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Stock-Based Compensation (Details 3) - Stock Options - USD ($)
$ / shares in Units, $ in Millions
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Stock Options    
Vesting period 5 years  
Expiration period 10 years  
Shares    
Outstanding at the beginning of the period (in shares) 18,000,000 24,000,000
Granted (in shares) 452,380  
Exercised (in shares) 2,000,000 2,000,000
Forfeited (in shares) 2,977,740  
Modification upon spin off 2,000,000  
Outstanding at the end of the period (in shares) 15,000,000 22,000,000
Option shares vested and expected to vest at the end of the period 15,000,000 22,000,000
Option shares exercisable at the end of the period 13,000,000 20,000,000
Weighted average exercise price    
Outstanding at the beginning of the period (in dollars per share) $ 21 $ 22
Granted (in dollars per share) 26 22
Exercised (in dollars per share) 16 16
Forfeited (in dollars per share) 29 22
Weighted average exercise price 19  
Outstanding at the end of the period (in dollars per share) 18 22
Option shares vested and expected to vest at the end of the period (in dollars per share) 18 22
Option shares exercisable at the end of the period (in dollars per share) $ 18 $ 23
Aggregate intrinsic value    
Exercised $ 24 $ 13
Option shares vested and expected to vest at the end of the period 101 88
Option shares exercisable at the end of the period $ 89 $ 69
Weighted average remaining option term    
Outstanding at the end of the period 4 years 4 years
Option shares vested and expected to vest at the end of the period 4 years 4 years
Option shares exercisable at the end of the period 3 years 3 years
Additional disclosures    
Total unrecognized compensation expense $ 7 $ 8
Weighted average remaining vesting period 3 years 2 years