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Income Taxes - Tax credit carryforward valuation allowance (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Tax credit carryforward valuation allowance    
Valuation allowance on foreign subsidiaries net deferred tax assets $ 1 $ 3
State    
Tax credit carryforward valuation allowance    
Loss carryforwards, valuation allowance 9 11
Credit carryforwards, valuation allowance 4 3
Tax carryforwards, subject to limitations 1  
Foreign    
Tax credit carryforward valuation allowance    
Loss carryforwards, valuation allowance 13 $ 14
Credit carryforwards, valuation allowance $ 1