Represents the cap on the Company's contribution toward future retiree medical coverage.

No definition available.

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- Definition

Represents the percentage of plan assets which are invested in long duration bonds.

+ References

No definition available.

+ Details

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- Definition

Percent of assets which are invested in non-U.S. dollar denominated investments.

+ References

No definition available.

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- Definition

Number of years the Company has utilized the RP 2000 mortality table to perform valuations of its U.S. pension and OPEB liabilities.

+ References

No definition available.

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- Definition

The amount of voluntary contributions made by the entity to fund its defined benefit plans.

+ References

No definition available.

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- Definition

Represents the four grading sources, namely Moody's, S&P, Fitch and the Dominion Bond Rating Service.

+ References

No definition available.

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- Definition

Percent of securities which are level 3 securities in private equity and private real estate.

+ References

No definition available.

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- Details

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- Definition

Represents the number of bonds used to develop a hypothetical yield curve.

+ References

No definition available.

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- Definition

Represents the percentage of the cost to be paid by employees for retiree medical benefits upon retirement. This is applicable to employees hired or rehired on or after January 1, 2007.

+ References

No definition available.

+ Details

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- Definition

Represents the yield of a bond in percent.

+ References

No definition available.

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- Definition

For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Accumulated Benefit Obligation

-URI http://asc.fasb.org/extlink&oid=6503844

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (e)

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- Definition

Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Glossary Gain or Loss

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-Name Accounting Standards Codification

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-SubTopic 60

-Glossary Gain or Loss

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- Definition

Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

+ References

No definition available.

+ Details

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- Definition

Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

+ References

No definition available.

+ Details

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- Definition

Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position.

+ References

+ Details

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- Definition

Target allocation of investments of this type to total plan assets presented on a weighted average basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

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-Paragraph 1

-Subparagraph (d)(i)

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- Definition

Target allocation maximum percentage of investments of this type to total plan assets presented on a weighted average basis.

+ References

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- Definition

Target allocation minimum percentage of investments of this type to total plan assets presented on a weighted average basis.

+ References

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- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 70

-Section 50

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Note 13 - Employee Retirement Plans (Details) (USD $)	12 Months Ended			3 Months Ended
Note 13 - Employee Retirement Plans (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014
Note 13 - Employee Retirement Plans (Details) [Line Items]
Cap on Contribution Toward Future Retiree Medical Coverage	120.00%			120.00%
Percentage of Cost to be Paid by Employees for Retiree Medical Upon Retirement	100.00%			100.00%
Defined Benefit Plan, Accumulated Benefit Obligation (in Dollars)	$ 3,600,000,000	$ 3,200,000,000		$ 3,600,000,000
Grading Sources	4glw_GradingSources
Defined Benefit Plan, Number of Years RP 2000 Mortality Table Is Used	7
Defined Benefit Plan, Actuarial Gain (Loss) (in Dollars)	(394,000,000)	362,000,000
Credit Risk of Plan Assets Long Duration Corporate Bonds	61.00%
Currency Fluctuations Assets Invested in Non-US Investments	12.00%
Liquidity Risk Long Term Investments in Private Equity and Real Estate	10.00%
Defined Contribution Plan, Cost Recognized (in Dollars)	62,000,000	63,000,000	50,000,000
Equity Securities [Member]
Note 13 - Employee Retirement Plans (Details) [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	20.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	25.00%
Bond Investments [Member]
Note 13 - Employee Retirement Plans (Details) [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	60.00%
Private Equity and Real Estate [Member]
Note 13 - Employee Retirement Plans (Details) [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	5.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	15.00%
Commodities [Member]
Note 13 - Employee Retirement Plans (Details) [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	0.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	5.00%
Maximum [Member] \| United States Pension Plan of US Entity [Member]
Note 13 - Employee Retirement Plans (Details) [Line Items]
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year (in Dollars)	65,000,000
Maximum [Member] \| Foreign Pension Plan [Member]
Note 13 - Employee Retirement Plans (Details) [Line Items]
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year (in Dollars)	28,000,000
Maximum [Member]
Note 13 - Employee Retirement Plans (Details) [Line Items]
Number of Bonds	375
Percent to Yield	10.00%
Minimum [Member]
Note 13 - Employee Retirement Plans (Details) [Line Items]
Number of Bonds	350
Percent to Yield	40.00%
United States Pension Plan of US Entity [Member]
Note 13 - Employee Retirement Plans (Details) [Line Items]
Defined Benefit Plan Voluntary Contributions by Employer (in Dollars)	85,000,000	0
Defined Benefit Plan, Actuarial Gain (Loss) (in Dollars)	(327,000,000)	368,000,000
Foreign Pension Plan [Member]
Note 13 - Employee Retirement Plans (Details) [Line Items]
Defined Benefit Plan Voluntary Contributions by Employer (in Dollars)	45,000,000	5,000,000
Defined Benefit Plan, Actuarial Gain (Loss) (in Dollars)	(67,000,000)	(6,000,000)
Pension Plan [Member]
Note 13 - Employee Retirement Plans (Details) [Line Items]
Defined Benefit Plan, Future Amortization of Prior Service Cost (Credit) (in Dollars)	6,000,000
Other Postretirement Benefit Plan [Member]
Note 13 - Employee Retirement Plans (Details) [Line Items]
Defined Benefit Plan, Future Amortization of Prior Service Cost (Credit) (in Dollars)	(6,000,000)
Defined Benefit Plan, Future Amortization of Gain (Loss) (in Dollars)	(5,000,000)
Defined Benefit Plan, Actuarial Gain (Loss) (in Dollars)	(49,000,000)	178,000,000
Mortality Table Change [Member]
Note 13 - Employee Retirement Plans (Details) [Line Items]
Defined Benefit Plan, Actuarial Gain (Loss) (in Dollars)				$ 88,000,000