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Acquisitions and Divestitures (Textuals) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jan. 31, 2018
Feb. 17, 2017
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]          
Acquisition of business, net of cash acquired     $ 430 $ 6  
Pure Technologies Ltd          
Business Acquisition [Line Items]          
Acquisition of business, net of cash acquired $ 420        
Acquisition costs $ 4        
Revenues     16    
Operating loss     3    
Other acquisitions          
Business Acquisition [Line Items]          
Acquisition of business, net of cash acquired     $ 10    
UK and Poland Based Membranes Business | Divested Businesses          
Business Acquisition [Line Items]          
Consideration for divestiture   $ 11      
Gain on sale of business   $ 5      
Revenue from divested business         $ 8