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Income Taxes - Summary of Provision for Income Taxes Related to Continuing Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Current
Federal	$ (2)	$ 20	$ (26)
State	(7)	(2)	(1)
Foreign	35	74	37
Total current income tax expense (benefit)	26	92	10
Deferred	20	(100)	(26)
Income tax expense (benefit)	$ 46	$ (8)	$ (16)

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Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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