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Consolidated Balance Sheets (Parenthetical) - $ / shares
Jun. 30, 2017
Dec. 31, 2016
Series A Convertible Preferred Stock [Member]    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock authorized (in shares) 75,000,000 75,000,000
Preferred stock issued (in shares) 71,000,000 71,000,000
Series C Convertible Preferred Stock [Member]    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock authorized (in shares) 75,000,000 75,000,000
Preferred stock issued (in shares) 25,000,000 28,000,000
Series A Common Stock [Member]    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock authorized (in shares) 1,700,000,000 1,700,000,000
Common stock issued (in shares) 157,000,000 155,000,000
Series B Common Stock [Member]    
Stock, par value (in dollars per share) $ 0.01 $ 0.01
Stock, authorized (in shares) 100,000,000 100,000,000
Stock issued (in shares) 7,000,000 7,000,000
Series C Common Stock [Member]    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock authorized (in shares) 2,000,000,000 2,000,000,000
Common stock issued (in shares) 383,000,000 381,000,000