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Investments (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 09, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2016
May 31, 2016
Loss from settlement   $ (83) $ 24 $ (108) $ 24    
TCS Settlement [Member]              
Loss from settlement   (81)   (81)      
Equity loss from settlement   $ 19   $ 19      
Dow Corning Corporation [Member]              
Equity Method Investment, Ownership Percentage           50.00% 50.00%
Pittsburgh Corning Corporation PCC [Member] | Asbestos Litigation [Member]              
Equity Method Investment, Ownership Percentage           50.00%  
HSG [Member]              
Equity Method Investment, Ownership Percentage   50.00%   50.00%      
Hemlock Semiconductor LLC [Member]              
Equity Method Investment, Ownership Percentage           49.90%  
HSG [Member]              
Loss from settlement       $ 165      
Inventory Write-down       $ 44      
HSG [Member] | TCS Settlement [Member]              
Loss from settlement   $ (200)          
Hemlock Semiconductor LLC [Member]              
Business combination ownership interest acquired 100.00%            
HSG [Member]              
Purchase price $ 250            
HSG [Member] | HSG [Member]              
Purchase price 250            
Dupont’s Trichlorosilane [Member] | HSG [Member]              
Purchase price 255            
Pre-existing contract disputes 175            
Pre-existing contract disputes, fair value $ 200