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Capital Structure (Details) - USD ($)
$ / shares in Units, $ in Millions
Jan. 15, 2020
Sep. 30, 2020
Dec. 31, 2019
Debt outstanding:      
Preferred stock, par value (in dollars per share)   $ 1 $ 1
Redemption of preferred stock $ 288    
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