2.2.0.25falsefalse41307 - Disclosure - Employee Retirement Plans (Assumed rate of return determined on current interest rate environment and historical market premiums relative to fixed income rates of equities and other asset classes) (Details)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$2true0glw_EmployeeRetirementPlansAbstractglwfalsenadurationEmployee Retirement Plans [Abstract]falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringEmployee Retirement Plans [Abstract]falsefalseEmployee Retirement Plans3false0us-gaap_DefinedBenefitPlanHealthCareCostTrendRateAssumedForNextFiscalYearus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truetruefalse0.080.08falsefalsefalsefalsefalse2truetruefalse0.0850.085falsefalsefalsefalsefalseOtherus-types:percentItemTypepureThe assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph l falsefalseHealth care cost trend rate assumed for next year4false0glw_DefinedBenefitPlanHealthCareCostTrendRateDeclineglwfalsenadurationDefined benefit plan health care cost trend rate declinefalsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truetruefalse0.050.05falsefalsefalsefalsefalse2truetruefalse0.050.05falsefalsefalsefalsefalseOtherus-types:percentItemTypepureDefined benefit plan health care cost trend rate declineNo authoritative reference available.falsefalseRate that the cost trend rate gradually declines to5false0us-gaap_DefinedBenefitPlanYearThatRateReachesUltimateTrendRateus-gaaptruenainstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse002017falsefalsefalsefalsefalse2falsefalsefalse002017falsefalsefalsefalsefalseOtherxbrli:gYearItemTypepositiveintegerThe year when the ultimate health care cost trend rate is expected to be reached.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph l falsefalseYear that the rate reaches the ultimate trend rate24Employee Retirement Plans (Assumed rate of return determined on current interest rate environment and historical market premiums relative to fixed income rates of equities and other asset classes) (Details)UnKnownUnKnownUnKnownUnKnowntruetrue