Derivative Instruments and Hedging Activities - Schedule of Effective Portion of Pretax Gains (Losses) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Total	$ (7)	$ (24)	$ (25)	$ (24)
Foreign currency exchange derivatives | Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gain (loss) on foreign currency exchange derivatives not designated as hedging instrument	(2)	0	(1)	(2)
Foreign currency exchange derivatives | Net financing charges
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gain (loss) on foreign currency exchange derivatives not designated as hedging instrument	(5)	(24)	(24)	(22)
Foreign currency exchange derivatives | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Foreign currency exchange derivatives	(6)	21	0	40
Foreign currency exchange derivatives | Cash Flow Hedging | Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Effective portion of pretax gain (loss) reclassified from AOCI into income	$ 2	$ 1	$ 5	$ (2)