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Note 7 - Investments (Details) - Results of Operations - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Note 7 - Investments (Details) - Results of Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of affiliated companies |  | $ 104 | $ 39 | $ 62 | $ 94 | $ 23 | $ 95 | $ 62 | $ 86 | $ 299 | $ 266 | $ 547
Dividends received |  |  |  |  |  |  |  |  |  | 143 | 1,704 | 630
Affiliated Companies [Member] |  |  |  |  |  |  |  |  |  |  |  |
Note 7 - Investments (Details) - Results of Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales | [1],[2] |  |  |  |  |  |  |  |  | 6,461 | 7,124 | 8,526
Gross profit | [1],[2] |  |  |  |  |  |  |  |  | 1,606 | 1,701 | 2,655
Net income | [1],[2] |  |  |  |  |  |  |  |  | 586 | 647 | 1,135
Equity in earnings of affiliated companies | [1],[2] |  |  |  |  |  |  |  |  | 299 | 266 | 547
Corning sales to affiliated companies |  |  |  |  |  |  |  |  |  | 30 | 13 | 13
Corning purchases |  |  |  |  |  |  |  |  |  | 19 | 25 | 189
Corning transfers of assets, at cost, to affiliated companies (3) | [3] |  |  |  |  |  |  |  |  |  |  | 37
Dividends received |  |  |  |  |  |  |  |  |  | 143 | 130 | 629
Royalty income from affiliated companies |  |  |  |  |  |  |  |  |  |  | 2 | 57
Corning services to affiliates |  |  |  |  |  |  |  |  |  |  |  | 2
Dow Corning Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |
Note 7 - Investments (Details) - Results of Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 5,649 | 6,221 | 5,711
Gross profit | [1] |  |  |  |  |  |  |  |  | 1,472 | 1,543 | 1,280
Net income |  |  |  |  |  |  |  |  |  | 563 | 513 | 376
Equity in earnings of affiliated companies |  |  |  |  |  |  |  |  |  | 281 | 252 | 196
Corning purchases |  |  |  |  |  |  |  |  |  | 15 | 15 | 22
Dividends received |  |  |  |  |  |  |  |  |  | $ 143 | $ 125 | $ 100
[1] | 2013 amounts include Samsung Corning Precision Materials.
[2] | As a result of the series of strategic and financial agreements with Samsung Display entered into on October 22, 2013, certain non-operating assets of Samsung Corning Precision Materials were held for sale as of December 31, 2013 and are reported as discontinued operations in Samsung Corning Precision Materials financial statements, which are attached in Item 15, Exhibits and Financial Schedules. Previous period amounts have been conformed for comparative purposes.
[3] | In 2013, Corning purchased machinery and equipment on behalf of Samsung Corning Precision Materials to support its capital expansion initiative.

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