Note 15 - Hedging Activities - Summary of Effect of Designated Derivative Financial Instruments on Consolidated Financial Statements (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net sales		$ 14,082	$ 11,303	$ 11,503
Cost of sales		9,019	7,772	7,468
Gain (loss) recognized in other comprehensive income		47	(19)	72
Other expense, net		185	(60)	(155)
Net income attributable to Corning Incorporated		1,906	512	960
Foreign Exchange Contract [Member]
Gain (loss) recognized in other comprehensive income		47	(19)	72
Reclassification out of Accumulated Other Comprehensive Income [Member]
Net sales		14	(6)
Cost of sales		39	13	11
Other expense, net	[1]		(14)
Net income attributable to Corning Incorporated		$ 53	$ (7)	$ 11

[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.