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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.