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Acquisitions - (Details) - USD ($)
$ in Millions
6 Months Ended
Mar. 01, 2019
Jun. 30, 2019
Dec. 31, 2018
Acquisitions      
Payment for acquisition, net of cash acquired   $ 42  
Cash acquired from acquisition   4  
Goodwill   801 $ 791
Western Polymer      
Acquisitions      
Payment for acquisition, net of cash acquired   42  
Cash acquired from acquisition $ 4    
Goodwill   13  
Tangible assets, net   29  
Pre-tax acquisition costs   $ 2