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Fair Value (Nonrecurring Fair Value Measurements) (Details) - Fair Value, Nonrecurring - Level 3 - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Nonrecurring Assets - Fair Value | $ 253 |  | $ 253 |  | $ 457
Nonrecurring Assets - Gains (Losses) | (112) | $ (10) | (150) | $ (38) |
Nonaccrual loans |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Nonrecurring Assets - Fair Value | 211 |  | 211 |  | 348
Nonrecurring Assets - Gains (Losses) | (111) | (3) | (145) | (3) |
Equity investments |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Nonrecurring Assets - Fair Value | 30 |  | 30 |  |
Nonrecurring Assets - Gains (Losses) |  |  |  |  |
Loans held for sale |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Nonrecurring Assets - Gains (Losses) |  | (1) |  | (18) |
OREO and foreclosed assets |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Nonrecurring Assets - Fair Value | 9 |  | 9 |  | 6
Nonrecurring Assets - Gains (Losses) |  |  |  |  |
Long-lived assets |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Nonrecurring Assets - Fair Value | 3 |  | 3 |  | $ 103
Nonrecurring Assets - Gains (Losses) | $ (1) | $ (6) | $ (5) | $ (17) |

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