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Share-Based Compensation - Summary of Stock Option Awards Outstanding (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Outstanding at beginning of period 635  
Granted 196  
Outstanding at end of period 831 635
Vested and expected to vest at end of period 790  
Exercisable at end of period 0  
Outstanding at beginning of period $ 21.44  
Granted 14.15  
Outstanding at end of period 19.85 $ 21.44
Vested and expected to vest at end of period 19.94  
Exercisable at end of period $ 0  
Outstanding at beginning of period 7 years 8 months 12 days 7 years 2 months 12 days
Granted 9 years 10 months 24 days  
Vested and expected to vest at end of period 7 years 7 months 6 days  
Exercisable at end of period 0 years  
Outstanding at beginning of period $ 0  
Outstanding at end of period 0 $ 0
Vested and expected to vest at end of period 0  
Exercisable at end of period $ 0