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Reportable Segments (Narrative) (Details)	3 Months Ended
	Mar. 31, 2019 item
Reportable Segments [Abstract]
Number of Material Formulations	150

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- Definition

The number of material formulations for glass, glass ceramics and fluoride crystals provided by the Specialty Materials Segment.

+ References

No definition available.

+ Details

Name:	glw_NumberOfMaterialFormulations
Namespace Prefix:	glw_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_SegmentReportingAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration