Note 19 - Reportable Segments - Reportable Segments (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022		Dec. 31, 2021	Dec. 31, 2020
Net sales of reportable segments	[1]	$ 294		$ 272	$ 261
Depreciation (2)		1,329		1,352	1,399
Research, development and engineering expenses (3)		1,047		995	1,154
Income tax provision (4)		411		491	111
Net income attributable to Corning Incorporated		1,316		1,906	512
Investment in affiliated companies, at equity		261		264
Operating Segments [Member]
Net sales of reportable segments	[1]	14,805		14,120	11,452
Depreciation (2)		1,285		1,315	1,215	[2]
Research, development and engineering expenses (3)		874	[3]	838	754
Income tax provision (4)		(615)		(612)	(435)	[4]
Net income attributable to Corning Incorporated		2,254		2,296	1,628
Investment in affiliated companies, at equity		261		264	258
Segment assets (5)		18,877	[5]	19,148	19,107
Capital expenditures		1,613		1,699	928
Optical Communications [Member] | Operating Segments [Member]
Net sales of reportable segments		5,023		4,349	3,563
Depreciation (2)		249		224	242	[2]
Research, development and engineering expenses (3)		230	[3]	216	204
Income tax provision (4)		(180)		(152)	(101)	[4]
Net income attributable to Corning Incorporated		661		553	366
Investment in affiliated companies, at equity		3		3	3
Segment assets (5)		3,295	[5]	3,183	2,868
Capital expenditures		368		301	127
Display Technologies [Member] | Operating Segments [Member]
Net sales of reportable segments		3,306		3,700	3,172
Depreciation (2)		547		605	548	[2]
Research, development and engineering expenses (3)		124	[3]	110	99
Income tax provision (4)		(203)		(249)	(190)	[4]
Net income attributable to Corning Incorporated		769		960	717
Investment in affiliated companies, at equity		102		109	107
Segment assets (5)		8,104	[5]	8,672	8,842
Capital expenditures		495		710	311
Specialty Materials [Member] | Operating Segments [Member]
Net sales of reportable segments		2,002		2,008	1,884
Depreciation (2)		155		161	162	[2]
Research, development and engineering expenses (3)		222	[3]	208	155
Income tax provision (4)		(90)		(99)	(113)	[4]
Net income attributable to Corning Incorporated		340		371	423
Investment in affiliated companies, at equity		8		6	4
Segment assets (5)		2,419	[5]	2,328	2,571
Capital expenditures		306		183	125
Environmental Technologies [Member] | Operating Segments [Member]
Net sales of reportable segments		1,584		1,586	1,370
Depreciation (2)		128		139	132	[2]
Research, development and engineering expenses (3)		98	[3]	111	100
Income tax provision (4)		(78)		(72)	(52)	[4]
Net income attributable to Corning Incorporated		292		269	197
Investment in affiliated companies, at equity
Segment assets (5)		2,061	[5]	2,150	1,986
Capital expenditures		110		228	159
Life Science Products [Member] | Operating Segments [Member]
Net sales of reportable segments		1,228		1,234	998
Depreciation (2)		60		52	50	[2]
Research, development and engineering expenses (3)		37	[3]	33	26
Income tax provision (4)		(40)		(51)	(37)	[4]
Net income attributable to Corning Incorporated		153		194	139
Investment in affiliated companies, at equity		4		4	2
Segment assets (5)		862	[5]	791	683
Capital expenditures		116		128	83
Hemlock and Emerging Growth Businesses [Member] | Operating Segments [Member]
Net sales of reportable segments	[6],[7]	1,662		1,243	465
Depreciation (2)	[6]	146		134	81	[2]
Research, development and engineering expenses (3)	[6]	163	[3]	160	170
Income tax provision (4)	[6]	(24)		11	58	[4]
Net income attributable to Corning Incorporated	[6]	39		(51)	(214)
Investment in affiliated companies, at equity	[6]	144		142	142
Segment assets (5)	[6]	2,136	[5]	2,024	2,157
Capital expenditures	[6]	$ 218		$ 149	$ 123

[1] Net sales are attributed to countries based on location of customer.

[2] Depreciation expense for Corning’s reportable segments and Hemlock and Emerging Growth Businesses includes an allocation of depreciation of corporate property not specifically identifiable to a segment.

[3] Research, development and engineering expenses include direct project spending that is identifiable to a segment.

[4] Income tax (provision) benefit reflects a tax rate of 21%.

[5] Segment assets include inventory, accounts receivable, property, plant and equipment, net of accumulated depreciation, and associated equity companies.

[6] Corning obtained a controlling interest in HSG during the third quarter of 2020 and has consolidated results in Hemlock and Emerging Growth Businesses since September 9, 2020. Refer to Note 3 (HSG Transactions and Acquisitions) in the notes to the consolidated financial statements for additional information.

[7] Corning obtained a controlling interest in HSG during the third quarter of 2020 and has consolidated results in Hemlock and Emerging Growth Businesses since September 9, 2020. Refer to Note 3 (HSG Transactions and Acquisitions) in the notes to the consolidated financial statements for more information.