax rates |  |  | $ 10
Domestic Tax Authority |  |  |
Income Tax Contingency [Line Items] |  |  |
Net operating loss carryforward | 0 |  |
State and Local Jurisdiction |  |  |
Income Tax Contingency [Line Items] |  |  |
Net operating loss carryforward | $ 23 |  |

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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 increase (decrease) in the income tax rates. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482525/740-10-45-15 + Details
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- Definition Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations attributable to deduction. Includes, but is not limited to, dividend deduction, deduction for dividend paid to employee stock ownership plan (ESOP), Medicare prescription drug benefit subsidy deduction, and other deductions. + References Reference 1: 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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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15 + Details
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