Note 4 - Earnings Per Common Share - Reconciliation of Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Net income attributable to Corning Incorporated	$ 176	$ 581
Weighted-average common shares outstanding – basic (in shares)	844	843
Stock options and other dilutive securities (in shares)	15	16
Weighted-average common shares outstanding – diluted (in shares)	859	859
Basic (Note 4) (in dollars per share)	$ 0.21	$ 0.69
Diluted (Note 4) (in dollars per share)	$ 0.20	$ 0.68
Share-Based Payment Arrangement [Member]
Total (in shares)	5