Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Details)

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Stock-Based Compensation (Details)
$ / shares in Units, shares in Thousands, $ in Millions
 9 Months Ended
Sep. 30, 2015
USD ($)
$ / shares
shares
Sep. 30, 2015
USD ($)
$ / shares
shares
Options    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options | $ $ 21 $ 21
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition   3 years 3 months 18 days
Common Stock, Capital Shares Reserved for Future Issuance 3,700 3,700
Class C common stock    
Stock Based Compensation    
Vesting period   2 years
Weighted average grant date fair value (in dollars per share) | $ / shares $ 15.03 $ 15.03
Options    
Options granted (in shares)   3
2014 Plan | Awards | Class A common stock    
Options    
Outstanding beginning balance (in shares)   807
Exercised (in shares)   (61)
Forfeited/Cancelled (in shares)   (1)
Outstanding ending balance (in shares) 745 745
Number of awards exercisable (in shares) 631 631
WAEP Outstanding beginning balance (in dollars per share) | $ / shares   $ 32.21
WAEP options exercised (in dollars per share) | $ / shares   30.40
WAEP options forfeited/cancelled (in dollars per share) | $ / shares   37.19
WAEP Outstanding ending balance (in dollars per share) | $ / shares $ 32.36 32.36
WAEP options exercisable (in dollars per share) | $ / shares $ 32.10 $ 32.10
Weighted average remaining contractual life outstanding 3 years 6 months  
Weighted average remaining contractual life exercisable 3 years 3 months 18 days  
Aggregate intrinsic value outstanding | $ $ 14 $ 14
Aggregate intrinsic value exercisable | $ $ 12 $ 12
2014 Plan | Awards | Class C common stock    
Options    
Outstanding beginning balance (in shares)   3,137
Options granted (in shares)   3
Exercised (in shares)   (161)
Forfeited/Cancelled (in shares)   (2)
Outstanding ending balance (in shares) 2,977 2,977
Number of awards exercisable (in shares) 1,236 1,236
WAEP Outstanding beginning balance (in dollars per share) | $ / shares   $ 39.85
WAEP Options granted (in dollars per share) | $ / shares   53.86
WAEP options exercised (in dollars per share) | $ / shares   31.10
WAEP options forfeited/cancelled (in dollars per share) | $ / shares   37.19
WAEP Outstanding ending balance (in dollars per share) | $ / shares $ 40.34 40.34
WAEP options exercisable (in dollars per share) | $ / shares $ 32.06 $ 32.06
Weighted average remaining contractual life outstanding 6 years 4 months 24 days  
Weighted average remaining contractual life exercisable 3 years 3 months 18 days  
Aggregate intrinsic value outstanding | $ $ 32 $ 32
Aggregate intrinsic value exercisable | $ $ 24 $ 24