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Capital Structure (Details) - USD ($) |  |  |  | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 15, 2019 | Aug. 08, 2019 | May 16, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Oct. 15, 2024 | Jun. 10, 2019 | Dec. 31, 2018
Debt outstanding: |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) |  |  |  | $ 1 |  |  |  | $ 1
Redemption and repayment of long-term debt |  |  |  | $ 317,000,000 | $ 401,000,000 |  |  |
Senior Notes, Due 2049 |  |  |  |  |  |  |  |
Debt outstanding: |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 500,000,000 |
Note stated interest rate (as a percent) |  |  |  |  |  |  | 3.85% |
Senior Notes Due 2019 at 7.45 Percent |  |  |  |  |  |  |  |
Debt outstanding: |  |  |  |  |  |  |  |
Note stated interest rate (as a percent) |  |  | 7.45% |  |  |  |  |
Redemption and repayment of long-term debt |  |  | $ 317,000,000 |  |  |  |  |
Series H Preferred Stock |  |  |  |  |  |  |  |
Debt outstanding: |  |  |  |  |  |  |  |
Shares Issued (in shares) |  | 46,000 |  |  |  |  |  |
Dividend Rate (in dollars per share) |  | 5.10% |  |  |  |  |  |
Preferred stock, par value (in dollars per share) |  | $ 1.00 |  |  |  |  |  |
Liquidation preference per share (in dollars per shares) |  | $ 25,000 |  |  |  |  |  |
Proceeds from issuance of preferred stock Gross |  | $ 1,150,000,000 |  |  |  |  |  |
Redemption price (in dollars per share) |  | $ 25,000 |  |  |  |  |  |
Period after occurrence in which redemption of debt in whole permissible |  | 90 days |  |  |  |  |  |
Redemption price, rating agency event (in dollars per share) |  | $ 25,500 |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |
Debt outstanding: |  |  |  |  |  |  |  |
Payments for repurchase of preferred stock | $ 1,130,000,000 |  |  |  |  |  |  |
Redemption price in excess of carrying value | $ 37,000,000 |  |  |  |  |  |  |
Subsequent Event | Series D Preferred Stock |  |  |  |  |  |  |  |
Debt outstanding: |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ 1.00 |  |  |  |  |  |  |
Liquidation preference per share (in dollars per shares) | $ 25,000 |  |  |  |  |  |  |
Stock redeemed (in shares) | 5,400 |  |  |  |  |  |  |
Subsequent Event | Series E Preferred Stock |  |  |  |  |  |  |  |
Debt outstanding: |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ 1.00 |  |  |  |  |  |  |
Liquidation preference per share (in dollars per shares) | $ 25,000 |  |  |  |  |  |  |
Stock redeemed (in shares) | 29,900 |  |  |  |  |  |  |
Subsequent Event | Series F Preferred Stock |  |  |  |  |  |  |  |
Debt outstanding: |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ 1.00 |  |  |  |  |  |  |
Liquidation preference per share (in dollars per shares) | $ 25,000 |  |  |  |  |  |  |
Stock redeemed (in shares) | 10,000 |  |  |  |  |  |  |
Forecast | Series H Preferred Stock |  |  |  |  |  |  |  |
Debt outstanding: |  |  |  |  |  |  |  |
Redemption price (in dollars per share) |  |  |  |  |  | $ 25,000 |  |

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