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Fair Value (Nonrecurring Fair Value Measurements) (Details) - Fair Value, Nonrecurring - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022
Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Nonrecurring Assets - Fair Value | $ 405 |  | $ 448
Nonrecurring Assets - Gains (Losses) | (89) | $ (31) |
Level 3 | Nonaccrual loans |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Nonrecurring Assets - Fair Value | 310 |  | 280
Nonrecurring Assets - Gains (Losses) | (79) | (24) |
Level 3 | Equity investments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Nonrecurring Assets - Fair Value | 77 |  | 135
Nonrecurring Assets - Gains (Losses) | (5) | (6) |
Level 3 | OREO and foreclosed assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Nonrecurring Assets - Fair Value | 7 |  | 10
Nonrecurring Assets - Gains (Losses) |  |  |
Level 3 | Long-lived assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Nonrecurring Assets - Fair Value | 11 |  | 23
Nonrecurring Assets - Gains (Losses) | (5) | $ (1) |
Level 1 | Equity investments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Nonrecurring Assets - Fair Value | $ 37 |  | $ 42

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