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Note 11 - Goodwill and Other Intangible Assets (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Note 11 - Goodwill and Other Intangible Assets (Details) [Line Items]      
Goodwill, Gross $ 7,800,000,000us-gaap_GoodwillGross   $ 7,600,000,000us-gaap_GoodwillGross
Finite-lived Intangible Assets Acquired 233,000,000us-gaap_FinitelivedIntangibleAssetsAcquired1    
Amortization of Intangible Assets 12,000,000us-gaap_AmortizationOfIntangibleAssets 8,000,000us-gaap_AmortizationOfIntangibleAssets  
Finite-Lived Intangible Assets, Translation Adjustments 16,000,000us-gaap_FiniteLivedIntangibleAssetsTranslationAdjustments    
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year 57,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 55,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 55,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 55,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour    
Finite-Lived Intangible Assets, Amortization Expense, Year Five 55,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive    
Finite-Lived Intangible Assets, Amortization Expense, after Year Five 50,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive    
Optical Communications [Member]      
Note 11 - Goodwill and Other Intangible Assets (Details) [Line Items]      
Goodwill, Impaired, Accumulated Impairment Loss $ 6,500,000,000us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= glw_OpticalCommunicationsMember
  $ 6,500,000,000us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= glw_OpticalCommunicationsMember