Income Taxes - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
Change in tax rate, deferred tax asset, income tax expense (benefit)			$ 54
Measurement period adjustment, income tax expense (benefit)		$ (4)
Deferred tax assets	$ 24
Decrease in deferred tax asset valuation allowance	4
Valuation allowance	24	28
Impact on effective tax rate if tax benefits are recognized	18	$ 18	$ 12
Liability for unrecognized tax benefits, potential decrease	5
State
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	310
Tax credit carryovers	8
Foreign
Operating Loss Carryforwards [Line Items]
Tax credit carryovers	$ 5