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Reportable Segments (Reportable Segments) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Net sales $ 3,035 $ 3,008 $ 2,747 $ 2,500 $ 2,637 $ 2,607 $ 2,497 $ 2,375 $ 11,290 $ 10,116 $ 9,390
Depreciation                 1,199 1,083 1,131
Research, development and engineering expenses                 993 864 736
Income tax (provision) benefit (54) (133) (126) (124) (1,978) [1] (89) [1] (153) [1] 66 [1] (437) (2,154) [1] 3
Net income (loss) 292 $ 625 $ 738 $ (589) (1,412) $ 390 $ 439 $ 86 1,066 (497) 3,695
Operating Segments [Member]                      
Net sales [2]                 11,398 10,258 9,440
Depreciation [3]                 1,146 1,077 1,119
Research, development and engineering expenses [4]                 850 760 635
Income tax (provision) benefit                 (477) (442) (421)
Net income (loss) [5]                 1,784 1,659 1,561
Investment in affiliated companies, at equity 312       279       312 279 324
Segment assets [6] 17,248       16,180       17,248 16,180 14,167
Capital expenditures                 2,071 1,878 1,021
Display Technologies [Member] | Operating Segments [Member]                      
Net sales                 3,276 3,137 3,288
Depreciation [3]                 585 534 598
Research, development and engineering expenses [4]                 106 88 45
Income tax (provision) benefit                 (221) (234) (253)
Net income (loss) [5]                 835 888 953
Investment in affiliated companies, at equity 131       134       131 134 41
Segment assets [6] 8,794       8,662       8,794 8,662 8,032
Capital expenditures                 755 795 464
Optical Communications [Member] | Operating Segments [Member]                      
Net sales                 4,192 3,545 3,005
Depreciation [3]                 218 193 175
Research, development and engineering expenses [4]                 212 174 147
Income tax (provision) benefit                 (163) (129) (96)
Net income (loss) [5]                 592 469 351
Investment in affiliated companies, at equity 3       2       3 2 (1)
Segment assets [6] 3,042       2,599       3,042 2,599 2,010
Capital expenditures                 417 505 245
Specialty Materials [Member] | Operating Segments [Member]                      
Net sales                 1,479 1,403 1,124
Depreciation [3]                 136 129 109
Research, development and engineering expenses [4]                 163 152 126
Income tax (provision) benefit                 (83) (79) (61)
Net income (loss) [5]                 313 301 228
Investment in affiliated companies, at equity 6       3       6 3  
Segment assets [6] 2,176       2,155       2,176 2,155 1,604
Capital expenditures                 242 223 120
Environmental Technologies [Member] | Operating Segments [Member]                      
Net sales                 1,289 1,106 1,032
Depreciation [3]                 119 124 129
Research, development and engineering expenses [4]                 118 113 102
Income tax (provision) benefit                 (55) (44) (42)
Net income (loss) [5]                 208 165 159
Investment in affiliated companies, at equity                     32
Segment assets [6] 1,633       1,402       1,633 1,402 1,267
Capital expenditures                 273 157 97
Life Sciences [Member] | Operating Segments [Member]                      
Net sales                 946 879 839
Depreciation [3]                 50 52 58
Research, development and engineering expenses [4]                 20 22 24
Income tax (provision) benefit                 (31) (25) (24)
Net income (loss) [5]                 117 95 90
Investment in affiliated companies, at equity 1               1    
Segment assets [6] 585       538       585 538 504
Capital expenditures                 55 42 39
All Other [Member]                      
Net sales                 216 188 152
Depreciation [3]                 38 45 50
Research, development and engineering expenses [4]                 231 211 191
Income tax (provision) benefit                 76 69 55
Net income (loss) [5]                 (281) (259) (220)
Investment in affiliated companies, at equity 171       140       171 140 252
Segment assets [6] $ 1,018       $ 824       1,018 824 750
Capital expenditures                 329 156 56
All Other [Member] | Operating Segments [Member]                      
Net sales                 $ 216 $ 188 $ 152
[1] In December 2017, the U.S. enacted the 2017 Tax Act which resulted in significant changes to our provision for income taxes during the fourth quarter of 2017. Refer to Note 4 (Income Taxes) to the Consolidated Financial Statements for additional information.
[2] Net sales are attributed to countries based on location of customer.
[3] Depreciation expense for Corning's reportable segments includes an allocation of depreciation of corporate property not specifically identifiable to a segment.
[4] Research, development and engineering expenses include direct project spending that is identifiable to a segment.
[5] 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.
[6] Segment assets include inventory, accounts receivable, property, plant and equipment, net of accumulated depreciation, and associated equity companies and cost investments.