Document And Entity Information - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2019	Feb. 10, 2020	Jun. 30, 2019
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2019
Document Transition Report	false
Entity File Number	1-3247
Entity Registrant Name	CORNING INC /NY
Entity Incorporation, State or Country Code	NY
Entity Tax Identification Number	16-0393470
Entity Address, Address Line One	One Riverfront Plaza
Entity Address, City or Town	Corning
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	14831
City Area Code	607
Local Phone Number	974-9000
Title of 12(b) Security	Common Stock
Trading Symbol	GLW
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 25
Entity Common Stock, Shares Outstanding		763,628,266
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Central Index Key	0000024741
Current Fiscal Year End Date	--12-31
Documents Incorporated by Reference [Text Block]	Portions of the Registrant’s Definitive Proxy Statement dated March 20, 2020, and filed for the Registrant’s 2020 Annual Meeting of Shareholders are incorporated into Part III of this Annual Report on Form 10-K, as specifically set forth in Part III.