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Stock-Based Compensation - Stock Options (Details) - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Stock Options    
Grant date intrinsic value (in dollars per share) $ 36  
Shares    
Granted (in shares) 561,280  
Forfeited (in shares) 108,086  
Stock options    
Stock Options    
Vesting period 5 years  
Expiration period 10 years  
Shares    
Outstanding at the beginning of the period (in shares) 4,000,000 5,000,000
Granted (in shares) 1,000,000 0
Exercised (in shares) 2,000,000 1,000,000
Forfeited (in shares) 0 0
Outstanding at the end of the period (in shares) 3,000,000 4,000,000
Vested and expected to vest at the end of the period (in shares) 3,000,000 4,000,000
Exercisable at the end of the period (in shares) 2,000,000 3,000,000
Weighted average exercise price    
Outstanding at the beginning of the period (in dollars per share) $ 21 $ 16
Granted (in dollars per share) 36 42
Exercised (in dollars per share) 12 11
Forfeited (in dollars per share) 34 31
Outstanding at the end of the period (in dollars per share) 26 20
Vested and expected to vest at the end of the period (in dollars per share) 26 20
Exercisable at the end of the period (in dollars per share) $ 21 $ 15
Aggregate intrinsic value    
Exercised $ 29 $ 47
Vested and expected to vest at the end of the period 48 69
Exercisable at the end of the period $ 39 $ 62
Weighted average remaining option term    
Outstanding at the end of the period 6 years 5 years
Vested and expected to vest at the end of the period 6 years 5 years
Exercisable at the end of the period 4 years 3 years
Additional disclosures    
Total unrecognized compensation expense $ 9 $ 9
Weighted average remaining vesting period 3 years 3 years