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Restructuring Costs Business Optimization Initiative (Details) - Business Optimization Plan [Member] - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]    
Restructuring Reserve   $ 7
Costs paid or otherwise settled $ (3)  
Total amount remaining to be incurred 5  
Facility Related    
Restructuring Cost and Reserve [Line Items]    
Amount incurred to date $ 1