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Investments (Equity Method Investments) (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Schedule of Investments [Line Items]    
Equity method investments $ 5,169 $ 4,723
Other investments 3 3
Total 5,172 4,726
Samsung Corning Precision Materials Co., Ltd. [Member]
   
Schedule of Investments [Line Items]    
Equity method investments 3,536 3,315
Ownership interest percentage 50.00% [1]  
Dow Corning Corporation [Member]
   
Schedule of Investments [Line Items]    
Equity method investments 1,275 1,160
Ownership interest percentage 50.00% [1]  
All Other [Member]
   
Schedule of Investments [Line Items]    
Equity method investments $ 358 $ 248
Ownership interest percentage, minimum 20.00% [1]  
Ownership interest percentage, maximum 50.00% [1]  
[1] Amounts reflect Corning's direct ownership interests in the respective affiliated companies.