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Fair Value (Nonrecurring) (Details) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets - gains (losses) | $ (303) | $ (49) | $ (140)
Level 3 | Nonaccrual loans |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets - gains (losses) | (287) | (4) | (111)
Level 3 | OREO and Foreclosed Assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets - gains (losses) |  |  | (2)
Level 3 | Equity investments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets | 135 |  |
Total assets - gains (losses) | (1) |  |
Level 3 | Long-lived Assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets | 23 | 103 |
Total assets - gains (losses) | (15) | (45) | $ (27)
Level 1 | Equity investments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets | 42 |  |
Fair Value of Property or Collateral | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets | 448 | 457 |
Fair Value of Property or Collateral | Level 3 | Nonaccrual loans |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets | 280 | 348 |
Fair Value of Property or Collateral | Level 3 | OREO and Foreclosed Assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets | $ 10 | $ 6 |

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