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Fair Value of Assets and Liabilities - Gains/(losses) on Nonrecurring Fair Value Measurements (Details) - Non Recurring - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Net gains/(losses), loans and leases | $ (18) | $ (15) | $ (65) | $ (29)
Net gains/(losses), other assets | 0 | (1) | 0 | (5)
Gains (losses) on financial assets measured on non-recurring basis | (19) | (17) | (66) | (36)
SBAs |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Net gains/(losses), loans held for sale - SBAs and USDA | $ (1) | $ (1) | $ (1) | $ (2)

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- Definition Net gains or losses recognized in earnings on loans held for sale measured at fair value on a nonrecurring basis. + References No definition available. + Details
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