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Goodwill and acquisition-related intangibles
9 Months Ended
Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and acquisition-related intangibles
Goodwill and acquisition-related intangibles

Goodwill was $4.36 billion net of accumulated impairment of $90 million as of September 30, 2014, and December 31, 2013. There was no impairment of goodwill during the nine months ended September 30, 2014 and 2013.

Components of acquisition-related intangible assets are as follows:

 
 
 
 
September 30, 2014
 
December 31, 2013
Acquisition-related Intangibles
 
Amortization Period (Years)
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net
Developed technology
 
5 - 10
 
$
2,128

 
$
659

 
$
1,469

 
$
2,157

 
$
526

 
$
1,631

Customer relationships
 
8
 
810

 
305

 
505

 
821

 
239

 
582

Other intangibles
 
5
 
3

 
2

 
1

 
5

 
3

 
2

In-process R&D
 
(a)
 
7

 
n/a

 
7

 
8

 
n/a

 
8

Total
 
 
 
$
2,948

 
$
966

 
$
1,982

 
$
2,991

 
$
768

 
$
2,223


(a) In-process R&D is not amortized until the associated project has been completed. Alternatively, if the associated project is determined not to be viable, it is expensed.

Amortization of acquisition-related intangibles was $80 million and $83 million for the three months ended and $241 million and $253 million for the nine months ended September 30, 2014, and 2013, respectively, primarily related to developed technology. Fully amortized assets are written off against accumulated amortization.