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Derivative Instruments and Hedging Activities - Schedule of Notional Amounts of Outstanding Derivative Positions (Detail) - USD ($) $ in Millions | Dec. 31, 2024 | Sep. 30, 2024
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Foreign Exchange Contracts |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional amount of derivative | $ 2,366 | $ 4,521
Foreign Exchange Contracts | Cash flow hedges |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional amount of derivative | 394 | 543
Currency Swap | Net investment hedges |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional amount of derivative | 1,022 | 1,366
Interest Rate Swaps | Fair value hedges |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional amount of derivative | 700 | 700
Foreign Currency-Denominated Debt | Net investment hedges |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional amount of derivative | $ 2,874 | $ 3,065

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