Reportable Segments (Tables)

3 Months Ended

Mar. 31, 2018

Reportable Segments [Abstract]

Reportable Segments

	Display		Optical		Specialty		Environmental		Life		All
	Technologies		Communications		Materials		Technologies		Sciences		Other		Total
Three months ended
March 31, 2018
Reportable segment net sales	$	745	$	886	$	278	$	322	$	232	$	50	$	2,513
Depreciation (1)	$	144	$	52	$	33	$	29	$	14	$	11	$	283
Research, development and    engineering expenses (2)	$	23	$	49	$	39	$	29	$	5	$	57	$	202
Income tax (provision)    benefit	$	(49)	$	(30)	$	(12)	$	(14)	$	(7)	$	20	$	(92)
Segment net income (loss) (3)	$	185	$	109	$	46	$	52	$	27	$	(74)	$	345

	Display		Optical		Specialty		Environmental		Life		All
	Technologies		Communications		Materials		Technologies		Sciences		Other		Total
Three months ended
March 31, 2017
Reportable segment net sales	$	782	$	818	$	300	$	275	$	210	$	36	$	2,421
Depreciation (1)	$	129	$	45	$	29	$	31	$	12	$	12	$	258
Research, development and    engineering expenses (2)	$	19	$	37	$	36	$	25	$	6	$	52	$	175
Income tax (provision)    benefit	$	(65)	$	(30)	$	(15)	$	(12)	$	(6)	$	15	$	(113)
Segment net income (loss) (3)	$	245	$	110	$	57	$	44	$	24	$	(60)	$	420

(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) 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 (loss) income below.

A reconciliation of reportable segment and All Other net sales to consolidated net sales follows (in millions):

	Three months ended
	March 31,
	2018		2017
Net sales of reportable segments and All Other	$	2,513	$	2,421
Impact of foreign currency movements not          included in segment net sales (1)		(13)		(46)
Net sales	$	2,500	$	2,375

(1)This amount primarily represents the impact of foreign currency adjustments in the Display Technologies segment.

Reconciliation of Reportable Segment and All Other Net Sales to Consolidated Net Sales)

	Three months ended
	March 31,
	2018		2017
Net sales of reportable segments and All Other	$	2,513	$	2,421
Impact of foreign currency movements not          included in segment net sales (1)		(13)		(46)
Net sales	$	2,500	$	2,375

(1)This amount primarily represents the impact of foreign currency adjustments in the Display Technologies segment.

Reconciliation of Reportable Segment Net Income to Consolidated Net Income

	Three months ended
	March 31,
	2018		2017
Net income of reportable segments	$	419	$	480
Net loss of All Other		(74)		(60)
Unallocated amounts:
Impact of foreign currency movements not       included in segment net income (loss)		(31)		(37)
Unrealized loss on foreign currency hedges       related to translated earnings		(622)		(438)
Litigation expense		(136)		(3)
Research, development, and engineering expense		(39)		(27)
Equity in earnings of affiliated companies (1)		(37)		(79)
Income tax (provision) benefit		(32)		179
Other corporate items		(37)		71
Net (loss) income	$	(589)	$	86

(1) Primarily represents the equity earnings of HSG.