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Fair Value Measurements - Total Gains and Losses Included in Earning Attributable to Changes in Unrealized Gains and Losses Related to Level 3 Assets and Liabilities Still Held at Year End (Details) - Level 3 - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Gain and losses included in earnings | $ (45) | $ 11
Mortgage banking net revenue |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Gain and losses included in earnings | (28) | 27
Capital markets fees |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Gain and losses included in earnings | 1 | 1
Other noninterest income |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Gain and losses included in earnings | $ (18) | $ (17)

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