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Investments (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2016
Jun. 01, 2016
Asset Impairment Charges   $ 369    
Inventory write-down   105    
Performance obligations satisfied   $ 37    
Settlement gains $ 185      
Dow Corning Corporation [Member]        
Equity Method Investment, Ownership Percentage     50.00% 50.00%
Pittsburgh Corning Corporation PCC [Member]        
Equity Method Investment, Ownership Percentage 50.00% 50.00%    
HSG [Member]        
Equity Method Investment, Ownership Percentage [1],[2] 50.00% 50.00%    
Inventory write-down   $ 257    
Decrease in carrying value $ 239      
Performance obligations satisfied 434      
Settlement gains 383      
Investments in and Advances to Affiliates, Amount of Equity $ 208 $ 208    
Hemlock Semiconductor LLC [Member]        
Equity Method Investment, Ownership Percentage 49.90% 49.90%    
Hemlock Semiconductor Operations LLC [Member]        
Equity Method Investment, Ownership Percentage 40.25% 40.25%    
HSG [Member]        
Asset Impairment Charges   $ 916    
[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.