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Stock-Based Compensation - Stock Options (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Stock Options    
Grant date intrinsic value (in dollars per share) $ 48  
Shares    
Granted (in shares) 420,840  
Forfeited (in shares) 16,240  
Stock options    
Shares    
Outstanding at the beginning of the period (in shares) 3,000,000 4,000,000
Granted (in shares) 1,000,000 1,000,000
Exercised (in shares) 1,000,000 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) 1,000,000 2,000,000
Weighted average exercise price    
Outstanding at the beginning of the period (in dollars per share) $ 27 $ 21
Granted (in dollars per share) 48 36
Exercised (in dollars per share) 17 11
Forfeited (in dollars per share) 42 0
Outstanding at the end of the period (in dollars per share) 32 25
Vested and expected to vest at the end of the period (in dollars per share) 32 25
Exercisable at the end of the period (in dollars per share) $ 26 $ 19
Aggregate intrinsic value    
Exercised $ 22 $ 13
Vested and expected to vest at the end of the period 14 57
Exercisable at the end of the period $ 13 $ 50
Weighted average remaining option term    
Outstanding at the end of the period 7 years 6 years
Vested and expected to vest at the end of the period 7 years 6 years
Exercisable at the end of the period 6 years 4 years
Additional disclosures    
Total unrecognized compensation expense $ 9 $ 12
Weighted average remaining vesting period 3 years  
Five Year Vesting | Stock options    
Stock Options    
Vesting period 5 years  
Three Year Vesting | Stock options    
Stock Options    
Vesting period 3 years