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Fair Value Measurements - Reconciliation of Level 3 (Details) - Fair Value, Recurring - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Excess Spread Financing |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance - beginning of year | $ 934 | $ 1,311
Changes in fair value included in earnings | (10) | (194)
Purchases | 0 | 0
Equity consideration received | 0 |
Issuances | 0 | 24
Sales | 0 | 0
Settlements and repayments | (156) | (207)
Other changes | 0 | 0
Balance - end of year | 768 | 934
Mortgage Servicing Rights Financing |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance - beginning of year | 33 | 37
Changes in fair value included in earnings | (23) | (4)
Purchases | 0 | 0
Equity consideration received | 0 |
Issuances | 0 | 0
Sales | 0 | 0
Settlements and repayments | 0 | 0
Other changes | 0 | 0
Balance - end of year | 10 | 33
Forward Mortgage Servicing Rights |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance - beginning of year | 2,703 | 3,496
Changes in fair value included in earnings | (506) | (1,667)
Purchases | 948 | 124
Equity consideration received | 0 |
Issuances | 1,077 | 687
Sales | (55) | (9)
Settlements and repayments | 0 | 0
Other changes | 56 | (72)
Balance - end of year | 4,223 | 2,703
IRLCs |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance - beginning of year | 414 | 135
Changes in fair value included in earnings | (280) | 279
Purchases | 0 | 0
Equity consideration received | 0 |
Issuances | 0 | 0
Sales | 0 | 0
Settlements and repayments | 0 | 0
Other changes | 0 | 0
Balance - end of year | 134 | 414
LPCs |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance - beginning of year | 38 | 12
Changes in fair value included in earnings | (35) | 26
Purchases | 0 | 0
Equity consideration received | 0 |
Issuances | 0 | 0
Sales | 0 | 0
Settlements and repayments | 0 | 0
Other changes | 0 | 0
Balance - end of year | 3 | 38
Equity Securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance - beginning of year | 0 |
Changes in fair value included in earnings | (1) |
Purchases | 0 |
Equity consideration received | 55 |
Issuances | 0 |
Sales | 0 |
Settlements and repayments | 0 |
Other changes | 0 |
Balance - end of year | $ 54 | $ 0

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