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Note 6 - Available-for-Sale Investments (Details) - Summary of Fair Value of Available-for-Sale Investments (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
US Government Agencies Debt Securities [Member]    
Note 6 - Available-for-Sale Investments (Details) - Summary of Fair Value of Available-for-Sale Investments [Line Items]    
Amortized cost $ 761us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		 $ 759us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Fair value 763us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		 759us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Total Short-Term Investments [Member]    
Note 6 - Available-for-Sale Investments (Details) - Summary of Fair Value of Available-for-Sale Investments [Line Items]    
Amortized cost 761us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= glw_TotalShortTermInvestmentsMember		 759us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= glw_TotalShortTermInvestmentsMember
Fair value 763us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= glw_TotalShortTermInvestmentsMember		 759us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= glw_TotalShortTermInvestmentsMember
Asset-backed Securities [Member]    
Note 6 - Available-for-Sale Investments (Details) - Summary of Fair Value of Available-for-Sale Investments [Line Items]    
Amortized cost 41us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember		 42us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
Fair value 37us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember		 38us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
Total Long-Term Investments [Member]    
Note 6 - Available-for-Sale Investments (Details) - Summary of Fair Value of Available-for-Sale Investments [Line Items]    
Amortized cost 41us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= glw_TotalLongTermInvestmentsMember		 42us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= glw_TotalLongTermInvestmentsMember
Fair value $ 37us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= glw_TotalLongTermInvestmentsMember		 $ 38us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= glw_TotalLongTermInvestmentsMember