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Reportable Segments (Reportable Segments) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Segment net sales |  | $ 2,812 | $ 2,500
Depreciation |  | 306 | 304
Research, development and engineering expenses |  | 249 | 241
Income tax benefit (provision) |  | (76) | (124)
Net income (loss) attributable to Corning Incorporated |  | $ 499 | $ (589)
Statutory U.S. income tax rate |  | 21.00% | 21.00%
Operating Segments [Member] |  |  |
Segment net sales |  | $ 2,850 | $ 2,513
Depreciation | [1] | 303 | 283
Research, development and engineering expenses | [2] | 213 | 202
Income tax benefit (provision) | [3] | (111) | (92)
Net income (loss) attributable to Corning Incorporated | [4] | 413 | 345
Display Technologies [Member] | Operating Segments [Member] |  |  |
Segment net sales |  | 818 | 745
Depreciation | [1] | 152 | 144
Research, development and engineering expenses | [2] | 26 | 23
Income tax benefit (provision) | [3] | (55) | (49)
Net income (loss) attributable to Corning Incorporated | [4] | 208 | 185
Optical Communications [Member] | Operating Segments [Member] |  |  |
Segment net sales |  | 1,064 | 886
Depreciation | [1] | 59 | 52
Research, development and engineering expenses | [2] | 56 | 49
Income tax benefit (provision) | [3] | (39) | (30)
Net income (loss) attributable to Corning Incorporated | [4] | 142 | 109
Specialty Materials [Member] | Operating Segments [Member] |  |  |
Segment net sales |  | 309 | 278
Depreciation | [1] | 37 | 33
Research, development and engineering expenses | [2] | 41 | 39
Income tax benefit (provision) | [3] | (13) | (12)
Net income (loss) attributable to Corning Incorporated | [4] | 49 | 46
Environmental Technologies [Member] | Operating Segments [Member] |  |  |
Segment net sales |  | 362 | 322
Depreciation | [1] | 31 | 29
Research, development and engineering expenses | [2] | 30 | 29
Income tax benefit (provision) | [3] | (15) | (14)
Net income (loss) attributable to Corning Incorporated | [4] | 55 | 52
Life Sciences [Member] | Operating Segments [Member] |  |  |
Segment net sales |  | 243 | 232
Depreciation | [1] | 13 | 14
Research, development and engineering expenses | [2] | 5 | 5
Income tax benefit (provision) | [3] | (8) | (7)
Net income (loss) attributable to Corning Incorporated | [4] | 31 | 27
All Other [Member] | Operating Segments [Member] |  |  |
Segment net sales |  | 54 | 50
Depreciation | [1] | 11 | 11
Research, development and engineering expenses | [2] | 55 | 57
Income tax benefit (provision) | [3] | 19 | 20
Net income (loss) attributable to Corning Incorporated | [4] | $ (72) | $ (74)
[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 to consolidated net income below.

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