Note 10 - Hedging Activities - Summary of Effect of Designated Derivative Financial Instruments on Consolidated Financial Statements (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Net sales	$ 3,680	$ 3,290
Gain (loss) recognized in other comprehensive income	34	26
Cost of sales	2,397	2,134
Cost of sales	2,397	2,134
Net income	581	599
Net income attributable to Corning Incorporated	581	599
Foreign Exchange Contract [Member]
Gain (loss) recognized in other comprehensive income	34	26
Reclassification out of Accumulated Other Comprehensive Income [Member]
Net sales	10	2
Cost of sales	7	7	[1]
Cost of sales	7	7	[1]
Net income	17	9
Net income attributable to Corning Incorporated	$ 17	$ 9

[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.