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Stockholders' Equity Mandatory Convertible Preferred Stock (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Oct. 18, 2017
$ / shares
Jul. 19, 2017
$ / shares
Apr. 19, 2017
$ / shares
Jan. 18, 2017
$ / shares
Oct. 30, 2015
USD ($)
$ / shares
shares
Dec. 31, 2017
$ / shares
shares
Dec. 31, 2016
$ / shares
Class of Stock [Line Items]              
Depositary Share Offering | shares         32,000,000    
Amount of Interest Each Depositary Share has in a 9.75% Series A Mandatory Convertible Preferred Share         0.0005    
Preferred Stock, Dividend Rate, Percentage           9.75% 9.75%
Preferred Stock, Liquidation Preference Per Share           $ 1,000 $ 1,000
Depositary Shares, Liquidation Preference Per Share         $ 50    
Proceeds from Depositary Share Offering | $         $ 1,541    
Number of days in Average Trading Period           20  
Greater Than Applicable Market Value of Common Stock           $ 32.38  
Less Than Applicable Market Value of Common Stock           $ 27.56  
9.75% Series A Mandatory Convertible, $1,000 per share liquidation preference              
Class of Stock [Line Items]              
Issuances of common shares | shares         1,600,000    
Preferred Stock, Dividend Rate, Percentage         9.75% 9.75%  
Preferred Stock, Liquidation Preference Per Share         $ 1,000    
Dividends, Preferred Stock $ 24.375 $ 24.375 $ 24.375 $ 24.375   $ 24.375  
Depositary Stock, Dividends Per Share, Declared           $ 1.21875  
Minimum [Member]              
Class of Stock [Line Items]              
Depositary Shares, Shares Issued Upon Conversion | shares           1.5440  
Applicable Market Value of Common Stock           $ 27.56  
Minimum [Member] | 9.75% Series A Mandatory Convertible, $1,000 per share liquidation preference              
Class of Stock [Line Items]              
Convertible Preferred Stock, Shares Issued upon Conversion | shares           30.8800  
Maximum [Member]              
Class of Stock [Line Items]              
Depositary Shares, Shares Issued Upon Conversion | shares           1.8142  
Applicable Market Value of Common Stock           $ 32.38  
Maximum [Member] | 9.75% Series A Mandatory Convertible, $1,000 per share liquidation preference              
Class of Stock [Line Items]              
Convertible Preferred Stock, Shares Issued upon Conversion | shares           36.2840