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Fair Value (Nonrecurring Fair Value Measurements) (Details) - Fair Value, Nonrecurring [Member] - Level 3 [Member] - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Nonrecurring Assets - Fair Value | $ 245 |  | $ 245 |  | $ 198
Nonrecurring Assets - Gains (Losses) | (34) | $ (40) | (61) | $ (52) |
Nonaccrual Loans [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Nonrecurring Assets - Fair Value | 211 |  | 211 |  | 136
Nonrecurring Assets - Gains (Losses) | (31) | (34) | (56) | (44) |
OREO and Foreclosed Assets [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Nonrecurring Assets - Fair Value | 30 |  | 30 |  | 57
Nonrecurring Assets - Gains (Losses) | (1) | (2) | (2) | (4) |
Long-lived Assets [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Nonrecurring Assets - Fair Value | 4 |  | 4 |  | $ 5
Nonrecurring Assets - Gains (Losses) | $ (2) | $ (4) | $ (3) | $ (4) |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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