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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018 | Sep. 30, 2018
Income Tax Contingency [Line Items] |  |  |  |  |  |
Income tax provision (benefit) | $ 64 |  | $ (28) | $ 74 | $ 237 |
Effective tax rate (as percent) | 103.00% |  | 16.00% | 180.00% | 232.00% |
Federal statutory income tax rate (as percent) |  |  |  | 12.50% |  |
Change in valuation allowance on deferred tax asset | $ 43 |  |  |  |  |
Unrecognized tax benefits | 280 |  |  | $ 280 |  |
Unrecognized tax benefits that would impact effective tax rate | 131 |  |  | 131 |  |
Net accrued interest | 8 |  |  | $ 8 |  |
Change in valuation allowance |  | $ 100 |  |  |  |
Impairment charges on long-lived assets held-for-use | 66 |  |  |  |  |
Income tax benefit associated with impairment charges of long-lived asset | 2 |  |  |  |  |
Goodwill impairment charge | $ 299 |  | $ 299 |  |  |
Income tax benefit associated with goodwill impairment charges |  |  | $ 20 |  | $ 20 |
Foreign Tax Authority | GAAS |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Income tax benefit on reduction of deferred tax liability |  |  |  |  |  | $ 7
Foreign income tax rate differential (as percent) |  | 15.00% |  |  |  | 25.00%

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