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Fair Value Measurements - Reconciliation of Level 3 (Details) - Fair Value, Recurring - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Excess Spread Financing |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance - beginning of year | $ 1,311 | $ 1,184
Total gains or losses included in earnings | (194) | (169)
Payments received from borrowers |  | 0
Purchases, issuances, sales, repayments and settlements |  |
Purchases | 0 | 0
Issuances | 24 | 542
Sales | 0 | 0
Settlements and repayments | (207) | (246)
Transfers to mortgage loans held for sale |  | 0
Transfers to real estate owned |  | 0
Balance - end of year | 934 | 1,311
Mortgage Servicing Rights Financing |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance - beginning of year | 37 | 32
Total gains or losses included in earnings | (4) | 5
Payments received from borrowers |  | 0
Purchases, issuances, sales, repayments and settlements |  |
Purchases | 0 | 0
Issuances | 0 | 0
Sales | 0 | 0
Settlements and repayments | 0 | 0
Transfers to mortgage loans held for sale |  | 0
Transfers to real estate owned |  | 0
Balance - end of year | 33 | 37
Forward Mortgage Servicing Rights |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance - beginning of year | 3,496 | 3,665
Total gains or losses included in earnings | (1,595) | (1,053)
Payments received from borrowers |  | 0
Purchases, issuances, sales, repayments and settlements |  |
Purchases | 124 | 858
Issuances | 687 | 434
Sales | (9) | (408)
Settlements and repayments | 0 | 0
Transfers to mortgage loans held for sale |  | 0
Transfers to real estate owned |  | 0
Balance - end of year | 2,703 | 3,496
IRLCs |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance - beginning of year | 135 |
Total gains or losses included in earnings | 279 |
Purchases, issuances, sales, repayments and settlements |  |
Purchases | 0 |
Issuances | 0 |
Sales | 0 |
Settlements and repayments | 0 |
Balance - end of year | 414 | 135
LPCs |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance - beginning of year | 12 |
Total gains or losses included in earnings | 26 |
Purchases, issuances, sales, repayments and settlements |  |
Purchases | 0 |
Issuances | 0 |
Sales | 0 |
Settlements and repayments | 0 |
Balance - end of year | 38 | 12
Mortgage Loans Held for Investment |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance - beginning of year | $ 0 | 119
Total gains or losses included in earnings |  | 3
Payments received from borrowers |  | (11)
Purchases, issuances, sales, repayments and settlements |  |
Purchases |  | 0
Issuances |  | 0
Sales |  | (94)
Settlements and repayments |  | 0
Transfers to mortgage loans held for sale |  | (12)
Transfers to real estate owned |  | (5)
Balance - end of year |  | $ 0

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