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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, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Net gains/(losses), loans and leases | $ (17) | $ (18) | $ (49) | $ (65)
Gains (losses) on financial assets measured on non-recurring basis | (18) | (19) | (50) | (66)
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) | $ (1)

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