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Investments (Investments) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
May 31, 2016
Other investments $ 60 $ 67  
Investment assets 340 336  
Investment liabilities 105 241  
Dow Corning Corporation [Member]      
Ownership interest     50.00%
Investment in affiliated companies, at equity     $ 4,800
All Other [Member]      
Investment in affiliated companies, at equity [1] $ 280 269  
HSG [Member]      
Ownership interest [1],[2] 50.00%    
Investment liabilities [1],[2] $ 105 $ 241  
HSG [Member] | HSC Operating Partnership [Member]      
Ownership interest 80.50%    
Minimum [Member]      
Ownership interest 20.00%    
Maximum [Member]      
Ownership interest 50.00%    
[1] Amount reflects Corning's direct ownership interests in the affiliated companies at December 31, 2017 and December 31, 2016. Corning does not control any of such entities.
[2] HSG indirectly holds an 80.5% interest in a HSG operating partnership. The negative carrying value of the investment in HSG is recorded in Other Liabilities.