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Subsequent Events (Narrative) (Details) - $ / shares | May 07, 2024 | Apr. 05, 2024 | Jun. 10, 2020 | Nov. 21, 2019 | May 02, 2024 | Mar. 31, 2024 | Dec. 31, 2023
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Subsequent Event [Line Items] |  |  |  |  |  |  |
Common stock, par value (dollars per share) |  |  |  |  |  | $ 1 | $ 1
Depositary Shares, each representing a 1/1,000th interest in a share of 6.625% Fixed-Rate Reset Non-Cumulative Preferred Stock, Series B |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  | 6.625% |  |  |  |
Preferred stock, par value (dollars per share) |  |  | $ 1.00 |  |  | 1 | 1
Depositary Shares, each representing a 1/1,000th interest in a share of 5.95% Fixed-Rate Reset Non-Cumulative Preferred Stock, Series A |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  |  | 5.95% |  |  |
Preferred stock, par value (dollars per share) |  |  |  | $ 1.00 |  | $ 1 | $ 1
Subsequent Event |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Common stock dividend declared, per share |  | $ 0.38 |  |  |  |  |
Subsequent Event | Depositary Shares, each representing a 1/1,000th interest in a share of 6.625% Fixed-Rate Reset Non-Cumulative Preferred Stock, Series B |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Preferred stock dividends declared, per share | $ 414.0625000 |  |  |  |  |  |
Preferred stock dividends declared, per depositary share | $ 0.414062500 |  |  |  |  |  |
Preferred stock, dividend rate, percentage | 6.625% |  |  |  |  |  |
Preferred stock, par value (dollars per share) | $ 1.00 |  |  |  |  |  |
Subsequent Event | Depositary Shares, each representing a 1/1,000th interest in a share of 5.95% Fixed-Rate Reset Non-Cumulative Preferred Stock, Series A |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Preferred stock dividends declared, per share | 371.8750000 |  |  |  |  |  |
Preferred stock dividends declared, per depositary share | $ 0.371875000 |  |  |  |  |  |
Preferred stock, dividend rate, percentage | 5.95% |  |  |  |  |  |
Preferred stock, par value (dollars per share) | $ 1.00 |  |  |  |  |  |
Subsequent Event | Brookfield Reinsurance Ltd. |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Common stock, par value (dollars per share) |  |  |  |  | $ 1.00 |  |
Business acquisition, share price (in dollars per share) |  |  |  |  | $ 38.85 |  |
Business acquisition, stock consideration |  |  |  |  | 0.45464 |  |

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