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Fair Value Measurements - Fair Values of Assets and Liabilities (Significant Unobservable Level 3 Inputs Recurring Basis) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Derivative Assets | $ 2,190 |  | $ 2,472
Derivative liabilities | (2,485) |  | (2,798)
Servicing rights |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Servicing rights | $ 1,663 | $ 1,756 |
Servicing rights | Minimum |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Prepayment speed | 0.00% | 0.00% |
OAS (bps) | 0.0335 | 0.0448 |
Servicing rights | Maximum |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Prepayment speed | 100.00% | 100.00% |
OAS (bps) | 0.1821 | 0.1833 |
Servicing rights | Fixed | Weighted-Average |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Prepayment speed | 6.30% | 5.80% |
OAS (bps) | 0.0418 | 0.0460 |
Servicing rights | Adjustable | Weighted-Average |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Prepayment speed | 16.00% | 22.90% |
OAS (bps) | 0.0725 | 0.0702 |
IRLCs, net |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Derivative Assets | $ 5 | $ 5 |
IRLCs, net | Minimum |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Loan closing rates | 20.50% | 20.00% |
IRLCs, net | Maximum |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Loan closing rates | 96.00% | 96.00% |
IRLCs, net | Weighted-Average |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Loan closing rates | 79.70% | 79.40% |
Swap |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Derivative liabilities | $ (173) | $ (162) |
Swap | Minimum |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Timing of the resolution of the Covered Litigation | Jun. 30, 2027 | Jun. 30, 2026 |
Swap | Maximum |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Timing of the resolution of the Covered Litigation | Mar. 31, 2028 | Mar. 31, 2028 |
Swap | Weighted-Average |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Timing of the resolution of the Covered Litigation | Dec. 31, 2027 | Dec. 31, 2026 |
Residential Mortgage |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Loans measured at FV | $ 109 | $ 113 | $ 108
Residential Mortgage | Minimum |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Interest rate risk factor | (51.90%) | (25.20%) |
Credit risk factor | 0.00% | 0.00% |
Residential Mortgage | Maximum |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Interest rate risk factor | 5.70% | 3.70% |
Credit risk factor | 0.70% | 0.60% |
Residential Mortgage | Weighted-Average |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Interest rate risk factor | (11.50%) | (13.40%) |
Credit risk factor | 0.10% | 0.10% |

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