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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, 2019 | Jul. 31, 2018 | Sep. 30, 2019 | Dec. 31, 2018
Servicing Asset at Amortized Cost [Line Items] |  |  |  |  |  |
Mortgage servicing liabilities - amortized cost |  |  | $ 69,000,000 |  | $ 69,000,000 | $ 71,000,000
Accretion of MSL |  |  | 10,000,000 |  | 39,000,000 |
Mortgage servicing rights at fair value |  |  | 3,339,000,000 |  | 3,339,000,000 | 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 |  | $ 13,000,000 | 18,000,000 |  | 46,000,000 |
Servicing fee income accretion expense |  | 22,000,000 | 77,000,000 |  | 172,000,000 |
Forward MSRs Sold |  |  |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |  |  |
UPB |  | 5,947,000,000 | 25,639,000,000 |  | 25,639,000,000 |
Forward MSRs Sold, Subservicing Retained |  |  |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |  |  |
UPB |  | 0 | 20,560,000,000 |  | 20,560,000,000 |
Reverse Mortgage Servicing Rights |  |  |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |  |  |
UPB |  |  | 23,990,000,000 |  | 23,990,000,000 | 28,415,000,000
Amortization of mortgage servicing rights |  | 1,000,000 |  |  | 2,000,000 |
Other MSR adjustments |  |  |  |  | 6,000,000 |
Mortgage servicing rights at fair value |  |  | 7,000,000 |  | 7,000,000 | 11,000,000
Mortgage servicing rights |  |  |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |  |  |
UPB |  |  | 306,681,000,000 |  | 306,681,000,000 | 295,481,000,000
Mortgage servicing liabilities - amortized cost |  |  | 69,000,000 |  | 69,000,000 | 71,000,000
Accretion of MSL |  | 7,000,000 |  |  | 39,000,000 |
Other adjustments of MSL |  |  |  |  | 37,000,000 |
Mortgage servicing right at amortized cost |  |  | 7,000,000 |  | 7,000,000 | 11,000,000
Mortgage servicing rights at fair value |  |  | 3,339,000,000 |  | 3,339,000,000 | 3,665,000,000
Fair value of MSL |  |  | 41,000,000 |  | 41,000,000 | $ 53,000,000
Impairment |  |  |  |  | 0 |
Cumulative incurred losses related to advances and other receivables associated with inactive and liquidated loans |  | 13,000,000 | $ 18,000,000 |  | $ 46,000,000 |
Nationstar Mortgage Holdings Inc. |  |  |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |  |  |
Cumulative incurred losses related to advances and other receivables associated with inactive and liquidated loans | $ 4,000,000 |  |  | $ 38,000,000 |  |
Servicing fee income accretion expense | 11,000,000 |  |  | 78,000,000 |  |
Nationstar Mortgage Holdings Inc. | Forward MSRs Sold |  |  |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |  |  |
UPB | 1,203,000,000 |  |  | 1,203,000,000 |  |
Nationstar Mortgage Holdings Inc. | Predecessor as Subservicer |  |  |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |  |  |
UPB |  | $ 1,000,000 |  |  |  |
Nationstar Mortgage Holdings Inc. | Reverse Mortgage Servicing Rights |  |  |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |  |  |
Other MSR adjustments |  |  |  | 4,000,000 |  |
Nationstar Mortgage Holdings Inc. | Mortgage servicing rights |  |  |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |  |  |
Accretion of MSL |  |  |  | 11,000,000 |  |
Other adjustments of MSL |  |  |  | 56,000,000 |  |
Cumulative incurred losses related to advances and other receivables associated with inactive and liquidated loans | $ 4,000,000 |  |  | $ 38,000,000 |  |

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