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Capital Structure (Details) - USD ($) |  | 1 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 29, 2018 | May 13, 2018 | Apr. 13, 2018 | Mar. 31, 2018 | Dec. 31, 2017
Debt outstanding: |  |  |  |  |
Preferred stock, par value (in dollars per share) |  |  |  | $ 1 | $ 1
Noncumulative Preferred Stock |  |  |  |  |
Debt outstanding: |  |  |  |  |
Preferred stock, issued shares (in shares) | 23,000 |  |  |  |
Preferred stock, dividend rate | 5.625% |  |  |  |
Preferred stock, par value (in dollars per share) | $ 1.00 |  |  |  |
Preferred stock, shares liquidation preference (in dollars per share) | $ 25,000 |  |  |  |
Proceeds from issuance of redeemable preferred stock | $ 575,000,000 |  |  |  |
Preferred stock, redemption price per share (in dollars per share) | $ 25,000 |  |  |  |
Period after occurrence of certain rating agency events in which redemption of debt in whole permissible | 90 days |  |  |  |
Senior Notes, Due 2021 |  |  |  |  |
Debt outstanding: |  |  |  |  |
Debt instrument, face amount | $ 250,000,000 |  |  |  |
Senior Notes, Due 2023 |  |  |  |  |
Debt outstanding: |  |  |  |  |
Debt instrument, face amount | $ 250,000,000 |  |  |  |
Junior Subordinated Debentures Due 2067 at 6.125% | Subsequent Event |  |  |  |  |
Debt outstanding: |  |  |  |  |
Debt instrument, face amount |  |  | $ 224,000,000 |  |
Note stated interest rate (as a percent) |  |  | 6.125% |  |
London Interbank Offered Rate (LIBOR) | Senior Notes, Due 2021 |  |  |  |  |
Debt outstanding: |  |  |  |  |
Basis spread on variable rate | 0.43% |  |  |  |
London Interbank Offered Rate (LIBOR) | Senior Notes, Due 2023 |  |  |  |  |
Debt outstanding: |  |  |  |  |
Basis spread on variable rate | 0.63% |  |  |  |
Scenario, Forecast | Junior Subordinated Debentures Due 2067 at 6.125% |  |  |  |  |
Debt outstanding: |  |  |  |  |
Redemption price, percentage of principal amount redeemed |  | 100.00% |  |  |
Debt instrument, repurchased face amount |  |  | $ 224,000,000 |  |
Debt instrument, accrued interest |  |  | $ 2,000,000 |  |

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