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Mortgage Servicing Rights ("MSRs") and Related Liabilities - Narrative (Details) - USD ($) | 1 Months Ended | 2 Months Ended | 3 Months Ended | 7 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jul. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Jul. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Servicing Asset at Amortized Cost [Line Items] |  |  |  |  |  |  |
Mortgage servicing liabilities - amortized cost |  | $ 79,000,000 |  |  | $ 79,000,000 |  |
Mortgage servicing rights |  | 3,500,000,000 |  |  | 3,500,000,000 |  |
Mortgage servicing rights at fair value |  | 3,485,000,000 |  |  | 3,485,000,000 |  |
Reclassification of earnings |  |  | $ 4,000,000 |  |  | $ 16,000,000 |
Cumulative incurred losses related to advances and other receivables associated with inactive and liquidated loans | $ 4,000,000 | 13,000,000 | 15,000,000 | $ 38,000,000 |  | 53,000,000 |
Servicing fee income accretion expense | $ 11,000,000 | 22,000,000 | $ 41,000,000 | 78,000,000 |  | 123,000,000 |
Reverse Mortgage Servicing Rights |  |  |  |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |  |  |  |
UPB |  | 30,660,000,000 |  |  | 30,660,000,000 |  | $ 35,112,000,000
Mortgage servicing rights |  | 15,000,000 |  |  | 15,000,000 |  | 4,000,000
Amortization of mortgage servicing rights |  | 1,000,000 |  |  |  | 1,000,000 |
Other MSR adjustments |  |  |  | 4,000,000 |  |  |
Mortgage servicing rights at fair value |  | 15,000,000 |  |  | 15,000,000 |  | 29,000,000
Mortgage servicing rights |  |  |  |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |  |  |  |
UPB |  | 274,486,000,000 |  |  | 274,486,000,000 |  |
Mortgage servicing liabilities - amortized cost |  | 79,000,000 |  |  | 79,000,000 |  |
Accretion of MSL |  | 7,000,000 |  | 11,000,000 |  | 1,000,000 |
Other adjustments of MSL |  |  |  | $ 56,000,000 |  | $ 6,000,000 |
Mortgage servicing rights |  | 3,500,000,000 |  |  | 3,500,000,000 |  |
Mortgage servicing rights at fair value |  | 3,485,000,000 |  |  | 3,485,000,000 |  |
Fair value of MSL |  | $ 60,000,000 |  |  | 60,000,000 |  | 34,000,000
Impairment |  |  |  |  | $ 0 |  |
Predecessor |  |  |  |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |  |  |  |
Mortgage servicing liabilities - amortized cost |  |  |  |  |  |  | 41,000,000
Mortgage servicing rights |  |  |  |  |  |  | 2,941,000,000
Mortgage servicing rights at fair value |  |  |  |  |  |  | 2,937,000,000
Predecessor | Mortgage servicing rights |  |  |  |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |  |  |  |
UPB |  |  |  |  |  |  | 281,380,000,000
Mortgage servicing liabilities - amortized cost |  |  |  |  |  |  | 41,000,000
Mortgage servicing rights |  |  |  |  |  |  | 2,941,000,000
Mortgage servicing rights at fair value |  |  |  |  |  |  | $ 2,937,000,000

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