Income Taxes - Schedule of Operating Loss and Tax Credit Carryforwards (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Federal Net Operating Losses
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 72	$ 82
State
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	26	26
Tax credit carryforwards	10	8
Federal
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	4	16
Foreign
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 379	$ 382