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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).

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