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Note 8 - Investments (Details) - Results of Operations - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Statement of Operations:        
Corning’s equity in earnings of Dow Corning $ 39 $ 95 $ 195 $ 243
Dow Corning Corporation [Member]        
Statement of Operations:        
Net sales 1,389 1,520 4,177 4,545
Gross profit (1) [1] 336 351 1,058 1,071
Net income attributable to Dow Corning 72 176 370 476
Corning’s equity in earnings of Dow Corning $ 36 $ 88 $ 185 $ 234
[1] Gross profit for the three and nine months ended September 30, 2015 includes research and development costs of $54 million and $179 million (2014: $70 million and $207 million).