Note 10 - Property, Plant and Equipment, Net of Accumulated Depreciation (Details) (USD $)	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Interest Costs Capitalized	$ 10,000,000us-gaap_InterestCostsCapitalized	$ 10,000,000us-gaap_InterestCostsCapitalized
Precious Metals	3,100,000,000glw_PreciousMetals		3,100,000,000glw_PreciousMetals
Depletion	$ 7,000,000us-gaap_Depletion	$ 8,000,000us-gaap_Depletion

Amount of interest capitalized during the period.

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Allowance for Funds Used during Construction

-URI http://asc.fasb.org/extlink&oid=6504829

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391

Name:	us-gaap_InterestCostsCapitalized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration