Derivative Instruments and Hedging Activities Disclosure - Gains (Losses) on Net Investment Hedges (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recorded to Accumulated other comprehensive income (loss), net of tax	$ (80)	$ 41
Foreign Currency-Denominated Debt
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recorded to Accumulated other comprehensive income (loss), net of tax	(142)	49
Cross-Currency Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recorded to Accumulated other comprehensive income (loss), net of tax	$ (80)	$ 30