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Reportable Segments (Tables)
 9 Months Ended
Sep. 30, 2012
Reportable Segments [Abstract]  
Schedule Of Reportable Segments Information By Segment

 
Display
Technologies
  
Telecom-
munications
  
Environmental
Technologies
  
Specialty
Materials
  
Life
Sciences
  
All
Other
  
Total
Three months ended September 30, 2012
                                        
   Net sales
$
763 
  
$
523 
  
$
233 
  
$
363 
  
$
155 
  
$
1 
  
$
2,038 
   Depreciation (1)
$
123 
  
$
34 
  
$
30 
  
$
40 
  
$
11 
  
$
5 
  
$
243 
   Amortization of purchased intangibles
      
$
2 
              
$
2 
        
$
4 
   Research, development and engineering expenses (2)
$
24 
  
$
35 
  
$
23 
  
$
28 
  
$
5 
  
$
36 
  
$
151 
   Equity in earnings of affiliated companies
$
187 
  
$
1 
                    
$
1 
  
$
189 
   Income tax (provision) benefit
$
(83)
  
$
(17)
  
$
(13)
  
$
(29)
  
$
(4)
  
$
15 
  
$
(131)
   Net income (loss) (3)
$
440 
  
$
35 
  
$
26 
  
$
59 
  
$
9 
  
$
(30)
  
$
539 
                                         
Three months ended September 30, 2011
                                        
   Net sales
$
815 
  
$
560 
  
$
247 
  
$
299 
  
$
153 
  
$
1 
  
$
2,075 
   Depreciation (1)
$
131 
  
$
31 
  
$
27 
  
$
41 
  
$
8 
  
$
3 
  
$
241 
   Amortization of purchased intangibles
      
$
2 
              
$
1 
        
$
3 
   Research, development and engineering expenses (2)
$
21 
  
$
29 
  
$
27 
  
$
35 
  
$
3 
  
$
22 
  
$
137 
   Equity in earnings of affiliated companies
$
222 
  
$
    
$
    
$
5 
        
$
4 
  
$
231 
   Income tax (provision) benefit
$
(118)
  
$
(30)
  
$
(15)
  
$
(16)
  
$
(10)
  
$
9 
  
$
(180)
   Net income (loss) (3)
$
593 
  
$
82 
  
$
32 
  
$
38 
  
$
21 
  
$
(17)
  
$
749 
                                         
Nine months ended September 30, 2012
                                        
   Net sales
$
2,109 
  
$
1,590 
  
$
745 
  
$
947 
  
$
472 
  
$
3 
  
$
5,866 
   Depreciation (1)
$
377 
  
$
98 
  
$
87 
  
$
110 
  
$
31 
  
$
11 
  
$
714 
   Amortization of purchased intangibles
      
$
7 
              
$
6 
        
$
13 
   Research, development and engineering expenses (2)
$
77 
  
$
105 
  
$
75 
  
$
102 
  
$
16 
  
$
92 
  
$
467 
   Equity in earnings (loss) of affiliated companies
$
553 
  
$
(1)
  
$
1 
              
$
14 
  
$
567 
   Income tax (provision) benefit
$
(257)
  
$
(46)
  
$
(50)
  
$
(57)
  
$
(15)
  
$
37 
  
$
(388)
   Net income (loss) (3)
$
1,232 
  
$
92 
  
$
100 
  
$
114 
  
$
32 
  
$
(66)
  
$
1,504 
                                         
Nine months ended September 30, 2011
                                        
   Net sales
$
2,365 
  
$
1,582 
  
$
764 
  
$
836 
  
$
452 
  
$
4 
  
$
6,003 
   Depreciation (1)
$
378 
  
$
91 
  
$
79 
  
$
120 
  
$
25 
  
$
8 
  
$
701 
   Amortization of purchased intangibles
      
$
5 
              
$
5 
        
$
10 
   Research, development and engineering expenses (2)
$
73 
  
$
90 
  
$
73 
  
$
100 
  
$
12 
  
$
68 
  
$
416 
   Equity in earnings of affiliated companies
$
835 
  
$
4 
  
$
1 
  
$
13 
        
$
13 
  
$
866 
   Income tax (provision) benefit
$
(375)
  
$
(71)
  
$
(44)
  
$
(28)
  
$
(24)
  
$
28 
  
$
(514)
   Net income (loss) (3)
$
1,857
  
$
169 
  
$
93 
  
$
69 
  
$
51 
  
$
(52)
  
$
2,187 

(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.  In the three and nine months ended September 30, 2011,  the Telecommunications segment included a credit of $22 million from the reduction to a contingent liability associated with an acquisition recorded in the first quarter of 2011.
Reconciliation Of Reportable Segment Net Income To Consolidated Net Income
Three months ended
September 30,
  
Nine months ended
September 30,
 
2012
  
2011
  
2012
  
2011
Net income of reportable segments
$
569 
  
$
766 
  
$
1,570 
  
$
2,239 
Non-reportable segments
  
(30)
    
(17)
    
(66)
    
(52)
Unallocated amounts:
                      
Net financing costs (1)
  
(55)
    
(47)
    
(139)
    
(146)
Stock-based compensation expense
  
(16)
    
(21)
    
(56)
    
(66)
Exploratory research
  
(27)
    
(23)
    
(74)
    
(59)
Corporate contributions
  
(13)
    
(6)
    
(36)
    
(38)
Equity in earnings of affiliated companies, net of impairments (2)
  
51 
    
93 
    
150 
    
284 
Asbestos settlement (3)
  
(3)
    
(5)
    
(9)
    
(15)
Other corporate items (4)
  
45 
    
71 
    
105 
    
167 
Net income
$
521 
  
$
811 
  
$
1,445 
  
$
2,314 

(1)
Net financing costs include interest income, interest expense, and interest costs and investment gains associated with benefit plans.
(2)
Primarily represents the equity earnings of Dow Corning Corporation.  In the three and nine months ended September 30, 2012, Corning recorded a $10 million credit for our share of Dow Corning Corporation's settlement of a dispute related to long term supply agreements.
(3)
In the three and nine months ended September 30, 2012, Corning recorded a charge of $3 million and $9 million, respectively, to adjust the asbestos liability for the change in value of the components of the Amended PCC Plan. In the three and nine months ended September 30, 2011, Corning recorded a charge of $5 million and $15 million, respectively, to adjust the asbestos liability for the change in value of the components of the Amended PCC Plan.
(4)
In the three months ended September 30, 2011, Corning recorded a $41 million tax benefit from the filing of an amended 2006 U.S. Federal Tax return to claim foreign tax credits.