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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, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Level 3 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Nonrecurring Assets - Fair Value | $ 858 |  | $ 858 |  | $ 802
Nonrecurring Assets - Gains (Losses) | (180) | $ (103) | (342) | $ (297) |
Level 3 | Nonaccrual loans |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Nonrecurring Assets - Fair Value | 795 |  | 795 |  | 578
Nonrecurring Assets - Gains (Losses) | (180) | (84) | (333) | (260) |
Level 3 | Equity investments |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Nonrecurring Assets - Fair Value | 47 |  | 47 |  | 203
Nonrecurring Assets - Gains (Losses) | 1 | (15) | (1) | (19) |
Level 3 | OREO and foreclosed assets |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Nonrecurring Assets - Fair Value | 7 |  | 7 |  | 12
Nonrecurring Assets - Gains (Losses) |  | (1) | (1) | (1) |
Level 3 | Long-lived assets |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Nonrecurring Assets - Fair Value | 9 |  | 9 |  | 9
Nonrecurring Assets - Gains (Losses) | $ (1) | $ (3) | $ (7) | $ (17) |
Level 1 | Equity investments |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Nonrecurring Assets - Fair Value |  |  |  |  | $ 30

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