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Investments (Investments) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2016
Jun. 01, 2016
Other investments $ 43 $ 22    
Investment assets 334 376    
Investment liabilities 270      
Dow Corning Corporation [Member]        
Ownership interest     50.00% 50.00%
All Other [Member]        
Investment in affiliated companies, at equity [1],[2] $ 291 354    
HSG [Member]        
Ownership interest [1],[2] 50.00%      
Investment assets   $ 42    
Investment liabilities [1],[2] $ 270      
Hemlock Semiconductor LLC [Member]        
Ownership interest 49.90%      
Hemlock Semiconductor Operations LLC [Member]        
Ownership interest 40.25%      
Minimum [Member]        
Ownership interest [1],[2] 20.00%      
Maximum [Member]        
Ownership interest [1],[2] 50.00%      
[1] Amounts reflect Corning’s direct ownership interest in the affiliated companies at December 31, 2019 and 2018. Corning does not control these entities.
[2] Hemlock Semiconductor LLC and Hemlock Semiconductor Operations LLC, of which Corning has 49.9% and 40.25% ownership, respectively, are recorded as equity method investments and are affiliated companies of HSG. At December 31, 2019, the negative carrying value of Corning’s investment in HSG was $270 million and recorded in Other Liabilities. At December 31, 2018, the carrying value of the investment in HSG was $42 million and recorded in Investments.