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Fair Value Measurements - Measured on a Recurring Basis (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
ASSETS |  |  |
Mortgage loans held for sale | $ 2,211 | $ 927 |
LIABILITIES |  |  |
Mortgage servicing rights financing | 32 | 29 |
Mortgage servicing rights |  |  |
ASSETS |  |  |
MSRs at fair value | 11,736 | 9,090 | $ 6,654
Recurring Fair Value Measurements |  |  |
ASSETS |  |  |
Mortgage loans held for sale | 2,211 | 927 |
MSRs at fair value | 11,736 | 9,090 |
Equity investments | 9 | 9 |
LIABILITIES |  |  |
Mortgage servicing rights financing | 32 | 29 |
Excess spread financing | 386 | 437 |
Recurring Fair Value Measurements | Mortgage servicing rights |  |  |
LIABILITIES |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 11,736 | 9,090 | $ 6,654
Recurring Fair Value Measurements | LPCs |  |  |
LIABILITIES |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 6 |  |
Recurring Fair Value Measurements | Level 1 |  |  |
ASSETS |  |  |
Mortgage loans held for sale | 0 | 0 |
MSRs at fair value | 0 | 0 |
Equity investments | 1 | 1 |
LIABILITIES |  |  |
Mortgage servicing rights financing | 0 | 0 |
Excess spread financing | 0 | 0 |
Recurring Fair Value Measurements | Level 2 |  |  |
ASSETS |  |  |
Mortgage loans held for sale | 2,151 | 846 |
MSRs at fair value | 0 | 0 |
Equity investments | 0 | 0 |
LIABILITIES |  |  |
Mortgage servicing rights financing | 0 | 0 |
Excess spread financing | 0 | 0 |
Recurring Fair Value Measurements | Level 3 |  |  |
ASSETS |  |  |
Mortgage loans held for sale | 60 | 81 |
MSRs at fair value | 11,736 | 9,090 |
Equity investments | 8 | 8 |
LIABILITIES |  |  |
Mortgage servicing rights financing | 32 | 29 |
Excess spread financing | 386 | 437 |
IRLCs | Recurring Fair Value Measurements |  |  |
ASSETS |  |  |
Fair Value | 22 | 21 |
IRLCs | Recurring Fair Value Measurements | Level 1 |  |  |
ASSETS |  |  |
Fair Value | 0 | 0 |
IRLCs | Recurring Fair Value Measurements | Level 2 |  |  |
ASSETS |  |  |
Fair Value | 0 | 0 |
IRLCs | Recurring Fair Value Measurements | Level 3 |  |  |
ASSETS |  |  |
Fair Value | 22 | 21 |
Forward MBS trades | Recurring Fair Value Measurements |  |  |
ASSETS |  |  |
Fair Value | 18 | 22 |
Fair Value | 95 | 9 |
Forward MBS trades | Recurring Fair Value Measurements | Level 1 |  |  |
ASSETS |  |  |
Fair Value | 0 | 0 |
Fair Value | 0 | 0 |
Forward MBS trades | Recurring Fair Value Measurements | Level 2 |  |  |
ASSETS |  |  |
Fair Value | 18 | 22 |
Fair Value | 95 | 9 |
Forward MBS trades | Recurring Fair Value Measurements | Level 3 |  |  |
ASSETS |  |  |
Fair Value | 0 | 0 |
Fair Value | 0 | 0 |
Treasury futures [Member] |  |  |
ASSETS |  |  |
Fair Value |  | 0 |
Treasury futures [Member] | Recurring Fair Value Measurements |  |  |
ASSETS |  |  |
Fair Value |  | 113 |
Fair Value | 59 |  |
Treasury futures [Member] | Recurring Fair Value Measurements | Level 1 |  |  |
ASSETS |  |  |
Fair Value |  | 0 |
Fair Value | 0 |  |
Treasury futures [Member] | Recurring Fair Value Measurements | Level 2 |  |  |
ASSETS |  |  |
Fair Value |  | 113 |
Fair Value | 59 |  |
Treasury futures [Member] | Recurring Fair Value Measurements | Level 3 |  |  |
ASSETS |  |  |
Fair Value |  | 0 |
Fair Value | 0 |  |
LPCs | Recurring Fair Value Measurements |  |  |
ASSETS |  |  |
Fair Value | 6 | 3 |
Fair Value | 7 |  |
LPCs | Recurring Fair Value Measurements | Level 1 |  |  |
ASSETS |  |  |
Fair Value | 0 | 0 |
Fair Value | 0 |  |
LPCs | Recurring Fair Value Measurements | Level 2 |  |  |
ASSETS |  |  |
Fair Value | 0 | 0 |
Fair Value | 0 |  |
LPCs | Recurring Fair Value Measurements | Level 3 |  |  |
ASSETS |  |  |
Fair Value | 6 | $ 3 |
Fair Value | $ 7 |  |

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