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Derivative Instruments and Hedging Activities - Gains (Losses) on Net Investment Hedges (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recorded to Accumulated other comprehensive income (loss), net of tax	$ (114)	$ (53)	$ (116)	$ (54)
Foreign currency-denominated debt
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recorded to Accumulated other comprehensive income (loss), net of tax	(166)	24	(85)	(1)
Currency Swap
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recorded to Accumulated other comprehensive income (loss), net of tax	$ (57)	10	(10)	(24)
Terminated Currency Swap
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recorded to Accumulated other comprehensive income (loss), net of tax		$ 9	$ (18)	$ 9

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