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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2019 | Jun. 30, 2018
Income Tax Contingency [Line Items] |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  | 35.00% | 21.00% |
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount | $ 6 | $ 24 |  |  |  |
Increase (Decrease) in Deferred Income Taxes |  | 2 |  |  |  |
One-time transition tax liability, unfavorable tax adjustment | 6 | $ 22 |  |  |  |
Increase (Decrease) in Deferred Liabilities |  |  |  |  | $ 57 |
Minimum [Member] |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Decrease in Unrecognized Tax Benefits is Reasonably Possible | 2 |  |  |  | 2 |
Maximum [Member] |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Decrease in Unrecognized Tax Benefits is Reasonably Possible | $ 4 |  |  |  | $ 4 |
Current Fiscal Year [Member] |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Effective tax rate (in hundredths) | (5.00%) |  |  |  | 114.00% |
Current Fiscal Year [Member] | Foreign Country [Member] |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Income tax rate reconciliation, valuation allowances | $ (2) |  |  |  | $ 17 |
Prior Fiscal Year [Member] |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Effective tax rate (in hundredths) |  |  |  |  |  | (17.00%)
Prior Fiscal Year [Member] | State [Member] |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount |  |  | $ 5 |  |  |
Prior Fiscal Year [Member] | Foreign Country [Member] |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount |  |  | $ (6) |  |  |

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