Note 6 - Income Taxes (Details) - Income Before Income Taxes (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Before Income Taxes [Abstract]
U.S. companies	$ 2,384	$ 1,274	$ 382
Non-U.S. companies	1,184	1,199	1,593
Income before income taxes	$ 3,568glw_IncomeBeforeIncomeTaxes	$ 2,473glw_IncomeBeforeIncomeTaxes	$ 1,975glw_IncomeBeforeIncomeTaxes

Sum of operating profit (loss) including equity in earnings of affiliated companies and nonoperating income (expense) before income taxes.

No definition available.

+ Details

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- Details

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- Definition

The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(h)(1)(i))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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- Definition

The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile.

+ References

+ Details

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