Consolidated Statements of Income (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net sales	$ 3,290	$ 2,391
Cost of sales	2,134	1,830
Gross margin	1,156	561
Operating expenses:
Selling, general and administrative expenses	400	395
Research, development and engineering expenses	222	261
Amortization of purchased intangibles	32	26
Operating income (loss)	502	(121)
Equity in earnings of affiliated companies	8	14
Interest income	3	6
Interest expense	(77)	(64)
Translated earnings contract gain, net (Note 12)	272	68
Other income (expense), net	117	(11)
Income (loss) before income taxes	825	(108)
(Provision) benefit for income taxes (Note 5)	(226)	12
Net income (loss) attributable to Corning Incorporated	$ 599	$ (96)
Earnings (loss) per common share attributable to Corning Incorporated:
Basic (Note 6) (in dollars per share)	$ 0.75	$ (0.16)
Diluted (Note 6) (in dollars per share)	$ 0.67	$ (0.16)