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Income Taxes - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Tax Contingency [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	35.00%
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount	$ 24
Increase (Decrease) in Deferred Income Taxes	2
One-time transition tax liability, unfavorable tax adjustment	22
Increase (Decrease) in Deferred Liabilities	51
Minimum [Member]
Income Tax Contingency [Line Items]
Decrease in Unrecognized Tax Benefits is Reasonably Possible	0
Maximum [Member]
Income Tax Contingency [Line Items]
Decrease in Unrecognized Tax Benefits is Reasonably Possible	$ 2
Current Fiscal Year [Member]
Income Tax Contingency [Line Items]
Effective tax rate (in hundredths)	51.00%
Current Fiscal Year [Member] | Foreign Entity [Member]
Income Tax Contingency [Line Items]
Income tax rate reconciliation, valuation allowances	$ 30
Prior Fiscal Year [Member]
Income Tax Contingency [Line Items]
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount		$ 16
Effective tax rate (in hundredths)		45.00%

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

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