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Goodwill And Other Intangible Assets
9 Months Ended
Sep. 30, 2012
Goodwill And Other Intangible Assets [Abstract]  
Goodwill And Other Intangible Assets
10.      Goodwill and Other Intangible Assets

The carrying amount of goodwill by segment for the periods ended September 30, 2012 and December 31, 2011 is as follows (in millions):
 
Telecom-
munications
 
Display
Technologies
 
Specialty
Materials
 
Life
Sciences
 
Total
                   
Goodwill Balance
$209
 
$9
 
$150
 
$296
 
$664
 
Corning's gross goodwill balances for the periods ended September 30, 2012 and December 31, 2011 were $7.1 billion.  Accumulated impairment losses were $6.5 billion for the periods ended September 30, 2012 and December 31, 2011, and were generated entirely through goodwill impairments related to the Telecommunications segment recorded primarily in 2001.

Other intangible assets are as follows (in millions):
 
September 30, 2012
 
December 31, 2011
 
Gross
 
Accumulated
amortization
 
Net
 
Gross
 
Accumulated
amortization
 
Net
Amortized intangible assets:
                                 
Patents, trademarks, and trade names 
$
231
 
$
126
 
$
105
 
$
228
 
$
119
 
$
109
Customer lists and other 
 
165
   
22
   
143
   
169
   
16
   
153
                                   
Total
$
396
 
$
148
 
$
248
 
$
397
 
$
135
 
$
262

Amortized intangible assets are primarily related to the Telecommunications and Life Sciences segments.

Amortization expense related to these intangible assets is estimated to be $16 million for 2012 through 2015 and $15 million for 2016 and 2017.