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Income Taxes - Current and Deferred Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Federal:
Current	$ 23	$ 6	$ 3
Deferred	44	31	(28)
Foreign:
Current	128	107	74
Deferred	(30)	(5)	(28)
U.S. State:
Current	21	9	3
Deferred	(1)	1	(1)
Income tax expense	185	149	23
Cash withholding taxes	$ 27	$ 26	$ 15

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