Employee Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Pension Plan
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plans	$ 1	$ 2	$ 2	$ 7