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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, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Nonrecurring Assets - Fair Value | $ 265 |  | $ 265 |  | $ 370
Nonrecurring Assets - Gains (Losses) | (10) | $ (43) |  |  |
Level 3 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Nonrecurring Assets - Gains (Losses) |  |  | (38) | $ (82) |
Level 3 | Nonaccrual loans |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Nonrecurring Assets - Fair Value | 209 |  | 209 |  | 332
Nonrecurring Assets - Gains (Losses) | (3) | (38) | (3) | (73) |
Level 3 | OREO and foreclosed assets |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Nonrecurring Assets - Fair Value | 5 |  | 5 |  | 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 | 12 |  | 12 |  | $ 20
Nonrecurring Assets - Gains (Losses) | (6) | $ (4) | (17) | $ (7) |
Level 2 | Loans held for sale |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Nonrecurring Assets - Fair Value | 39 |  | 39 |  |
Nonrecurring Assets - Gains (Losses) | $ (1) |  | $ (18) |  |

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