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Fair Value (Nonrecurring) (Details) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets - gains (losses) | $ (440) | $ (303) | $ (49)
Level 3 | Nonaccrual loans |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets - gains (losses) | (410) | (287) | (4)
Level 3 | OREO and Foreclosed Assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets - gains (losses) | (1) |  |
Level 3 | Equity investments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets | 203 | 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 | 9 | 23 |
Total assets - gains (losses) | (29) | (15) | $ (45)
Level 1 | Equity investments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets | 30 | 42 |
Fair Value of Property or Collateral | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets | 802 | 448 |
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 | 578 | 280 |
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 | $ 12 | $ 10 |

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