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Income Taxes (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Income Tax Disclosure [Abstract]          
Adjustments recognized for uncertain tax positions $ 0 $ 0 $ 0 $ 0  
Operating loss carryforwards         $ 1,600,000,000