Note 10 - Hedging Activities - Summary of Effect of Designated Derivative Financial Instruments on Consolidated Financial Statements (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021		Jun. 30, 2022	Jun. 30, 2021
Net sales	$ 3,615	$ 3,501		$ 7,295	$ 6,791
Gain (loss) recognized in other comprehensive income	(14)	15		20	41
Cost of sales	2,369	2,186		4,766	4,320
Net income attributable to Corning Incorporated	563	449		1,144	1,048
Foreign Exchange Contract [Member]
Gain (loss) recognized in other comprehensive income	(14)	15		20	41
Reclassification out of Accumulated Other Comprehensive Income [Member]
Net sales	13	4		23	6
Cost of sales	6	10	[1]	13	17	[1]
Net income attributable to Corning Incorporated	$ 19	$ 14		$ 36	$ 23

[1] A loss of $14 million was reclassified from accumulated other comprehensive loss into other expense, net, resulting from the de-designation of certain cash flow hedges during the year ended December 31, 2020.