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Stockholders' Equity - Restricted and Performance Awards (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2015
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Restricted shares vested (in shares)           $ 39   $ 22
Restricted shares outstanding (in shares) 377,000         377,000    
Stock based compensation expense (reversal)   $ 9 $ 3 $ 16 $ 9 $ 23 $ 22 29
Restricted and Performance Stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Fair value of restricted and performance stock awards granted       32 27 $ 28 25 33
Restricted shares vested (in shares)       $ 21 $ 24   24  
Performance Restricted Stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Weighted-average grant date fair value per share of the performance awards with vesting conditions based on TSR (in dollars per share) $ 49.43         $ 49.43    
Risk-free interest rate           0.80%    
Dividend yield (in percent)           0.00%    
Weighted-average expected life           2 years 10 months    
Restricted shares vested (in shares) 229,000              
Restricted shares                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Restricted shares granted (in shares)           273,710    
Restricted shares outstanding (in shares)   603,000   603,000        
Restricted shares expected to vest (in shares)   425,000   425,000        
Stock based compensation expense (reversal)           $ 19 $ 19 $ 26
Restricted shares vested (in shares)           371,489    
Executive Officer | Restricted shares                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Restricted shares granted (in shares)           163,000    
Executive Officer | 2011 Plan | Restricted shares                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Restricted shares expected to vest (in shares) 199,000         199,000    
Stock based compensation expense (reversal)           $ (3)    
Restricted shares forfeited (in shares)           178,000