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Acquisitions - (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Mar. 01, 2019
Mar. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Acquisitions        
Payment for acquisition, net of cash acquired     $ 41  
Cash acquired from acquisition     4  
Goodwill   $ 815 815 $ 791
Western Polymer        
Acquisitions        
Payment for acquisition, net of cash acquired $ 41      
Cash acquired from acquisition $ 4      
Reporting lag   1 month    
Goodwill   $ 22 22  
Tangible assets, net   19 19  
Pre-tax acquisition costs   $ 1 $ 1