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Derivative Instruments and Hedging Activities - Schedule of Notional Amounts of Outstanding Derivative Positions (Detail) - USD ($) $ in Millions	Jun. 30, 2025	Sep. 30, 2024
Foreign Exchange Contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount of derivative	$ 2,457	$ 4,521
Foreign Exchange Contracts | Cash flow hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount of derivative	1,147	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	$ 3,180	$ 3,065

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