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Acquisitions (Details) - USD ($)
$ in Millions
6 Months Ended
Mar. 01, 2019
Jun. 30, 2019
Jun. 30, 2020
Dec. 31, 2019
Acquisitions        
Payment for acquisition, net of cash acquired   $ 42    
Cash acquired from acquisition   $ 4    
Goodwill     $ 791 $ 801
Western Polymer        
Acquisitions        
Payment for acquisition, net of cash acquired $ 42      
Cash acquired from acquisition 4      
Goodwill 13      
Tangible assets, net $ 29