Leases - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Range [Axis] [Line Items]
Operating Lease, Weighted Average Remaining Lease Term	5 years		5 years		5 years
Document Period End Date			Jun. 30, 2020
Operating lease expenses	$ 8	$ 10	$ 16	$ 19