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Fair Value (Nonrecurring Fair Value Measurements) (Details) - Fair Value, Nonrecurring - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Nonrecurring Assets - Fair Value | $ 288 |  | $ 288 |  | $ 370
Nonrecurring Assets - Gains (Losses) | (4) | $ (34) |  |  |
Level 3 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Nonrecurring Assets - Gains (Losses) |  |  | (15) | $ (61) |
Level 3 | Nonaccrual loans |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Nonrecurring Assets - Fair Value | 266 |  | 266 |  | 332
Nonrecurring Assets - Gains (Losses) | 5 | (31) | (4) | (56) |
Level 3 | OREO and foreclosed assets |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Nonrecurring Assets - Fair Value | 4 |  | 4 |  | 18
Nonrecurring Assets - Gains (Losses) |  | (1) |  | (2) |
Level 3 | Long-lived assets |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Nonrecurring Assets - Fair Value | 18 |  | 18 |  | $ 20
Nonrecurring Assets - Gains (Losses) | $ (9) | $ (2) | $ (11) | $ (3) |

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