Income Taxes (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2026 |
Mar. 31, 2025 |
Sep. 30, 2025 |
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| Income Tax Disclosure [Abstract] | |||||
| Effective income tax rate | 20.20% | 17.10% | 16.50% | 16.80% | |
| Income tax liabilities | $ 97 | $ 97 | |||
| Gross unrecognized tax benefits | 28 | 28 | $ 29 | ||
| Accrued interest and penalties related to unrecognized tax benefits | 3 | 3 | $ 2 | ||
| Reasonably possible amount of reduction in gross unrecognized tax benefits for the next twelve months | 22 | 22 | |||
| Reasonably possible amount of net reduction to income tax provision if unrecognized tax benefits were recognized | $ 23 | $ 23 | |||
| X | ||||||||||
- Definition Net reduction to income tax provision, including the recognition of interest and penalties and offsetting tax assets, if unrecognized tax benefits were recognized. No definition available.
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| X | ||||||||||
- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date. Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
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| X | ||||||||||
- Definition Amount of tax liability from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act, classified as noncurrent. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount of unrecognized tax benefits. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- 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. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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