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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 2 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017
Operating Loss Carryforwards [Line Items] |  |
Statutory federal rate percentage | 21.00% | 35.00%
Deferred tax asset related to net operating loss carryforward | $ 990 |
Federal Net Operating Loss Carryforwards And Other Deferred Tax Assets |  |
Operating Loss Carryforwards [Line Items] |  |
Decrease in valuation allowance | $ 990 |

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