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Stock-Based Compensation (Details 2) - Long-term stock awards - USD ($)
$ / shares in Units, $ in Millions
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Unvested stock award shares    
Balance at the beginning of the period (in shares) 6,000,000 8,000,000
Granted (in shares) 719,546 1,000,000
Vested (in shares) 2,000,000 2,000,000
Forfeitures upon spin off 1,000,000  
Modification upon spin off 1,000,000  
Balance at the end of the period (in shares) 5,000,000 7,000,000
Weighted average grant date fair value    
Balance at the beginning of the period (in dollars per share) $ 18 $ 17
Granted (in dollars per share) 26 22
Vested (in dollars per share) 17 17
Forfeited (in dollars per share) 19 16
Weighted average grant date fair value 20  
Balance at the end of the period (in dollars per share) $ 17 $ 18
Additional disclosures    
Total unrecognized compensation expense $ 52 $ 81
Remaining weighted average vesting period 3 years 4 years
Total market value (at the vesting date) of stock award shares $ 49 $ 45