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Derivative Instruments and Hedging Activities Disclosure - Gains (Losses) on Net Investment Hedges (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Foreign currency translation adjustments	$ (109)	$ (166)	$ (91)
Foreign currency-denominated debt
Derivative Instruments, Gain (Loss) [Line Items]
Foreign currency translation adjustments	(107)	(96)	(155)
Currency Swap
Derivative Instruments, Gain (Loss) [Line Items]
Foreign currency translation adjustments	(18)	(71)	(70)
Terminated Currency Swap
Derivative Instruments, Gain (Loss) [Line Items]
Foreign currency translation adjustments	$ (42)	$ 9	$ 13

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