2.2.0.25falsefalse40605 - Disclosure - Income Taxes (Reconciliation of U.S.)truefalsefalse1falsefalseUSDfalsefalse1/1/2010 - 12/31/2010 USD ($) USD ($) / shares $Duration_1_1_2010_To_12_31_2010http://www.sec.gov/CIK0000024741duration2010-01-01T00:00:002010-12-31T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit14Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0Unit1Standardhttp://www.xbrl.org/2003/instancesharesxbrli0Unit13Standardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$2falsefalseUSDfalsefalse1/1/2009 - 12/31/2009 USD ($) USD ($) / shares $Duration_1_1_2009_To_12_31_2009http://www.sec.gov/CIK0000024741duration2009-01-01T00:00:002009-12-31T00:00:00Unit13Standardhttp://www.xbrl.org/2003/instancepurexbrli0Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit1Standardhttp://www.xbrl.org/2003/instancesharesxbrli0Unit14Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$3falsefalseUSDfalsefalse1/1/2008 - 12/31/2008 USD ($) USD ($) / shares $Duration_1_1_2008_To_12_31_2008http://www.sec.gov/CIK0000024741duration2008-01-01T00:00:002008-12-31T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit13Standardhttp://www.xbrl.org/2003/instancepurexbrli0Unit14Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0Unit1Standardhttp://www.xbrl.org/2003/instancesharesxbrli0USDUSD$2true0glw_IncomeTaxesAbstractglwfalsenadurationIncome Taxes [Abstract]falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringIncome Taxes [Abstract]falsefalseIncome Taxes3false0us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRateus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truetruefalse0.350.35falsefalsefalsefalsefalse2truetruefalse0.350.35falsefalsefalsefalsefalse3truetruefalse0.350.35falsefalsefalsefalsefalseOtherus-types:percentItemTypepureThe domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate shall be the regular tax rate if there are alternative tax systems.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 47 falsefalseStatutory U.S. income tax (benefit) rate4false0us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxesus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truetruefalse0.0010.001falsefalsefalsefalsefalse2truetruefalse-0.005-0.005falsefalsefalsefalsefalse3truetruefalse0.0010.001falsefalsefalsefalsefalseOtherus-types:percentItemTypepureThe portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by the state and local income tax expense (benefit), net of the federal tax benefit (expense) thereon, recorded during the period.No authoritative reference available.falsefalseState income tax (benefit), net of federal effect5false0us-gaap_EffectiveIncomeTaxRateReconciliationTaxHolidaysus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truetruefalse-0.031-0.031[1]falsefalsefalsefalsefalse2truetruefalse-0.073-0.073[1]falsefalsefalsefalsefalse3truetruefalse-0.053-0.053[1]falsefalsefalsefalsefalseOtherus-types:percentItemTypepureThe portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to income that is exempt from income tax because of tax holidays an entity has received. A tax "holiday" refers to the tax benefit derived from a jurisdiction that provides an exemption from income taxes for some defined period of time as an incentive to attract business.No authoritative reference available.falsefalseTax holidays6false0us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truetruefalse-0.009-0.009[2]falsefalsefalsefalsefalse2truetruefalse-0.037-0.037[2],[3]falsefalsefalsefalsefalse3truetruefalse-0.006-0.006[2]falsefalsefalsefalsefalseOtherus-types:percentItemTypepureThe sum of the differences between the effective income tax rate and domestic federal statutory income tax rate that can be explained by all tax credits generated or utilized under enacted tax laws during the period.No authoritative reference available.falsefalseInvestment and other tax credits7false0us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferentialus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truetruefalse-0.022-0.022falsefalsefalsefalsefalse2truetruefalse-0.012-0.012falsefalsefalsefalsefalse3truetruefalse0.020.02falsefalsefalsefalsefalseOtherus-types:percentItemTypepureThe portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by the difference between statutory income tax rates in foreign jurisdictions and the domestic federal statutory income tax rate recorded during the period.No authoritative reference available.falsefalseRate difference on foreign earnings8false0us-gaap_EffectiveIncomeTaxRateReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiaryus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truetruefalse-0.166-0.166[4]falsefalsefalsefalsefalse2truetruefalse-0.242-0.242[4]falsefalsefalsefalsefalse3truetruefalse-0.154-0.154[4]falsefalsefalsefalsefalseOtherus-types:percentItemTypepureThe portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to the equity in earnings (losses) of unconsolidated subsidiaries that is exempt from income taxes under enacted tax laws.No authoritative reference available.falsefalseEquity earnings impact9false0us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarningsJobsCreationActOf2004us-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse-6.6-6.6[5]falsetruefalsefalsefalse2truefalsefalse-0.2-0.2falsetruefalsefalsefalse3truefalsefalse1.01.0falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe portion of the difference between total income tax expense (benefit) as reported in the Income Statement for the period and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to the temporary incentive for US corporations to repatriate accumulated foreign earnings under the American Jobs Creation Act of 2004.No authoritative reference available.falsefalseDividend repatriation10false0glw_DeferredTaxAdjustmentglwfalsenadurationDeferred tax adjustments related to OPEB subsidies.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truetruefalse0.0150.015[6]falsefalsefalsefalsefalse2truetruefalse-0.021-0.021[6]falsefalsefalsefalsefalse3falsetruefalse00falsefalsefalsefalsefalseOtherus-types:percentItemTypepureDeferred tax adjustments related to OPEB subsidies.No authoritative reference available.falsefalseDeferred tax adjustment11false0glw_ReleaseOfPriorPeriodValuationAllowancesglwfalsenadurationEffective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Release of Prior Period...falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1falsetruefalse00falsefalsefalsefalsefalse2truetruefalse0.0060.006falsefalsefalsefalsefalse3truetruefalse-0.891-0.891[7]falsefalsefalsefalsefalseOtherus-types:percentItemTypepureEffective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Release of Prior Period Valuation AllowancesNo authoritative reference available.falsefalseRelease of prior period valuation allowances12false0glw_TaxExpensesBenefitsNotRecordedOnIncomeLossesglwfalsenadurationEffective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Tax (Expenses) Benefits Not...falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truetruefalse0.0010.001[8]falsefalsefalsefalsefalse2truetruefalse0.0040.004[8]falsefalsefalsefalsefalse3truetruefalse-0.087-0.087[8]falsefalsefalsefalsefalseOtherus-types:percentItemTypepureEffective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Tax (Expenses) Benefits Not Recorded On (Income) LossesNo authoritative reference available.falsefalseTax (expenses) benefits not recorded on (income) losses13false0us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlementsOtherus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsetruefalse00falsefalsefalsefalsefalse2truetruefalse-0.001-0.001[9]falsefalsefalsefalsefalse3truetruefalse-0.014-0.014[9]falsefalsefalsefalsefalseOtherus-types:percentItemTypepureThe portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to other income tax settlements during the period not otherwise listed in the existing taxonomy.No authoritative reference available.falsefalseAudit settlement14false0us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustmentsus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truetruefalse0.0020.002falsefalsefalsefalsefalse2truetruefalse-0.005-0.005falsefalsefalsefalsefalse3falsetruefalse00falsefalsefalsefalsefalseOtherus-types:percentItemTypepureThe portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to all other items not otherwise listed in the existing taxonomy.No authoritative reference available.falsefalseOther items, net15false0us-gaap_EffectiveIncomeTaxRateContinuingOperationsus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truetruefalse0.0750.075falsefalsefalsefalsefalse2truetruefalse-0.038-0.038falsefalsefalsefalsefalse3truetruefalse-0.824-0.824falsefalsefalsefalsefalseOtherus-types:percentItemTypepureA ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 47 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 falsefalseEffective income tax (benefit) rate1Certain foreign subsidiaries in China and Taiwan are operating under tax holiday arrangements. The nature and extent of such arrangements vary, and the benefits of existing arrangements phase out in future years (through 2014) according to the specific terms and schedules of the relevant taxing jurisdictions. The impact of tax holidays on net income per share on a diluted basis was $0.08 in 2010, $0.09 in 2009, and $0.10 in 2008. 2Primarily related to investment tax credits in Taiwan, employment credits in Mexico and research & development credits in U.S. and France. 3In 2009, we recorded a $37 million tax credit for U.S. Research and Experimentation – expenses incurred from 2005-2009. 4Equity in earnings of nonconsolidated affiliates reported in the financials net of tax. 5In 2010, we recorded a $265 million tax benefit for excess foreign tax credits that resulted from the repatriation of current year earnings of certain foreign subsidiaries. 6In 2009, we recorded an additional deferred tax asset related to tax free OPEB subsidies. In 2010, we recorded $56 million charge to write-off deferred tax associated with OPEB subsidy due to a law change. 7In 2008, we released $2.5 billion of valuation allowances resulting from a change in judgment about the realizability of deferred tax assets established in prior years, as described below. 8For all three years presented, we generated positive income from continuing operations in the U.S. In 2008, the current year's tax expense on such income was fully offset by the tax benefit of releasing a portion of valuation allowance to reflect the realization of deferred taxes resulting from the generation of U.S. income. The impact of the release of valuation allowance and consequently not recording tax expense on income generated in the U.S. was a reduction in the rate of 8.6 percentage points for 2008. 9In 2009 and 2008, we recorded a $2 million and $40 million benefit, respectively, related to a favorable tax settlement with the Canadian Revenue Agency. 314Income Taxes (Reconciliation of U.S.) (USD $)NoRoundingUnKnownUnKnownUnKnowntruetrue