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Fair Value (Nonrecurring Fair Value Measurements) (Details) - Fair Value, Nonrecurring - Level 3 - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value | $ 649 |  | $ 649 |  | $ 853
Gains (Losses) | (83) | $ (180) | (162) | $ (342) |
Nonaccrual loans |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value | 523 |  | 523 |  | 629
Gains (Losses) | (66) | (180) | (142) | (333) |
Equity investments |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value | 74 |  | 74 |  | 198
Gains (Losses) | 0 | 1 | (1) | (1) |
OREO, foreclosed and other assets |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value | 47 |  | 47 |  | 8
Gains (Losses) | (14) | 0 | (14) | (1) |
Long-lived assets |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value | 5 |  | 5 |  | 18
Gains (Losses) | (1) | (1) | (3) | (7) |
Loans held for sale |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value | 0 |  | 0 |  | $ 0
Gains (Losses) | $ (2) | $ 0 | $ (2) | $ 0 |

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