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Investments (Investments) (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Dec. 31, 2016
May 31, 2016
Investment in affiliated companies, at equity $ 275 $ 291    
Other investments 54 43    
Investment assets 329 334    
Investment liabilities 171 270    
Other Liabilities [Member]        
Investment liabilities $ 171 270    
Dow Corning Corporation [Member]        
Ownership interest     50.00% 50.00%
HSG [Member]        
Ownership interest 50.00%      
Investment liabilities $ 171 $ 270    
Hemlock Semiconductor LLC [Member]        
Ownership interest 49.90%   49.90%  
Hemlock Semiconductor Operations LLC [Member]        
Ownership interest 40.25%   40.25%  
Minimum [Member]        
Ownership interest 20.00%      
Maximum [Member]        
Ownership interest 50.00%