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Income Taxes - Additional Information (Details) - USD ($) | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Jul. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2016
Tax Credit Carryforward [Line Items] |  |  |  |  |  |
Deferred tax assets, NOL |  | $ 998,000,000 | $ 1,334,000,000 |  |  |
Unrecognized tax benefits | $ 17,000,000 | 0 | 0 | $ 0 |  | $ 0
Unrecognized tax benefits, uncertain tax positions | 19,000,000 |  |  |  |  |
Interest and penalties expense | $ 2,000,000 |  |  |  |  |
Unrecognized tax benefits, net effect |  |  |  |  | $ 6,000,000 |
WMIH Corp |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |
Operating loss carryforwards, valuation allowance |  | 285,000,000 |  |  |  |
Federal |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |
Operating loss carryforwards, valuation allowance |  | 9,000,000 |  |  |  |
Operating loss carryforwards |  | $ 4,700,000,000 | $ 6,300,000,000 |  |  |

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