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Income Taxes - Current and Deferred Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Federal:
Current	$ 3	$ 0	$ 0
Deferred	(28)	(49)	91
Foreign:
Current	74	74	58
Deferred	(28)	(18)	(26)
U.S. State:
Current	3	3	6
Deferred	(1)	(1)	1
Income tax expense	23	9	130
Cash withholding taxes	$ 15	$ 17	$ 15

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