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Derivative Instruments and Hedging Activities - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Cash flow hedges | $ 85 | $ 81 | $ (67)
Interest rate swaps | Cash Flow Hedging |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Cash flow hedges | 92 | 72 | $ (75)
Derivative, Notional Amount | 500 | 1,000 |
Net after-tax gain upon termination of contract | 41 |  |
Commodity forward contracts |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Derivative, Notional Amount | $ 0 | $ 0 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI https://asc.fasb.org/extlink&oid=126968391&loc=d3e637-108580 + Details
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