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Reportable Segments (Narrative) (Details) | 9 Months Ended
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Sep. 30, 2018 item
Reportable Segments [Abstract] |
Number of Material Formulations | 150
Segment tax rate | 21.00%

X
- 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

X
- Definition Segment Tax Rate + References No definition available. + Details
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Namespace Prefix: | glw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration