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Income Taxes - Tax credit carryforward valuation allowance (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Tax credit carryforward valuation allowance    
Valuation allowance on foreign subsidiaries net deferred tax assets $ 3 $ 2
State    
Tax credit carryforward valuation allowance    
Loss carryforwards, valuation allowance 11 9
Credit carryforwards, valuation allowance 3 2
Foreign    
Tax credit carryforward valuation allowance    
Loss carryforwards, valuation allowance $ 14 $ 21