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Derivative Instruments and Hedging Activities - Schedule of Notional Amounts of Outstanding Derivative Positions (Detail) - USD ($) $ in Millions	Sep. 30, 2025	Sep. 30, 2024
Debt | Net investment hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	$ 2,630	$ 3,065
Foreign currency-denominated debt
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	5,710	4,521
Foreign currency-denominated debt | Cash flow hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	1,170	543
Currency Swap | Net investment hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	1,054	1,366
Fixed To Floating | Fair value hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	$ 700	$ 700

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