Equity and Noncontrolling Interests - Schedule of Changes in Redeemable Noncontrolling Interest (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance	$ 342
Dividends	(8)	$ (4)
Ending balance	335
Redeemable Noncontrolling Interest
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance	240	43
Net income	13	6
Dividends	(31)	(14)
Change in redeemable noncontrolling interest	(186)	0
Foreign currency translation adjustments	5	7
Ending balance	$ 41	$ 42