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Derivative Instruments and Hedging Activities - Schedule of Notional Amounts of Outstanding Derivative Positions (Detail) - USD ($) $ in Millions | Mar. 31, 2022 | Sep. 30, 2021
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Foreign Exchange Contracts |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional amount of derivative | $ 1,486 | $ 2,735
Cross-Currency Swaps | Net investment hedges |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional amount of derivative | 1,958 | 1,958
Interest Rate Swaps | Fair value hedges |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional amount of derivative | 700 | 700
Forward Starting Interest Rate Swaps | Cash flow hedges |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional amount of derivative | 1,000 | 1,000
Foreign Currency-Denominated Debt | Net investment hedges |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional amount of derivative | $ 2,419 | $ 2,543

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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 http://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 http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959 + Details
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