Employee Benefit Plans - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Contribution Plan [Abstract]
Percentage of employees contributions maximum	50.00%
Percentage of company matches of employees contributions maximum	3.00%
Employee vesting period	2 years
Employer contributions for benefit plans	$ 81	$ 70	$ 60