Equity and Noncontrolling Interests - Schedule of Changes in Redeemable Noncontrolling Interest (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Jun. 30, 2024	Sep. 30, 2023	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance				$ 318
Dividends	$ (39)		$ (30)	(57)	$ (36)
Ending balance	295	$ 318		295
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	58	57	55	57	45
Net income	7		7	27	23
Dividends	0		0	(21)	(18)
Foreign currency translation adjustments	(2)		(5)	0	7
Ending balance	$ 63	$ 57	$ 57	$ 63	$ 57