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Fair Value (Nonrecurring Fair Value Measurements) (Details) - Fair Value, Nonrecurring - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Level 3 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Nonrecurring Assets - Fair Value | $ 433 |  | $ 433 |  | $ 448
Nonrecurring Assets - Gains (Losses) | (103) | $ (112) | (297) | $ (150) |
Level 3 | Nonaccrual loans |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Nonrecurring Assets - Fair Value | 361 |  | 361 |  | 280
Nonrecurring Assets - Gains (Losses) | (84) | (111) | (260) | (145) |
Level 3 | Equity investments |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Nonrecurring Assets - Fair Value | 57 |  | 57 |  | 135
Nonrecurring Assets - Gains (Losses) | (15) |  | (19) |  |
Level 3 | OREO and foreclosed assets |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Nonrecurring Assets - Fair Value | 11 |  | 11 |  | 10
Nonrecurring Assets - Gains (Losses) | (1) |  | (1) |  |
Level 3 | Long-lived assets |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Nonrecurring Assets - Fair Value | 4 |  | 4 |  | 23
Nonrecurring Assets - Gains (Losses) | (3) | $ (1) | (17) | $ (5) |
Level 1 | Equity investments |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Nonrecurring Assets - Fair Value | $ 28 |  | $ 28 |  | $ 42

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