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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
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) 1,600,000 1,600,000
Preferred stock, shares outstanding (in shares) 1,600,000 1,600,000
Preferred Stock, Liquidation Preference Per Share $ 1,000 $ 1,000
Preferred Stock, Dividend Rate, Percentage 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) 2,217,110,072 2,230,102,384
Common stock, shares outstanding (in shares) 2,217,110,072 2,230,102,384