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Income Taxes (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023
Income Tax Disclosure [Abstract] |  |  |  |
Effective income tax rate reconciliation, percent (in percent) | 15.00% | 19.00% | 17.00% | 18.00%
Recognized tax benefit | $ 184,000,000 |  |  | $ 142,000,000
Decrease in unrecognized tax benefits, gross | 117,000,000 |  | $ 4,000,000 |
Decrease in unrecognized tax benefits, net | 159,000,000 |  | 130,000,000 |
Increase (decrease) interest accrued related to uncertain tax positions | $ 72,000,000 | $ 0 | $ 51,000,000 | $ 0

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + 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 + Details
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- Definition Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 25 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482620/740-10-25-8 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 25 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482620/740-10-25-10 + Details
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- Definition Increase (Decrease) In Unrecognized Tax Benefits, Interest On Income Taxes Accrued + References No definition available. + Details
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- Definition Unrecognized Tax Benefits, Decrease Resulting From Prior Period Tax Positions (Includes Reserve Assessment) + References No definition available. + Details
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- Definition Unrecognized Tax Benefits, Decrease Resulting From Prior Period Tax Positions, Net + References No definition available. + Details
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