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Income Taxes (Net Operating Losses and Credits) (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Foreign Tax Authority  
Operating Loss Carryforwards [Line Items]  
Net operating loss carryforwards, subject to expiration $ 3
Net operating loss carryforwards, not subject to expiration 20
State and local jurisdiction  
Operating Loss Carryforwards [Line Items]  
Net operating loss carryforwards, subject to expiration $ 4