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Income Taxes - Schedule of Current and Deferred Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Federal:
Current	$ 26	$ 36	$ 23
Deferred	(45)	(5)	44
Foreign:
Current	137	128	128
Deferred	3	(3)	(30)
U.S. State:
Current	8	19	21
Deferred	(6)	(5)	(1)
Income tax expense	123	170	185
Cash withholding taxes	$ 28	$ 38	$ 27

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Amount of current federal tax expense (benefit) attributable to income (loss) from continuing operations. Includes, but is not limited to, current national tax expense (benefit) for non-US (United States of America) jurisdiction.

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