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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, 2019 | Dec. 31, 2018
Servicing Assets at Fair Value [Line Items] |  |  |  |
Mortgage servicing liabilities | $ 71,000,000 |  | $ 61,000,000 | $ 71,000,000
MSL accretion | (15,000,000) |  | (47,000,000) |
Mortgage servicing rights at fair value | 3,665,000,000 |  | 3,496,000,000 | 3,665,000,000
Forward MSRs Sold |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |
Unpaid principal balance sold | 10,746,000,000 | $ 1,203,000,000 | 35,152,000,000 |
Forward MSRs Sold, Subservicing Retained |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |
Principal amount outstanding on mortgage servicing rights | 0 | 1,000,000 | 20,560,000,000 | 0
Reverse mortgage interests |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |
Principal amount outstanding on mortgage servicing rights | 28,415,000,000 |  | 22,725,000,000 | 28,415,000,000
Mortgage Servicing Right Liability |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |
MSL accretion | (15,000,000) | (11,000,000) | (47,000,000) |
Impairment |  | 56,000,000 |  |
Mortgage Servicing Rights |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |
Principal amount outstanding on mortgage servicing rights | 295,481,000,000 |  | 296,782,000,000 | 295,481,000,000
Mortgage servicing liabilities | 71,000,000 |  | 61,000,000 | 71,000,000
Increase (decrease) servicing liability, amortized cost |  |  | 37,000,000 |
Impairment |  |  | 0 | 0
Reverse MSRs - amortized cost | 11,000,000 |  | 6,000,000 | 11,000,000
Fair value of servicing liability, amortized cost | 53,000,000 |  | 28,000,000 | 53,000,000
Mortgage servicing rights at fair value | 3,665,000,000 |  | 3,496,000,000 | 3,665,000,000
Reverse Mortgage Servicing Rights |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |
Impairment |  | $ 4,000,000 |  |
Amortization | (4,000,000) |  | (1,000,000) |
Other changes, servicing asset, amortized cost |  |  | 4,000,000 |
Mortgage servicing rights at fair value | $ 11,000,000 |  | $ 6,000,000 | $ 11,000,000

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