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Equity and Noncontrolling Interests - Redeemable Noncontrolling Interest (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Stockholders' equity attributable to noncontrolling interest	$ 318
Dividends	(60)	$ (45)	$ (53)
Stockholders' equity attributable to noncontrolling interest	309	318
Restatement adjustment
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Net income	5
Redeemable noncontrolling interest
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Stockholders' equity attributable to noncontrolling interest	57	45	240
Net income	38	27	35
Dividends	(21)	(18)	(66)
Change in noncontrolling interest share	0	0	(153)
Foreign currency translation adjustments	17	3	(11)
Stockholders' equity attributable to noncontrolling interest	$ 91	$ 57	$ 45

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Amount of equity (deficit) attributable to noncontrolling interest. Excludes temporary equity.

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