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Fair Value Measurements - Measured on a Recurring Basis (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Assets |  |
Mortgage loans held for sale | $ 6,961 | $ 5,720
Liabilities |  |
Mortgage servicing rights financing | 21 | 33
Recurring Fair Value Measurements |  |
Assets |  |
Mortgage loans held for sale | 6,961 | 5,720
Forward mortgage servicing rights | 3,307 | 2,703
Liabilities |  |
Mortgage servicing rights financing | 21 | 33
Excess spread financing | 867 | 934
Recurring Fair Value Measurements | IRLCs |  |
Assets |  |
Derivative asset, fair value | 204 | 414
Recurring Fair Value Measurements | Forward MBS trades |  |
Assets |  |
Derivative asset, fair value | 27 | 37
Liabilities |  |
Derivative financial instruments | 25 | 156
Recurring Fair Value Measurements | LPCs |  |
Assets |  |
Derivative asset, fair value | 10 | 38
Liabilities |  |
Derivative financial instruments | 1 | 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
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 2 |  |
Assets |  |
Mortgage loans held for sale | 6,961 | 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
Recurring Fair Value Measurements | Level 2 | Forward MBS trades |  |
Assets |  |
Derivative asset, fair value | 27 | 37
Liabilities |  |
Derivative financial instruments | 25 | 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 3 |  |
Assets |  |
Mortgage loans held for sale | 0 | 0
Forward mortgage servicing rights | 3,307 | 2,703
Liabilities |  |
Mortgage servicing rights financing | 21 | 33
Excess spread financing | 867 | 934
Recurring Fair Value Measurements | Level 3 | IRLCs |  |
Assets |  |
Derivative asset, fair value | 204 | 414
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 | 10 | 38
Liabilities |  |
Derivative financial instruments | $ 1 | $ 1

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