Income Taxes - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Operating Loss Carryforwards [Line Items]
Deferred tax assets	$ 17
Decrease in deferred tax asset valuation allowance	7
Valuation allowance	17	$ 24
Impact on effective tax rate if tax benefits are recognized	18
Liability for unrecognized tax benefits, potential decrease	10
State
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	189
Tax credit carryovers	3
Foreign
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	5
Tax credit carryovers	$ 5