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Derivative Instruments and Hedging Activities - Schedule of Notional Amounts of Outstanding Derivative Positions (Detail) - USD ($) $ in Millions | Sep. 30, 2023 | Sep. 30, 2022
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Debt | Net Investment Hedging |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative, Notional Amount | $ 1,056 | $ 2,140
Foreign Exchange Contract [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative, Notional Amount | 3,146 | 2,766
Currency Swap | Net Investment Hedging |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative, Notional Amount | 2,119 | 910
Fixed To Floating | Fair Value Hedging |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative, Notional Amount | 700 | 700
Interest Rate Swap [Member] | Cash Flow Hedging |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative, Notional Amount | $ 500 | $ 500

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