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Income Taxes - Differences between U.S. Federal Statutory Income Tax Rate and Income Taxes Provided (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
U.S. federal corporate statutory tax rate	21.00%	21.00%	24.50%
Taxes on income at the U.S. federal statutory rate	$ (94)	$ 56	$ 108
U.S. state and local taxes	2	2	7
Foreign income taxed at different rates, including withholding taxes	10	16	19
Increase in valuation allowance	1	1	4
Release of valuation allowance	(38)	(65)	(14)
Change in tax rates	4	(4)	23
Impact of GILTI and FDII	2	(4)	0
Intergroup transfer	0	0	(30)
IPO Costs	22	0	0
Executive Compensation	2	0	0
Non-deductible long term incentive plan	112	6	8
Other	0	1	5
Income tax expense	$ 23	$ 9	$ 130

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- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign income tax expense (benefit).

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Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to nondeductible expense for award under share-based payment arrangement. Includes, but is not limited to, expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.

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Income tax reconciliation foreign currency losses on intra-entity loans.

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