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Fair Value (Nonrecurring Fair Value Measurements) (Details) - Fair Value, Nonrecurring - Level 3 - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value | $ 683 |  | $ 683 |  | $ 853
Gains (Losses) | (44) | $ (188) | (99) | $ (254) |
Nonaccrual loans |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value | 519 |  | 519 |  | 629
Gains (Losses) | (38) | (192) | (93) | (245) |
Equity investments |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value | 154 |  | 154 |  | 198
Gains (Losses) | (2) | 8 | (2) | (1) |
OREO and foreclosed assets |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value | 5 |  | 5 |  | 8
Gains (Losses) | (1) | (1) | (1) | (2) |
Long-lived assets |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value | 5 |  | 5 |  | $ 18
Gains (Losses) | $ (3) | $ (3) | $ (3) | $ (6) |

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