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Fair Value Measurements - Level 3 Reconciliation (Details) - USD ($) $ in Millions | 2 Months Ended | 7 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Jul. 31, 2018 | Sep. 30, 2017
Excess spread financing |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance - beginning of period | $ 1,039 |  |
Total gains or losses included in earnings | 26 |  |
Purchases | 0 |  |
Issuances | 84 |  |
Sales | 0 |  |
Settlements | (31) |  |
Repayments | 21 |  |
Balance - end of period | 1,097 | $ 1,039 |
Mortgage servicing rights financing |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance - beginning of period | 26 |  |
Total gains or losses included in earnings | 0 |  |
Purchases | 0 |  |
Issuances | 0 |  |
Sales | 0 |  |
Settlements | 0 |  |
Repayments | 0 |  |
Balance - end of period | 26 | 26 |
Mortgage servicing rights |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance - beginning of period | 3,413 |  |
Total gains or losses included in earnings | 20 |  |
Purchases | 72 |  |
Issuances | 43 |  |
Sales | (63) |  |
Settlements | 0 |  |
Repayments | 0 |  |
Balance - end of period | 3,485 | 3,413 |
Predecessor | Excess spread financing |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance - beginning of period | 1,039 | 996 | $ 1,214
Total gains or losses included in earnings |  | 81 | 0
Purchases |  | 0 | 0
Issuances |  | 70 | 0
Sales |  | 0 | 0
Settlements |  | (105) | (159)
Repayments |  | 3 | 9
Balance - end of period |  | 1,039 | 1,046
Predecessor | Mortgage servicing rights financing |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance - beginning of period | 26 | 10 | 27
Total gains or losses included in earnings |  | 16 | (7)
Purchases |  | 0 | 0
Issuances |  | 0 | 0
Sales |  | 0 | 0
Settlements |  | 0 | 0
Repayments |  |  | 0
Balance - end of period |  | 26 | 20
Predecessor | Mortgage servicing rights |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance - beginning of period | $ 3,413 | 2,937 | 3,160
Total gains or losses included in earnings |  | 166 | (361)
Purchases |  | 144 | 30
Issuances |  | 162 | 151
Sales |  | 4 | (24)
Settlements |  | 0 | 0
Repayments |  | 0 | 0
Balance - end of period |  | $ 3,413 | $ 2,956

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