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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Stockholders’ Equity    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 10,000,000 10,000,000
Preferred stock, shares issued (in shares) 0 1,600,000
Preferred stock, shares outstanding (in shares) 0 1,600,000
9.75% Series A Mandatory Convertible, $1,000 per share liquidation preference $ 1,000 $ 1,000
9.75% Series A Mandatory Convertible, $1,000 per share liquidation preference 9.75% 9.75%
Class P    
Stockholders’ Equity    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 4,000,000,000 4,000,000,000
Common stock, shares issued (in shares) 2,262,165,783 2,217,110,072
Common stock, shares outstanding (in shares) 2,262,165,783 2,217,110,072