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Mortgage Servicing Rights and Related Liabilities - Narrative (Details) - USD ($) | 5 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Jul. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Servicing Assets at Fair Value [Line Items] |  |  |  |
Mortgage servicing liabilities | $ 71,000,000 |  | $ 71,000,000 |
MSL accretion | 15,000,000 |  |  |
Mortgage servicing rights at fair value | 3,665,000,000 |  | 3,665,000,000 |
Forward MSRs Sold |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |
Principal amount outstanding on mortgage servicing rights | 10,746,000,000 | $ 1,203,000,000 | 10,746,000,000 | $ 2,123,000,000
Forward MSRs Sold, Subservicing Retained |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |
Principal amount outstanding on mortgage servicing rights |  | 1,000,000 |  | 364,000,000
Reverse mortgage interests, net |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |
Principal amount outstanding on mortgage servicing rights | 28,415,000,000 |  | 28,415,000,000 | 35,112,000,000
Mortgage Servicing Right Liability |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |
Impairment |  | 56,000,000 |  | (3,000,000)
MSL accretion | 15,000,000 | 11,000,000 |  | 4,000,000
Mortgage Servicing Rights |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |
Principal amount outstanding on mortgage servicing rights | 295,481,000,000 |  | 295,481,000,000 |
Mortgage servicing liabilities | 71,000,000 |  | 71,000,000 |
Impairment |  |  | 0 | 0
Reverse MSRs - amortized cost | 11,000,000 |  | 11,000,000 |
Mortgage servicing rights at fair value | 3,665,000,000 |  | 3,665,000,000 |
Fair value of servicing liability, amortized cost | 53,000,000 |  | 53,000,000 | 34,000,000
Reverse Mortgage Servicing Rights |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |
Impairment |  | $ (4,000,000) |  |
Amortization | 4,000,000 |  |  | 2,000,000
Mortgage servicing rights at fair value | $ 11,000,000 |  | $ 11,000,000 | 29,000,000
Predecessor |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |
Mortgage servicing liabilities |  |  |  | 41,000,000
Mortgage servicing rights at fair value |  |  |  | 2,937,000,000
Predecessor | Mortgage Servicing Rights |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |
Principal amount outstanding on mortgage servicing rights |  |  |  | 281,380,000,000
Mortgage servicing liabilities |  |  |  | 41,000,000
Reverse MSRs - amortized cost |  |  |  | 4,000,000
Mortgage servicing rights at fair value |  |  |  | $ 2,937,000,000

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