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Reportable Segments (Reconciliation of Reportable Segment Net Income to Consolidated Net Income) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |
Research, development and engineering expenses |  | $ (244) | $ (215) | $ (728) | $ (623)
Equity in earnings of affiliated companies |  | 32 | 31 | 102 | 148
Amortization of intangibles |  | 27 | 18 | 68 | 53
Interest expense |  | (45) | (37) | (140) | (112)
Income tax (provision) benefit |  | (133) | (89) | (383) | (176)
Net income |  | 625 | 390 | 774 | 915
Operating Segments [Member] |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |
Research, development and engineering expenses | [1] | (213) | (190) | (627) | (550)
Income tax (provision) benefit |  | (139) | (114) | (341) | (340)
Net income | [2] | 520 | 430 | 1,278 | 1,272
Operating Segments [Member] | Reportable Segments [Member] |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |
Net income |  | 592 | 494 | 1,502 | 1,458
Operating Segments [Member] | Non Reportable Segments [Member] |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |
Net income |  | (72) | (64) | (224) | (186)
Segment Reconciling Items [Member] |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |
Impact of foreign currency movements not included in segment net income (loss) |  | (42) | (34) | (110) | (124)
Gain (loss) on foreign currency hedges related to translated earnings |  | 230 | 26 | 66 | (193)
Translation gain (loss) on Japanese yen-denominated debt |  | 30 | 14 | 28 | 14
Litigation, regulatory and other legal matters |  | (11) |  | (143) | 12
Research, development and engineering expenses |  | (31) | (25) | (99) | (72)
Equity in earnings of affiliated companies | [3] | 31 | 29 | 100 | 139
Amortization of intangibles |  | (27) | (18) | (68) | (53)
Interest expense |  | (38) | (27) | (111) | (79)
Income tax (provision) benefit |  | 6 | 25 | (42) | 164
Other corporate items |  | $ (43) | $ (30) | $ (125) | $ (165)
[1] | Research, development and engineering expenses include direct project spending that is identifiable to a segment.
[2] | 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.
[3] | Primarily represents the equity earnings of HSG.

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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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