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		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Net income attributable to Corning Incorporated	$ 281	$ 563	$ 457	$ 1,144
Weighted-average common shares outstanding – basic (in shares)	848	843	846	843
Stock options and other awards (in shares)	11	13	13	14
Weighted-average common shares outstanding – diluted (in shares)	859	856	859	857
Basic (Note 4) (in dollars per share)	$ 0.33	$ 0.67	$ 0.54	$ 1.36
Diluted (Note 4) (in dollars per share)	$ 0.33	$ 0.66	$ 0.53	$ 1.33
Stock options and other awards (in shares)	3	2	3	2