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Fair Value Measurements - Measured on a Recurring Basis (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Assets |  |
Mortgage loans held for sale | $ 6,351 | $ 5,720
Forward mortgage servicing rights | 3,354 | 2,703
Liabilities |  |
Mortgage servicing rights financing | 23 | 33
Recurring Fair Value Measurements |  |
Assets |  |
Mortgage loans held for sale | 6,351 | 5,720
Forward mortgage servicing rights | 3,354 | 2,703
Liabilities |  |
Mortgage servicing rights financing | 23 | 33
Excess spread financing | 934 | 934
Recurring Fair Value Measurements | IRLCs |  |
Assets |  |
Derivative asset, fair value | 232 | 414
Liabilities |  |
Derivative financial instruments | 1 |
Recurring Fair Value Measurements | Forward MBS trades |  |
Assets |  |
Derivative asset, fair value | 286 | 37
Liabilities |  |
Derivative financial instruments | 76 | 156
Recurring Fair Value Measurements | LPCs |  |
Assets |  |
Derivative asset, fair value | 8 | 38
Liabilities |  |
Derivative financial instruments | 38 | 1
Recurring Fair Value Measurements | Swap futures |  |
Liabilities |  |
Derivative financial instruments | 1 |
Recurring Fair Value Measurements | Level 1 |  |
Assets |  |
Mortgage loans held for sale | 0 | 0
Forward mortgage servicing rights | 0 | 0
Liabilities |  |
Mortgage servicing rights financing | 0 | 0
Excess spread financing | 0 | 0
Recurring Fair Value Measurements | Level 1 | IRLCs |  |
Assets |  |
Derivative asset, fair value | 0 | 0
Liabilities |  |
Derivative financial instruments | 0 |
Recurring Fair Value Measurements | Level 1 | Forward MBS trades |  |
Assets |  |
Derivative asset, fair value | 0 | 0
Liabilities |  |
Derivative financial instruments | 0 | 0
Recurring Fair Value Measurements | Level 1 | LPCs |  |
Assets |  |
Derivative asset, fair value | 0 | 0
Liabilities |  |
Derivative financial instruments | 0 | 0
Recurring Fair Value Measurements | Level 1 | Swap futures |  |
Liabilities |  |
Derivative financial instruments | 0 |
Recurring Fair Value Measurements | Level 2 |  |
Assets |  |
Mortgage loans held for sale | 6,351 | 5,720
Forward mortgage servicing rights | 0 | 0
Liabilities |  |
Mortgage servicing rights financing | 0 | 0
Excess spread financing | 0 | 0
Recurring Fair Value Measurements | Level 2 | IRLCs |  |
Assets |  |
Derivative asset, fair value | 0 | 0
Liabilities |  |
Derivative financial instruments | 0 |
Recurring Fair Value Measurements | Level 2 | Forward MBS trades |  |
Assets |  |
Derivative asset, fair value | 286 | 37
Liabilities |  |
Derivative financial instruments | 76 | 156
Recurring Fair Value Measurements | Level 2 | LPCs |  |
Assets |  |
Derivative asset, fair value | 0 | 0
Liabilities |  |
Derivative financial instruments | 0 | 0
Recurring Fair Value Measurements | Level 2 | Swap futures |  |
Liabilities |  |
Derivative financial instruments | 1 |
Recurring Fair Value Measurements | Level 3 |  |
Assets |  |
Mortgage loans held for sale | 0 | 0
Forward mortgage servicing rights | 3,354 | 2,703
Liabilities |  |
Mortgage servicing rights financing | 23 | 33
Excess spread financing | 934 | 934
Recurring Fair Value Measurements | Level 3 | IRLCs |  |
Assets |  |
Derivative asset, fair value | 232 | 414
Liabilities |  |
Derivative financial instruments | 1 |
Recurring Fair Value Measurements | Level 3 | Forward MBS trades |  |
Assets |  |
Derivative asset, fair value | 0 | 0
Liabilities |  |
Derivative financial instruments | 0 | 0
Recurring Fair Value Measurements | Level 3 | LPCs |  |
Assets |  |
Derivative asset, fair value | 8 | 38
Liabilities |  |
Derivative financial instruments | 38 | $ 1
Recurring Fair Value Measurements | Level 3 | Swap futures |  |
Liabilities |  |
Derivative financial instruments | $ 0 |

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