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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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