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Reportable Segments (Reportable Segments) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Net sales |  | $ 3,008 | $ 2,607 | $ 8,255 | $ 7,479
Depreciation |  |  |  | 895 | 799
Research, development and engineering expenses |  | 244 | 215 | 728 | 623
Income tax (provision) benefit |  | (133) | (89) | (383) | (176)
Net income |  | 625 | 390 | 774 | 915
Operating Segments [Member] |  |  |  |  |
Net sales |  | 3,045 | 2,635 | 8,317 | 7,583
Depreciation | [1] | (287) | 274 | 857 | 795
Research, development and engineering expenses | [2] | 213 | 190 | 627 | 550
Income tax (provision) benefit |  | (139) | (114) | (341) | (340)
Net income | [3] | 520 | 430 | 1,278 | 1,272
Display Technologies [Member] | Operating Segments [Member] |  |  |  |  |
Net sales |  | 852 | 795 | 2,377 | 2,354
Depreciation | [1] | (146) | 134 | 436 | 393
Research, development and engineering expenses | [2] | 26 | 21 | 76 | 63
Income tax (provision) benefit |  | (57) | (56) | (157) | (180)
Net income | [3] | 218 | 211 | 595 | 682
Optical Communications [Member] | Operating Segments [Member] |  |  |  |  |
Net sales |  | 1,117 | 917 | 3,026 | 2,617
Depreciation | [1] | (55) | 49 | 160 | 142
Research, development and engineering expenses | [2] | 53 | 44 | 153 | 121
Income tax (provision) benefit |  | (46) | (35) | (117) | (100)
Net income | [3] | 168 | 132 | 427 | 370
Specialty Materials [Member] | Operating Segments [Member] |  |  |  |  |
Net sales |  | 459 | 373 | 1,080 | 1,010
Depreciation | [1] | (34) | 34 | 102 | 94
Research, development and engineering expenses | [2] | 43 | 38 | 123 | 111
Income tax (provision) benefit |  | (31) | (22) | (60) | (56)
Net income | [3] | 116 | 86 | 226 | 213
Environmental Technologies [Member] | Operating Segments [Member] |  |  |  |  |
Net sales |  | 331 | 277 | 970 | 815
Depreciation | [1] | (30) | 31 | 89 | 93
Research, development and engineering expenses | [2] | 28 | 28 | 86 | 80
Income tax (provision) benefit |  | (16) | (11) | (44) | (33)
Net income | [3] | 60 | 40 | 166 | 122
Life Sciences [Member] | Operating Segments [Member] |  |  |  |  |
Net sales |  | 231 | 223 | 708 | 654
Depreciation | [1] | (12) | 14 | 39 | 39
Research, development and engineering expenses | [2] | 5 | 6 | 15 | 18
Income tax (provision) benefit |  | (8) | (7) | (23) | (19)
Net income | [3] | 30 | 25 | 88 | 71
All Other [Member] | Operating Segments [Member] |  |  |  |  |
Net sales |  | 55 | 50 | 156 | 133
Depreciation | [1] | (10) | 12 | 31 | 34
Research, development and engineering expenses | [2] | 58 | 53 | 174 | 157
Income tax (provision) benefit |  | 19 | 17 | 60 | 48
Net income | [3] | $ (72) | $ (64) | $ (224) | $ (186)
[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. Expenses that are not allocated to the segments are included in the reconciliation of reportable segment net income to consolidated net income below.

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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. Also included are the engineering expenses that are incurred while working on new product design, capacity, optimization programs, etc for products that are not currently being produced. + References No definition available. + Details
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