Equity and Noncontrolling Interests - Schedule of Changes in Redeemable Noncontrolling Interest (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance	$ 318
Dividends	(4)	$ (4)
Ending balance	331
Foreign currency translation adjustments	134	95
Restatement Adjustment
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Net income	5
Redeemable Noncontrolling Interest
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance	57	45
Net income	13	7
Dividends	(21)	(18)
Foreign currency translation adjustments	8	11
Ending balance	$ 57	$ 45