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Derivative Instruments and Hedging Activities - Schedule of Notional Amounts of Outstanding Derivative Positions (Detail) - USD ($) $ in Millions | Jun. 30, 2024 | Sep. 30, 2023
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Foreign Exchange Contracts |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional amount of derivative | $ 2,513 | $ 3,146
Cross-currency swaps (a) | Net investment hedges |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional amount of derivative | 1,366 | 2,119
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 | 0 | 500
Foreign Currency-Denominated Debt | Net investment hedges |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional amount of derivative | $ 2,938 | $ 1,056

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