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Acquisitions - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | Aug. 01, 2018 | Jul. 13, 2018 | Feb. 12, 2018 | Sep. 30, 2018 | Jul. 31, 2018 | Jul. 12, 2018
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Business Acquisition [Line Items] |  |  |  |  |  |
Common stock, par value (in dollars per share) |  |  |  | $ 0.01 |  |
WMIH Corp And Wand Merger Corporation |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Right to receive in cash (in dollars per share) |  |  | $ 18.00 |  |  |
Right to receive in shares (shares) |  |  | 12.7793 |  |  |
Common stock, par value (in dollars per share) |  |  | $ 0.00001 |  |  |
Cash consideration |  |  | $ 1,226 |  |  |
Acquisition costs |  |  |  |  |  | $ 92
Debt issuance costs |  |  |  |  |  | 38
Nationstar Mortgage Holdings Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash consideration | $ 1,226 |  |  |  |  |
Estimated consideration | 1,777 |  |  |  |  |
Stock consideration | 551 |  |  |  |  |
Bargain purchase amount | 2 |  |  |  |  |
Intangible assets acquired | 103 |  |  |  |  |
Nationstar Mortgage Holdings Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition costs |  |  |  | $ 7 | $ 27 |
Xome Holdings LLC | Assurant Mortgage Solutions Group |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash consideration | 35 |  |  |  |  |
Intangible assets acquired | 23 |  |  |  |  |
Goodwill acquired | $ 3 |  |  |  |  |
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% |  |  |  |
KKR Capital Markets LLC | WMIH Corp And Wand Merger Corporation |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition costs |  |  |  |  |  | 25
KCM | WMIH Corp And Wand Merger Corporation |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition costs |  |  |  |  |  | $ 7
Payment for conversion fee |  | $ 8 |  |  |  |

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