Consolidated Statements of Income (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2021		Jun. 30, 2020	Jun. 30, 2021		Jun. 30, 2020
Net sales	$ 3,501		$ 2,561	$ 6,791		$ 4,952
Cost of sales	2,186		1,805	4,320		3,635
Gross margin	1,315		756	2,471		1,317
Operating expenses:
Selling, general and administrative expenses	465		401	865		796
Research, development and engineering expenses	242		430	464		691
Amortization of purchased intangibles	33		28	65		54
Operating income (loss)	575		(103)	1,077		(224)
Equity in earnings of affiliated companies	7		79	15		93
Interest income	2		3	5		9
Interest expense	(78)		(67)	(155)		(131)
Translated earnings contract gain, net (Note 12)	3		37	275		105
Other income (expense), net	7		2	124		(9)
Income (loss) before income taxes	516		(49)	1,341		(157)
Provision for income taxes (Note 5)	(67)		(22)	(293)		(10)
Net income (loss) attributable to Corning Incorporated	$ 449		$ (71)	$ 1,048		$ (167)
(Loss) earnings per common share available to common stockholders:
Basic (Note 6) (in dollars per share)	$ (0.42)		$ (0.13)	$ 0.27		$ (0.28)
Diluted (Note 6) (in dollars per share)	$ (0.42)		$ (0.13)	$ 0.27		$ (0.28)
Net income (loss)	$ 449		$ (71)	$ 1,048		$ (167)
Series A convertible preferred stock dividend			(25)	(24)		(49)
Excess consideration paid for redemption of preferred shares (1)	(803)	[1]		(803)	[1]
Net (loss) income available to common stockholders	$ (354)		$ (96)	$ 221		$ (216)

[1] Refer to Note 6 ((Loss) Earnings per Share) and Note 14 (Shareholders' Equity) to the consolidated financial statements for additional information.