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Stock Options and Other Stock Based Compensation - Options (Details) - Stock Options - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Number of Shares      
Options outstanding, Beginning balance (in shares) 2,621    
Granted (in shares) 1,098    
Exercised (in shares) (504)    
Forfeited or expired (in shares) (119)    
Options outstanding, ending balance (in shares) 3,096 2,621  
Options vested or expected to vest (in shares) 3,096    
Options exercisable (in shares) 1,342    
Weighted Average Exercise Price (per share)      
Options outstanding, Beginning balance (in dollars per share) $ 23.64    
Granted (in dollars per share) 15.10    
Exercised (in dollars per share) 10.13    
Forfeited or expired (in dollars per share) 21.24    
Options outstanding, Closing balance (in dollars per share) 22.91 $ 23.64  
Options vested or expected to vest (in dollars per share) 22.91    
Options exercisable (in dollars per share) $ 27.71    
Weighted Average Remaining Contractual Term (in years)      
Options outstanding, Closing balance 4 years 2 months 12 days    
Options vested or expected to vest 2 years 3 months 18 days    
Options exercisable 4 years 2 months 12 days    
Aggregate Intrinsic Value      
Options outstanding, Closing balance (in dollars) $ 3    
Options vested or expected to vest (in dollars) $ 3    
Weighted average grant-date fair value of options granted (in dollars per share) $ 4.98 $ 7.79 $ 13.17
Aggregate intrinsic value of options exercised (in dollars) $ 2   $ 3
Aggregate cash received from options exercised (in dollars) $ 5 $ 1 $ 5
Weighted average assumptions used to estimate the fair value of each option grant      
Expected life of options (years) 5 years 2 months 12 days 5 years 5 years
Expected stock price volatility (as a percent) 32.80% 34.50% 43.00%
Risk-free interest rate (as a percent) 1.50% 1.70% 1.60%
Expected dividend yield (as a percent) 0.00% 0.00% 0.00%