Note 15 - Reportable Segments - Schedule of Reportable Segments (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Depreciation (1)				$ 924	$ 932
Research, development and engineering expenses (2)		$ 294	$ 270	814	787
Income tax provision (3)		3	35	124	178
Net (loss) income attributable to Corning Incorporated		(117)	164	196	621
Operating Segments [Member]
Net sales of reportable segments		3,733	3,459	10,595	10,308
Depreciation (1)	[1]	308	308	918	922
Research, development and engineering expenses (2)	[2]	248	222	686	640
Income tax provision (3)	[3]	(167)	(140)	(444)	(412)
Net (loss) income attributable to Corning Incorporated		610	509	1,618	1,499
Optical Communications [Member] | Operating Segments [Member]
Net sales of reportable segments		1,246	918	3,289	3,109
Depreciation (1)	[1]	69	65	201	195
Research, development and engineering expenses (2)	[2]	71	60	202	176
Income tax provision (3)	[3]	(49)	(24)	(118)	(105)
Net (loss) income attributable to Corning Incorporated		175	91	418	390
Display Technologies [Member] | Operating Segments [Member]
Net sales of reportable segments		1,015	972	2,901	2,663
Depreciation (1)	[1]	110	119	336	362
Research, development and engineering expenses (2)	[2]	29	26	83	73
Income tax provision (3)	[3]	(75)	(64)	(196)	(161)
Net (loss) income attributable to Corning Incorporated		285	242	744	610
Specialty Materials [Member] | Operating Segments [Member]
Net sales of reportable segments		548	563	1,503	1,392
Depreciation (1)	[1]	39	37	115	111
Research, development and engineering expenses (2)	[2]	69	62	186	172
Income tax provision (3)	[3]	(20)	(19)	(48)	(38)
Net (loss) income attributable to Corning Incorporated		72	72	179	144
Environmental Technologies [Member] | Operating Segments [Member]
Net sales of reportable segments		382	449	1,268	1,337
Depreciation (1)	[1]	32	32	96	97
Research, development and engineering expenses (2)	[2]	26	26	75	73
Income tax provision (3)	[3]	(19)	(27)	(73)	(77)
Net (loss) income attributable to Corning Incorporated		75	99	277	288
Life Science Products [Member] | Operating Segments [Member]
Net sales of reportable segments		244	230	729	717
Depreciation (1)	[1]	17	18	51	52
Research, development and engineering expenses (2)	[2]	5	7	17	25
Income tax provision (3)	[3]	(4)	(4)	(12)	(9)
Net (loss) income attributable to Corning Incorporated		15	13	45	33
Hemlock and Emerging Growth Businesses [Member] | Operating Segments [Member]
Net sales of reportable segments		298	327	905	1,090
Depreciation (1)	[1]	41	37	119	105
Research, development and engineering expenses (2)	[2]	48	41	123	121
Income tax provision (3)	[3]		(2)	3	(22)
Net (loss) income attributable to Corning Incorporated		$ (12)	$ (8)	$ (45)	$ 34

[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%.