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Series A Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 04, 2015
Dec. 31, 2014
Series A Preferred Stock [Abstract]      
Series A preferred shares, shares issued 820,000.00 820,000 0
Aggregate purchase price   $ 820  
Stated Value Of Preferred Shares Per Share   $ 1,000  
Direct Issuance Expenses $ 26    
Accrued Dividends $ 4    
Liquidation preference per share $ 1,000    
Dividend rate 5.50%    
Penalty dividend rate 8.00%    
Conversion price per preferred share $ 30.00    
Conversion rate per preferred share 33.33    
Financial instruments subject to redemption, settlement terms, maximum number of shares 27,400,000    
Minimum volume weighted average price of common stock for conversion at the option of the Company $ 54.00