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Note 10 - Goodwill and Other Intangible Assets
3 Months Ended
Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Disclosure [Text Block]
10.      Goodwill and Other Intangible Assets

The carrying amount of goodwill by segment for the periods ended March 31, 2016 and December 31, 2015 is as follows (in millions):

 
Optical
Communications
 
Display
Technologies
 
Specialty
Materials
 
Life
Sciences
 
All
Other
Total
                                 
Balance at December 31, 2015
$
439
 
$
128
 
$
150
 
$
562
 
$
101
$
1,380
Foreign currency translation adjustment
 
6
   
2
         
8
   
3
 
19
Balance at March 31, 2016
$
445
 
$
130
 
$
150
 
$
570
 
$
104
$
1,399

Corning’s gross goodwill balances for the periods ended March 31, 2016 and December 31, 2015 each were $7.9 billion.  Accumulated impairment losses were $6.5 billion for the periods ended March 31, 2016 and December 31, 2015, and were generated primarily through goodwill impairments related to the Optical Communications segment.

Other intangible assets are as follows (in millions):

 
March 31, 2016
 
December 31, 2015
 
Gross
 
Accumulated
amortization
 
Net
 
Gross
 
Accumulated
amortization
 
Net
Amortized intangible assets:
                                 
Patents, trademarks, and trade names 
$
356
 
$
167
 
$
189
 
$
350
 
$
162
 
$
188
Customer lists and other 
 
629
   
115
   
514
   
621
   
103
   
518
Total
$
985
 
$
282
 
$
703
 
$
971
 
$
265
 
$
706

Corning’s amortized intangible assets are primarily related to the Optical Communications and Life Sciences segments.  The net carrying amount of intangible assets decreased during the first three months of 2016, primarily due to amortization of $14 million partially offset by foreign currency translation adjustments of $10 million and acquisitions of $1 million.

Amortization expense related to these intangible assets is estimated to be $61 million annually from 2016 to 2018, $60 million for 2019, and $55 million annually from 2020 to 2021.