Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Consolidated Statements of Comprehensive Income [Abstract]
Net income attributable to Corning Incorporated	$ 427	$ 337	$ 260	$ 928
Foreign currency translation adjustments and other	283	(238)	76	(310)
Net unrealized (losses) gains on investments		(1)		1
Unamortized gains (losses) and prior service credits (costs) for postretirement benefit plans	4	4	(8)	(48)
Net unrealized gains (losses) on designated hedges	11	(22)	(31)	(20)
Other comprehensive income (loss), net of tax (Note 16)	298	(257)	37	(377)
Comprehensive income attributable to Corning Incorporated	$ 725	$ 80	$ 297	$ 551