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Income Taxes - Tax credit carryforward valuation allowance (Details)
$ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
Tax credit carryforward valuation allowance  
Valuation allowance on foreign subsidiaries net deferred tax assets $ 9
Increase in foreign net operating loss carryforwards 11
Federal  
Tax credit carryforward valuation allowance  
Loss carryforwards, valuation allowance 5
State  
Tax credit carryforward valuation allowance  
Loss carryforwards, valuation allowance 14
Credit carryforwards, valuation allowance 6
Foreign  
Tax credit carryforward valuation allowance  
Loss carryforwards, valuation allowance 32
Credit carryforwards, valuation allowance $ 1