Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Details)

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Stock-Based Compensation (Details) - Jun. 30, 2015 - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
Total
Total
Options    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options $ 22 $ 22
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition   3 years 2 months 12 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) $ 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)   (57)
Forfeited/Cancelled (in shares)   (1)
Outstanding ending balance (in shares) 749 749
Number of awards exercisable (in shares) 634 634
WAEP Outstanding beginning balance (in dollars per share)   $ 32.21
WAEP options exercised (in dollars per share)   30.68
WAEP options forfeited/cancelled (in dollars per share)   37.17
WAEP Outstanding ending balance (in dollars per share) $ 32.33 32.33
WAEP options exercisable (in dollars per share) $ 32.06 $ 32.06
Weighted average remaining contractual life outstanding 3 years 8 months 12 days  
Weighted average remaining contractual life exercisable 3 years 7 months 6 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)   (150)
Forfeited/Cancelled (in shares)   (2)
Outstanding ending balance (in shares) 2,988 2,988
Number of awards exercisable (in shares) 1,245 1,245
WAEP Outstanding beginning balance (in dollars per share)   $ 39.85
WAEP Options granted (in dollars per share)   53.86
WAEP options exercised (in dollars per share)   31.30
WAEP options forfeited/cancelled (in dollars per share)   37.14
WAEP Outstanding ending balance (in dollars per share) $ 40.29 40.29
WAEP options exercisable (in dollars per share) $ 32.02 $ 32.02
Weighted average remaining contractual life outstanding 6 years 7 months 6 days  
Weighted average remaining contractual life exercisable 3 years 7 months 6 days  
Aggregate intrinsic value outstanding $ 32 $ 32
Aggregate intrinsic value exercisable $ 24 $ 24