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Note 4 - Significant Customers (Details)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2014
Dec. 31, 2013
Note 4 - Significant Customers (Details) [Line Items]      
Number of Significant Customers 0glw_NumberOfSignificantCustomers    
Samsung Display Co., Ltd. [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]      
Note 4 - Significant Customers (Details) [Line Items]      
Concentration Risk, Percentage   14.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= glw_SamsungDisplayCoLtdMember		  
AU Optronics Corporation [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]      
Note 4 - Significant Customers (Details) [Line Items]      
Concentration Risk, Percentage     10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= glw_AUOptronicsCorporationMember