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Note 9 - Investments (Details Textual) - USD ($) $ in Millions |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
May 31, 2016 | Jun. 30, 2016 | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Dow Corning Corporation [Member] |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  | 50.00% |  |  |  |  |  |
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions |  | 100.00% |  |  |  |  |  |
Equity Method Investments | [1] |  |  |  |  |  |  | $ 1,483
HSG [Member] |  |  |  |  |  |  |  |
Income (Loss) from Equity Method Investments |  |  | $ 22 |  |  |  |  |
HSC Operating Partnernship [Member] | HSG [Member] |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 80.50% | 80.50% |  | 80.50% |  |
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan, Actuarial Gain (Loss) |  |  |  |  |  | $ (260) |  |
Foreign Currency Transaction Gain, before Tax |  |  |  |  |  | 45 |  |
Dow Corning Corporation [Member] |  |  |  |  |  |  |  |
Income (Loss) from Equity Method Investments |  |  |  | $ 26 | $ 57 | 82 | $ 149 |
Gain (Loss) on Contract Termination |  |  |  |  |  |  | 178 |
Equity Method Investments |  | $ 4,800 | $ 279 | 279 |  | 279 |  | $ 1,905
Removal of Carrying Value of Equity Method Investment |  | $ 383 |  |  |  | 383 |  |
Release of Deferred Tax Liabilities |  |  |  |  |  | 105 |  |
Realignment of Equity Investment, Gain (Loss) |  |  |  | 2,676 |  | 2,676 |  |
Income (Loss) from Equity Method Investments |  |  |  | 41 | 62 | 100 | 156 |
Research and Development Expense |  |  |  | $ 43 | $ 63 | $ 100 | $ 125 |
[1] | Amounts reflect Corning’s direct ownership interests in the respective affiliated companies at June 30, 2016 and December 31, 2015. Corning does not control any of such entities.

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