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Note 18 - Reportable Segments (Details) - Reportable Segments - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales |  | $ 2,343 | $ 2,482 | $ 4,608 | $ 4,771
Depreciation |  |  |  | 562 | 583
Amortization of purchased intangibles |  | 16 | 8 | 28 | 16
Research, development and engineering expenses |  | 191 | 208 | 380 | 406
Restructuring, impairment & other charges |  |  | 34 |  | 51
Equity in earnings of affiliated companies |  | 62 | 62 | 156 | 148
Income tax (provision) benefit |  | (110) | (172) | (196) | (352)
NetIncomeLoss |  | 496 | 169 | 903 | 470
Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales |  | 2,343 | 2,482 | 4,608 | 4,771
Depreciation | [1] | 280 | 290 | 553 | 576
Amortization of purchased intangibles |  | 16 | 8 | 27 | 16
Research, development and engineering expenses | [2] | 163 | 183 | 324 | 352
Restructuring, impairment & other charges |  | 3 | 34 | 2 | 51
Equity in earnings of affiliated companies |  | 3 | 4 | 3 | (2)
Income tax (provision) benefit |  | (205) | (181) | (395) | (427)
NetIncomeLoss | [3] | 443 | 388 | 848 | 675
Display Technologies [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales |  | 789 | 987 | 1,597 | 1,916
Depreciation | [1] | 152 | 171 | 308 | 344
Research, development and engineering expenses | [2] | 26 | 41 | 50 | 86
Restructuring, impairment & other charges |  |  | 24 |  | 29
Equity in earnings of affiliated companies |  | (3) | (4) | (5) | (13)
Income tax (provision) benefit |  | (136) | (119) | (268) | (317)
NetIncomeLoss | [3] | 303 | 282 | 597 | 491
Optical Communications [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales |  | 800 | 686 | 1,497 | 1,279
Depreciation | [1] | 43 | 37 | 81 | 73
Amortization of purchased intangibles |  | 11 | 2 | 17 | 4
Research, development and engineering expenses | [2] | 35 | 34 | 68 | 71
Restructuring, impairment & other charges |  |  |  | (1) | 12
Income tax (provision) benefit |  | (37) | (31) | (66) | (50)
NetIncomeLoss | [3] | 77 | 61 | 134 | 88
Environmental Technologies [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales |  | 260 | 285 | 542 | 560
Depreciation | [1] | 32 | 30 | 61 | 60
Research, development and engineering expenses | [2] | 23 | 21 | 46 | 42
Equity in earnings of affiliated companies |  |  | 1 |  | 2
Income tax (provision) benefit |  | (22) | (23) | (45) | (44)
NetIncomeLoss | [3] | 46 | 47 | 94 | 90
Specialty Materials [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales |  | 272 | 298 | 544 | 559
Depreciation | [1] | 27 | 29 | 53 | 56
Research, development and engineering expenses | [2] | 29 | 34 | 60 | 67
Restructuring, impairment & other charges |  | 3 |  | 3 |
Income tax (provision) benefit |  | (22) | (21) | (43) | (37)
NetIncomeLoss | [3] | 44 | 39 | 82 | 70
Life Sciences [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales |  | 211 | 223 | 408 | 433
Depreciation | [1] | 15 | 16 | 30 | 31
Amortization of purchased intangibles |  | 5 | 6 | 10 | 12
Research, development and engineering expenses | [2] | 6 | 5 | 11 | 10
Income tax (provision) benefit |  | (9) | (9) | (17) | (17)
NetIncomeLoss | [3] | 18 | 18 | 34 | 35
Other Segments [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales |  | 11 | 3 | 20 | 24
Depreciation | [1] | 11 | 7 | 20 | 12
Research, development and engineering expenses | [2] | 44 | 48 | 89 | 76
Restructuring, impairment & other charges |  |  | 10 |  | 10
Equity in earnings of affiliated companies |  | 6 | 7 | 8 | 9
Income tax (provision) benefit |  | 21 | 22 | 44 | 38
NetIncomeLoss | [3] | $ (45) | $ (59) | $ (93) | $ (99)
[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] | 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.

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