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Note 15 - Reportable Segments - Reportable Segments (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Depreciation (1)     $ 1,014 $ 1,005
Research, development and engineering expenses (2) $ 278 $ 251 766 715
Income tax provision (3) 34 109 380 402
Net income attributable to Corning Incorporated 208 371 1,352 1,419
Operating Segments [Member]        
Net sales of reportable segments 3,666 3,639 11,172 10,406
Depreciation (1) [1] 408 339 1,089 998
Research, development and engineering expenses (2) [2] 235 218 651 605
Income tax provision (3) [3] (153) (159) (483) (453)
Net income attributable to Corning Incorporated [4] 561 593 1,771 1,701
Optical Communications [Member] | Operating Segments [Member]        
Net sales of reportable segments 1,317 1,131 3,828 3,143
Depreciation (1) [1] 96 58 223 174
Research, development and engineering expenses (2) [2] 60 57 173 160
Income tax provision (3) [3] (50) (38) (146) (184)
Net income attributable to Corning Incorporated [4] 183 139 531 398
Display Products [Member] | Operating Segments [Member]        
Net sales of reportable segments 686 956 2,523 2,758
Depreciation (1) [1] 151 153 453 450
Research, development and engineering expenses (2) [2] 31 31 92 79
Income tax provision (3) [3] (35) (64) (157) (109)
Net income attributable to Corning Incorporated [4] 134 247 598 708
Specialty Materials [Member] | Operating Segments [Member]        
Net sales of reportable segments 519 556 1,497 1,490
Depreciation (1) [1] 56 42 138 125
Research, development and engineering expenses (2) [2] 66 49 163 143
Income tax provision (3) [3] (26) (28) (70) (74)
Net income attributable to Corning Incorporated [4] 96 107 262 279
Environmental Technologies [Member] | Operating Segments [Member]        
Net sales of reportable segments 425 385 1,190 1,233
Depreciation (1) [1] 44 34 111 105
Research, development and engineering expenses (2) [2] 25 28 74 84
Income tax provision (3) [3] (23) (16) (59) (57)
Net income attributable to Corning Incorporated [4] 87 60 223 215
Life Science Products [Member] | Operating Segments [Member]        
Net sales of reportable segments 312 305 934 917
Depreciation (1) [1] 23 14 53 40
Research, development and engineering expenses (2) [2] 10 9 28 25
Income tax provision (3) [3] (11) (12) (32) (39)
Net income attributable to Corning Incorporated [4] 43 45 122 145
Hemlock and Emerging Growth Businesses [Member]        
Net sales of reportable segments 407 306 1,200 865
Depreciation (1) [1] 38 38 111 104
Research, development and engineering expenses (2) [2] 43 44 121 114
Income tax provision (3) [3] (8) (1) (19) 10
Net income attributable to Corning Incorporated [4] $ 18 $ (5) $ 35 $ (44)
[1] Depreciation expense for Corning’s reportable segments 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%.
[4] Many of Corning’s administrative and staff functions are performed on a centralized basis. Where practicable, Corning charges these expenses to segments based upon the extent to which each business uses a centralized function. Other staff functions, such as corporate finance, human resources and legal, are allocated to segments, primarily as a percentage of sales. Expenses that are not allocated to the segments are included in the reconciliation of reportable segment net income (loss) to consolidated net income.