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Note 4 - Income Taxes (Tables) | 9 Months Ended
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Sep. 30, 2015
Income Tax Disclosure [Abstract] |
Schedule of Income Tax Provisions and Rates [Table Text Block] |
| Three months ended September 30, |  | Nine months ended September 30,
| 2015 |  | 2014 |  | 2015 |  | 2014
Provision for income taxes | $ | (6) |  | $ | (395) |  | $ | (202) |  | $ | (747)
Effective tax rate |  | 2.8% |  |  | 28.0% |  |  | 15.3% |  |  | 33.5%

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- Definition Tabular disclosure of the provision for income taxes and the related effective income tax rates. + References No definition available. + Details
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Namespace Prefix: | glw_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration