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Note 4 - Income Taxes (Tables) | 6 Months Ended
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Jun. 30, 2015
Income Tax Disclosure [Abstract] |
Schedule of Income Tax Provisions and Rates [Table Text Block] |
| Three months ended June 30, |  | Six months ended June 30,
| 2015 |  | 2014 |  | 2015 |  | 2014
Provision for income taxes | $ | (110) |  | $ | (172) |  | $ | (196) |  | $ | (352)
Effective tax rate |  | 18.2% |  |  | 50.4% |  |  | 17.8% |  |  | 42.8%

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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
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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