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Acquisitions - Acquisition of Nationstar Mortgage Holdings Inc (Details) $ / shares in Units, $ in Millions |  |  |  | 2 Months Ended | 3 Months Ended | 7 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 01, 2018 USD ($) | Jul. 31, 2018 USD ($) $ / shares shares | Jul. 13, 2018 USD ($) | Sep. 30, 2018 USD ($) | Mar. 31, 2019 USD ($) | Jul. 31, 2018 USD ($) $ / shares shares | Sep. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jul. 12, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 120 | $ 23 |
Reduction in payables and accrued liabilities |  |  |  | $ 159 |  |  | 69 |  |
Goodwill adjustment |  |  |  |  |  |  | 55 |  |
Nationstar Mortgage Holdings Inc. |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash consideration | $ 1,226 |  |  |  |  |  |  |  |
Estimated consideration | 1,777 |  |  |  |  |  |  |  |
Stock consideration | 551 |  |  |  |  |  |  |  |
Goodwill | $ 65 |  |  |  |  |  | 65 | $ 10 |
Reduction in reverse mortgage interests |  |  |  |  | $ 24 |  |  |  |
Reduction in reverse mortgage servicing rights |  |  |  |  | 6 |  |  |  |
Increase in mortgage servicing liabilities |  |  |  |  | 37 |  |  |  |
Reduction in payables and accrued liabilities |  |  |  |  | 12 |  |  |  |
Goodwill adjustment |  |  |  |  | 55 |  | $ 55 |  |
Accounting adjustments |  |  |  |  | 8 |  |  |  |
WMIH Corp And Wand Merger Corporation |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Right to receive in shares (in dollars per share) | $ / shares |  | $ 18 |  |  |  | $ 18 |  |  |
Right to receive in shares (shares) | shares |  | 12.7793 |  |  |  | 12.7793 |  |  |
Stock split conversion |  | 0.0833 |  |  |  |  |  |  |
Acquisition costs, incurred |  |  |  | $ 7 |  |  |  |  |
8.125% Due July 2023 |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Debt issued |  |  | $ 950 |  |  |  |  |  |
Interest rate |  |  | 8.125% |  |  |  |  |  |
9.125% Due July 2026 |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Debt issued |  |  | $ 750 |  |  |  |  |  |
Interest rate |  |  | 9.125% |  |  |  |  |  |
Service related, net revenue | Nationstar Mortgage Holdings Inc. |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Accounting adjustments |  |  |  |  | 7 |  |  |  |
Interest income | Nationstar Mortgage Holdings Inc. |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Accounting adjustments |  |  |  |  | $ 1 |  |  |  |
WMIH Corp | WMIH Corp And Wand Merger Corporation |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Acquisition costs |  |  |  |  |  |  |  |  | $ 92
Debt issuance costs |  |  |  |  |  |  |  |  | 38
WMIH Corp | KCM | WMIH Corp And Wand Merger Corporation |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Acquisition costs |  |  |  |  |  |  |  |  | 7
Payment for conversion fee |  |  | $ 8 |  |  |  |  |  |
WMIH Corp | KKR Capital Markets LLC | WMIH Corp And Wand Merger Corporation |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Acquisition costs |  |  |  |  |  |  |  |  | $ 25
Nationstar Mortgage Holdings Inc. |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Reduction in payables and accrued liabilities |  |  |  |  |  | $ (151) |  |  |
Nationstar Mortgage Holdings Inc. | WMIH Corp And Wand Merger Corporation |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Acquisition costs |  | $ 27 |  |  |  | $ 27 |  |  |

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