Equity and Noncontrolling Interests - Schedule of Changes in Redeemable Noncontrolling Interest (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance			$ 342
Dividends	$ (3)	$ (29)	(19)	$ (40)
Change in redeemable noncontrolling interest		(3)		(3)
Ending balance	330		330
Redeemable Noncontrolling Interest
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance	48	44	240	43
Net income	4	6	26	19
Dividends	0	0	(33)	(14)
Change in redeemable noncontrolling interest	0	0	(186)	0
Foreign currency translation adjustments	(7)	(2)	(2)	0
Ending balance	$ 45	$ 48	$ 45	$ 48