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Capital Structure (Details) - USD ($) |  |  |  | 6 Months Ended |
--- | --- | --- | --- | --- | ---
May 15, 2018 | May 13, 2018 | Mar. 29, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Debt outstanding: |  |  |  |  |  |
Preferred stock, par value (in dollars per share) |  |  |  | $ 1 |  | $ 1
Repayments of long-term debt |  |  |  | $ 401,000,000 | $ 0 |
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% |  |  |  |  |  |
Debt outstanding: |  |  |  |  |  |
Debt instrument, face amount |  | $ 224,000,000 |  |  |  |
Note stated interest rate (as a percent) |  | 6.125% |  |  |  |
Redemption price, percentage of principal amount redeemed |  | 100.00% |  |  |  |
Senior Debentures Due 2018 at 6.75% |  |  |  |  |  |
Debt outstanding: |  |  |  |  |  |
Note stated interest rate (as a percent) | 6.75% |  |  |  |  |
Redemption price, percentage of principal amount redeemed | 100.00% |  |  |  |  |
Repayments of long-term debt | $ 176,000,000 |  |  |  |  |
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% |  |  |

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