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Description of Business (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Entity Number of Employees 10,000   10,000  
HVCC [Member]        
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax $ 0 $ 0 $ (3) $ (7)