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Fair Value (Nonrecurring Fair Value Measurements) (Details) - Fair Value, Nonrecurring - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Nonrecurring Assets - Fair Value | $ 417 |  | $ 457
Nonrecurring Assets - Gains (Losses) | (31) | $ (36) |
Level 3 | Nonaccrual loans |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Nonrecurring Assets - Fair Value | 295 |  | 348
Nonrecurring Assets - Gains (Losses) | (24) | (17) |
Level 3 | Equity investments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Nonrecurring Assets - Fair Value | 112 |  |
Nonrecurring Assets - Gains (Losses) | (6) |  |
Level 3 | OREO and foreclosed assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Nonrecurring Assets - Fair Value | 2 |  | 6
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 | 8 |  | $ 103
Nonrecurring Assets - Gains (Losses) | $ (1) | (2) |
Level 2 | Loans held for sale |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Nonrecurring Assets - Gains (Losses) |  | $ (17) |

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