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Derivative Instruments and Hedging Activities - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Cash flow hedges | $ 27 | $ 85 | $ 81
Interest Rate Swap [Member] | Cash Flow Hedging |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Cash flow hedges | 23 | 92 | $ 72
Net after-tax gain upon termination of contract |  | 41 |
Derivative, Notional Amount | $ 500 | $ 500 |

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- Definition Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss) Upon Termination Of Derivative Instrument, After Reclassification And Tax, Parent + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-1B Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-1A + Details
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- Definition Amount, after tax and reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness, attributable to parent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-11 + Details
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- Details
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