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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, 2019
Excess spread financing |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance - beginning of period | $ 1,039 |  | $ 1,184
Total gains or losses included in earnings | 26 |  | (190)
Payments received from borrowers | 0 |  | 0
Purchases | 0 |  | 0
Issuances | 84 |  | 469
Sales | 0 |  | 0
Repayments | (21) |  | (19)
Settlements | (31) |  | (163)
Balance - end of period | 1,097 | $ 1,039 | 1,281
Mortgage servicing rights financing |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance - beginning of period | 26 |  | 32
Total gains or losses included in earnings | 0 |  | 15
Payments received from borrowers | 0 |  | 0
Purchases | 0 |  | 0
Issuances | 0 |  | 0
Sales | 0 |  | 0
Repayments | 0 |  | 0
Settlements | 0 |  | 0
Balance - end of period | 26 | 26 | 47
Mortgage servicing rights |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance - beginning of period | 3,413 |  | 3,665
Total gains or losses included in earnings | 20 |  | (1,039)
Payments received from borrowers | 0 |  | 0
Purchases | 72 |  | 732
Issuances | 43 |  | 298
Sales | (63) |  | (317)
Repayments | 0 |  | 0
Settlements | 0 |  | 0
Transfers to mortgage loans held for sale |  |  | 0
Transfers to real estate owned |  |  | 0
Balance - end of period | 3,485 | 3,413 | 3,339
Mortgage loans held for investment |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance - beginning of period | 125 |  | 119
Total gains or losses included in earnings | (1) |  | 3
Payments received from borrowers | (2) |  | (11)
Purchases | 0 |  | 0
Issuances | 0 |  | 0
Sales | 0 |  | (94)
Repayments | 0 |  | 0
Settlements | 0 |  | 0
Transfers to mortgage loans held for sale |  |  | (12)
Transfers to real estate owned |  |  | (5)
Balance - end of period | 122 | 125 | $ 0
Nationstar Mortgage Holdings Inc. | Excess spread financing |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance - beginning of period | 1,039 | 996 |
Total gains or losses included in earnings |  | 81 |
Purchases |  | 0 |
Issuances |  | 70 |
Sales |  | 0 |
Repayments |  | (3) |
Settlements |  | (105) |
Balance - end of period |  | 1,039 |
Nationstar Mortgage Holdings Inc. | Mortgage servicing rights financing |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance - beginning of period | 26 | 10 |
Total gains or losses included in earnings |  | 16 |
Purchases |  | 0 |
Issuances |  | 0 |
Sales |  | 0 |
Repayments |  | 0 |
Settlements |  | 0 |
Balance - end of period |  | 26 |
Nationstar Mortgage Holdings Inc. | Mortgage servicing rights |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance - beginning of period | $ 3,413 | 2,937 |
Total gains or losses included in earnings |  | 166 |
Purchases |  | 144 |
Issuances |  | 162 |
Sales |  | 4 |
Repayments |  | 0 |
Settlements |  | 0 |
Balance - end of period |  | $ 3,413 |

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