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Mortgage Servicing Rights ("MSRs") and Related Liabilities - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Servicing Asset at Amortized Cost [Line Items] |  |  |  |  |
Mortgage servicing liabilities - amortized cost | $ 80,000,000 |  | $ 80,000,000 |  | $ 71,000,000
Accretion of MSL | 11,000,000 |  | 29,000,000 |  |
Mortgage servicing rights at fair value | 3,505,000,000 |  | 3,505,000,000 |  | 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 | 17,000,000 | $ 22,000,000 | 28,000,000 | $ 34,000,000 |
Servicing fee income accretion expense | 59,000,000 | 37,000,000 | 95,000,000 | 67,000,000 |
Forward MSRs Sold |  |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |  |
UPB | 22,932,000,000 | 1,203,000,000 | 22,932,000,000 | 1,203,000,000 |
Forward MSRs Sold, Subservicing Retained |  |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |  |
UPB | 20,560,000,000 | $ 1,000,000 | 20,560,000,000 | 1,000,000 |
Reverse Mortgage Servicing Rights |  |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |  |
UPB | 25,569,000,000 |  | 25,569,000,000 |  | 28,415,000,000
Amortization of mortgage servicing rights |  |  | 1,000,000 |  |
Other MSR adjustments |  |  | 6,000,000 | 4,000,000 |
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 | 316,012,000,000 |  | 316,012,000,000 |  | 295,481,000,000
Mortgage servicing liabilities - amortized cost | 80,000,000 |  | 80,000,000 |  | 71,000,000
Accretion of MSL |  |  | 28,000,000 | 11,000,000 |
Other adjustments of MSL |  |  | 37,000,000 | $ 3,000,000 |
Mortgage servicing right at amortized cost | 6,000,000 |  | 6,000,000 |  | 11,000,000
Mortgage servicing rights at fair value | 3,505,000,000 |  | 3,505,000,000 |  | 3,665,000,000
Fair value of MSL | 44,000,000 |  | 44,000,000 |  | $ 53,000,000
Impairment |  |  | $ 0 |  |
Cumulative incurred losses related to advances and other receivables associated with inactive and liquidated loans | $ 17,000,000 |  |  |  |

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