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Capital Structure (Details) - USD ($) $ / shares in Units, $ in Millions |  | 6 Months Ended |
--- | --- | --- | ---
Jan. 15, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Debt outstanding: |  |  |  |
Preferred stock, par value (in dollars per share) |  | $ 1 |  | $ 1
Redemption of preferred stock | $ 288 | $ 288 | $ 0 |
Redemption price in excess of carrying value | $ 10 |  |  |
Series A Preferred Stock |  |  |  |
Debt outstanding: |  |  |  |
Stock redeemed (in shares) | 11,500 |  |  |
Preferred stock, par value (in dollars per share) | $ 1.00 |  |  |
Liquidation preference per share (in dollars per shares) | $ 25,000 |  |  |

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