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Income Taxes - Operating Loss Carryforwards (Details) - State [Member]
$ in Millions
Dec. 31, 2017
USD ($)
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards $ 21
Tax Years 2023 - 2027 [Member]  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 1
Tax Years 2028 - 2032 [Member]  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards $ 20