Note 14 - Reportable Segments - Schedule of Reportable Segments (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Depreciation (1)		$ 307	$ 310
Research, development and engineering expenses (2)		258	254
Income tax provision (3)		71	37
Net income attributable to Corning Incorporated		209	176
Operating Segments [Member]
Net sales of reportable segments		3,258	3,367
Depreciation (1)	[1]	305	307
Research, development and engineering expenses (2)	[2]	216	209
Income tax provision (3)	[3]	(125)	(128)
Net income attributable to Corning Incorporated		453	465
Optical Communications [Member] | Operating Segments [Member]
Net sales of reportable segments		930	1,125
Depreciation (1)	[1]	66	66
Research, development and engineering expenses (2)	[2]	65	60
Income tax provision (3)	[3]	(28)	(43)
Net income attributable to Corning Incorporated		100	159
Display Technologies [Member] | Operating Segments [Member]
Net sales of reportable segments		872	763
Depreciation (1)	[1]	116	123
Research, development and engineering expenses (2)	[2]	26	23
Income tax provision (3)	[3]	(53)	(42)
Net income attributable to Corning Incorporated		201	160
Specialty Materials [Member] | Operating Segments [Member]
Net sales of reportable segments		454	406
Depreciation (1)	[1]	36	35
Research, development and engineering expenses (2)	[2]	60	53
Income tax provision (3)	[3]	(11)	(10)
Net income attributable to Corning Incorporated		44	39
Environmental Technologies [Member] | Operating Segments [Member]
Net sales of reportable segments		455	431
Depreciation (1)	[1]	32	33
Research, development and engineering expenses (2)	[2]	23	24
Income tax provision (3)	[3]	(28)	(22)
Net income attributable to Corning Incorporated		105	82
Life Science Products [Member] | Operating Segments [Member]
Net sales of reportable segments		236	256
Depreciation (1)	[1]	17	17
Research, development and engineering expenses (2)	[2]	6	10
Income tax provision (3)	[3]	(4)	(2)
Net income attributable to Corning Incorporated		13	9
Hemlock and Emerging Growth Businesses [Member] | Operating Segments [Member]
Net sales of reportable segments		311	386
Depreciation (1)	[1]	38	33
Research, development and engineering expenses (2)	[2]	36	39
Income tax provision (3)	[3]	(1)	(9)
Net income attributable to Corning Incorporated		$ (10)	$ 16

[1] 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.

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

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