Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Oct. 19, 2018
Document And Entity Information
Entity Registrant Name	CORNING INC /NY
Entity Central Index Key	0000024741
Trading Symbol	glw
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding		800,399,090