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Stock-Based Compensation - Stock Options (Details) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Sep. 30, 2017
Stock Options      
Grant date intrinsic value (in dollars per share) $ 36    
Shares      
Granted (in shares) 561,280    
Forfeited (in shares) 42,570    
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) 1,000,000 1,000,000  
Forfeited (in shares) 0 0  
Outstanding at the end of the period (in shares) 4,000,000 4,000,000  
Vested and expected to vest at the end of the period (in shares) 4,000,000   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) 11 12  
Forfeited (in dollars per share) 36 31  
Outstanding at the end of the period (in dollars per share) 25 $ 19  
Vested and expected to vest at the end of the period (in dollars per share) 25   $ 19
Exercisable at the end of the period (in dollars per share) $ 20   $ 15
Aggregate intrinsic value      
Exercised $ 17 $ 36  
Vested and expected to vest at the end of the period 52   $ 82
Exercisable at the end of the period $ 45   74
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 4 years  
Additional disclosures      
Total unrecognized compensation expense $ 11   $ 10
Weighted average remaining vesting period 3 years 3 years