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Mortgage Servicing Rights ("MSRs") and Related Liabilities - Narrative (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Servicing Asset at Amortized Cost [Line Items] |  |  |
Mortgage servicing liabilities - amortized cost | $ 90,000,000 |  | $ 71,000,000
Mortgage servicing rights at fair value | 3,481,000,000 |  | 3,665,000,000
Clean up call option | 21,000,000 |  |
Cumulative incurred losses related to advances and other receivables associated with inactive and liquidated loans | 11,000,000 |  |
Servicing fee income accretion expense | 36,000,000 |  |
Forward MSRs Sold |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |
UPB | 19,409,000,000 |  |
Forward MSRs Sold, Subservicing Retained |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |
UPB | 19,276,000,000 |  |
Reverse Mortgage Servicing Rights |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |
UPB | 27,014,000,000 |  | 28,415,000,000
Amortization of mortgage servicing rights | 2,000,000 |  |
Other MSR adjustments | 6,000,000 |  |
Mortgage servicing rights at fair value | 7,000,000 |  | 11,000,000
Mortgage servicing rights |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |
UPB | 303,692,000,000 |  | 295,481,000,000
Mortgage servicing liabilities - amortized cost | 90,000,000 |  | 71,000,000
Accretion of MSL | 18,000,000 |  |
Other adjustments of MSL | 37,000,000 |  |
Mortgage servicing right at amortized cost | 7,000,000 |  | 11,000,000
Mortgage servicing rights at fair value | 3,481,000,000 |  | 3,665,000,000
Fair value of MSL | 75,000,000 |  | $ 53,000,000
Impairment | $ 0 |  |
Predecessor |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |
Cumulative incurred losses related to advances and other receivables associated with inactive and liquidated loans |  | $ 12,000,000 |
Servicing fee income accretion expense |  | 30,000,000 |
Predecessor | Reverse Mortgage Servicing Rights |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |
Other MSR adjustments |  | 4,000,000 |
Predecessor | Mortgage servicing rights |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |
Accretion of MSL |  | 8,000,000 |
Other adjustments of MSL |  | $ 3,000,000 |

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