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Fair Value Measures - Differences Between Aggregate Fair Value and Aggregate Remaining Contractual Principal Balance Outstanding - Fair Value Option (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Option, Quantitative Disclosures |  |
Unpaid Principal Balance | $ 871 | $ 1,095
Fair Value | 896 | 1,115
Fair Value Over / (Under) UPB | 25 | 20
Nonaccrual loans: |  |
Fair Value, Option, Quantitative Disclosures |  |
Unpaid Principal Balance | 2 |
Fair Value | 2 |
Fair Value, Option, Loans Held as Assets, Aggregate Amount in Nonaccrual Status, Aggregated Difference | 0 |
Other performing loans: |  |
Fair Value, Option, Quantitative Disclosures |  |
Unpaid Principal Balance | 869 | 1,095
Fair Value | 894 | 1,115
Fair Value Over / (Under) UPB |  | 20
Fair Value, Option, Loans Held as Assets, Aggregate Amount in Nonaccrual Status, Aggregated Difference | 25 |
Loans held-for-sale |  |
Fair Value, Option, Quantitative Disclosures |  |
Unpaid Principal Balance | 871 | 1,095
Fair Value | 896 | 1,115
Fair Value Over / (Under) UPB | 25 | 20
Loans held-for-sale | Nonaccrual loans: |  |
Fair Value, Option, Quantitative Disclosures |  |
Unpaid Principal Balance | 2 |
Fair Value | 2 |
Fair Value, Option, Loans Held as Assets, Aggregate Amount in Nonaccrual Status, Aggregated Difference | 0 |
Loans held-for-sale | Other performing loans: |  |
Fair Value, Option, Quantitative Disclosures |  |
Unpaid Principal Balance | 869 | 1,095
Fair Value | 894 | 1,115
Fair Value Over / (Under) UPB |  | $ 20
Fair Value, Option, Loans Held as Assets, Aggregate Amount in Nonaccrual Status, Aggregated Difference | $ 25 |

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