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Note 8 - Investments (Details) - Results of Operations - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Statement of Operations: |  |  |  |  |  |
Corning’s equity in earnings of Dow Corning | $ 62 |  | $ 62 |  | $ 156 | $ 148
Dow Corning Corporation [Member] |  |  |  |  |  |
Statement of Operations: |  |  |  |  |  |
Net sales | 1,424 |  | 1,501 |  | 2,788 | 3,025
Gross profit (1) | 364 | [1] | 349 | [1] | 722 | 720
Net income attributable to Dow Corning | 113 |  | 109 |  | 298 | 300
Corning’s equity in earnings of Dow Corning | $ 57 |  | $ 54 |  | $ 149 | $ 146
[1] | Gross profit for the three and six months ended June 30, 2015 includes research and development costs of $63 million and $125 million (2014: $70 million and $137 million).

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