| Document And Entity Information | Jul. 28, 2020 |
| Document And Entity Information [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Jul. 28, 2020 |
| Entity Registrant Name | CORNING INC /NY |
| Entity Incorporation, State or Country Code | NY |
| Entity File Number | 1-3247 |
| 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 |
| Entity Emerging Growth Company | false |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock |
| Trading Symbol | GLW |
| Security Exchange Name | NYSE |
| Entity Central Index Key | 0000024741 |
| Amendment Flag | false |
