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Derivative Instruments and Hedging Activities - Schedule of Notional Amounts of Outstanding Derivative Positions (Detail) - USD ($) $ in Millions | Sep. 30, 2022 | Sep. 30, 2021
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Debt | Net Investment Hedging |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative, Notional Amount | $ 2,140 | $ 2,543
Forward exchange contracts |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative, Notional Amount | 2,766 | 2,735
Currency Swap | Net Investment Hedging |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative, Notional Amount | 910 | 1,958
Fixed To Floating | Fair Value Hedging |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative, Notional Amount | 700 | 700
Interest rate swaps | Cash Flow Hedging |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative, Notional Amount | $ 500 | $ 1,000

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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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