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Reportable Segments (Reconciliation of Reportable Segment Net Income to Consolidated Net Income) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Segment Reporting, Revenue Reconciling Item [Line Items]    
Research, development, and engineering expense $ (249) $ (241)
Equity in earnings of affiliated companies 25 39
Amortization of intangibles (29) (19)
Interest expense, net (52) (52)
Income tax benefit (provision) (76) (124)
Net income (loss) attributable to Corning Incorporated 499 (589)
Operating Segments [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Research, development, and engineering expense [1] (213) (202)
Income tax benefit (provision) [2] (111) (92)
Net income (loss) attributable to Corning Incorporated [3] 413 345
Operating Segments [Member] | Reportable Segments [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Net income (loss) attributable to Corning Incorporated 485 419
Operating Segments [Member] | Non Reportable Segments [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Net income (loss) attributable to Corning Incorporated (72) (74)
Segment Reconciling Items [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Impact of foreign currency movements (37) (31)
Gain (loss) on foreign currency hedges related to translated earnings 184 (622)
Litigation, regulatory and other legal matters   (136)
Research, development, and engineering expense (36) (39)
Equity in earnings of affiliated companies [4] 26 (37)
Amortization of intangibles (29) (19)
Interest expense, net (45) (39)
Income tax benefit (provision) 35 (32)
Other corporate items (12) 21
Net income (loss) attributable to Corning Incorporated $ 499 $ (589)
[1] Research, development and engineering expenses include direct project spending that is identifiable to a segment.
[2] Income tax provision (benefit) reflects a tax rate of 21%.
[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.
[4] Primarily represents the equity earnings of HSG.