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Note 6 - Income Taxes (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Note 6 - Income Taxes (Details) [Line Items]      
Income Tax Holiday, Income Tax Benefits Per Share (in Dollars per share) $ 0.01us-gaap_IncomeTaxHolidayIncomeTaxBenefitsPerShare $ 0.02us-gaap_IncomeTaxHolidayIncomeTaxBenefitsPerShare $ 0.02us-gaap_IncomeTaxHolidayIncomeTaxBenefitsPerShare
Tax Adjustments, Settlements, and Unusual Provisions   $ (74,000,000)us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions $ 37,000,000us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability 150,000,000us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAdjustmentOfDeferredTaxAssetLiability    
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation 236,000,000us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation    
U.S. Profits Required to Realize Deferred Tax Assets 5,100,000,000glw_USProfitsRequiredToRealizeDeferredTaxAssets    
Future U.S. Profit Required Realizing Deferred Tax Assets Related to General Business Credits 110,300,000glw_FutureUSProfitRequiredRealizingDeferredTaxAssetsRelatedToGeneralBusinessCredits    
Period to Recognize U.S. Deferred Tax Assets Related to General Business Credits 20 years    
Future Foreign Sourced Income Required Realizing Deferred Tax Assets 2,100,000,000glw_FutureForeignSourcedIncomeRequiredRealizingDeferredTaxAssets    
Period to Recognize Deferred Tax Assets Associated with Foreign Tax Credits 10 years    
Deferred Tax Assets, Valuation Allowance 298,000,000us-gaap_DeferredTaxAssetsValuationAllowance 286,000,000us-gaap_DeferredTaxAssetsValuationAllowance  
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 5,000,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate 7,000,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate  
Percentage of United States Subsidiaries Join In Filing of Consolidated United States Federal Income Tax Returns 80.00%glw_PercentageOfUnitedStatesSubsidiariesJoinInFilingOfConsolidatedUnitedStatesFederalIncomeTaxReturns    
Undistributed Earnings of Foreign Subsidiaries 10,300,000,000us-gaap_UndistributedEarningsOfForeignSubsidiaries    
Foreign Tax Authority [Member]      
Note 6 - Income Taxes (Details) [Line Items]      
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability 177,000,000us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAdjustmentOfDeferredTaxAssetLiability
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
   
American Taxpayer Relief Act [Member]      
Note 6 - Income Taxes (Details) [Line Items]      
Tax Adjustments, Settlements, and Unusual Provisions   (37,000,000)us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions
/ glw_ChangeInTaxBenefitAxis
= glw_AmericanTaxpayerReliefActMember
 
Domestic Manufacturing Deduction [Member]      
Note 6 - Income Taxes (Details) [Line Items]      
Other Tax Expense (Benefit) (9,000,000)us-gaap_OtherTaxExpenseBenefit
/ glw_ChangeInTaxBenefitAxis
= glw_DomesticManufacturingDeductionMember
   
Out of Period Transfer Pricing Adjustments [Member]      
Note 6 - Income Taxes (Details) [Line Items]      
Other Tax Expense (Benefit) 46,000,000us-gaap_OtherTaxExpenseBenefit
/ glw_ChangeInTaxBenefitAxis
= glw_OutOfPeriodTransferPricingAdjustmentsMember
   
Low Or No Tax Cost [Member]      
Note 6 - Income Taxes (Details) [Line Items]      
Undistributed Earnings of Foreign Subsidiaries 10,000,000us-gaap_UndistributedEarningsOfForeignSubsidiaries
/ glw_ForeignEarningsAxis
= glw_LowOrNoTaxCostMember
   
Minimum [Member]      
Note 6 - Income Taxes (Details) [Line Items]      
U.S. Statutes of Limitations Period 3 years    
Foreign Statutes of Limitations Period 3 years    
Maximum [Member]      
Note 6 - Income Taxes (Details) [Line Items]      
U.S. Statutes of Limitations Period 5 years    
Foreign Statutes of Limitations Period 7 years    
New York State Division of Taxation and Finance [Member]      
Note 6 - Income Taxes (Details) [Line Items]      
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability $ 100,000,000us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAdjustmentOfDeferredTaxAssetLiability
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_NewYorkStateDivisionOfTaxationAndFinanceMember