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Goodwill and acquisition-related intangibles
9 Months Ended
Sep. 30, 2012
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and acquisition-related intangibles
Goodwill and acquisition-related intangibles
Goodwill was $4.452 billion as of September 30, 2012, and December 31, 2011. There was no impairment of goodwill during the nine months ended September 30, 2012. The following table shows the components of acquisition-related intangible assets as of September 30, 2012, and December 31, 2011:

 
 
 
 
September 30, 2012
 
December 31, 2011
Acquisition-related Intangibles
 
Amortization Period (Years)
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net
Developed technology
 
4 - 10
 
$
2,141

 
$
262

 
$
1,879

 
$
2,089

 
$
91

 
$
1,998

Customer relationships
 
5 - 8
 
822

 
112

 
710

 
822

 
34

 
788

Other intangibles
 
2 - 7
 
50

 
37

 
13

 
50

 
29

 
21

In-process R&D
 
(a)
 
41

 

 
41

 
93

 

 
93

Total
 
 
 
$
3,054

 
$
411

 
$
2,643

 
$
3,054

 
$
154

 
$
2,900

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

Amortization of acquisition-related intangibles was $86 million and $257 million for the three- and nine-month periods ended September 30, 2012, respectively, and $12 million and $26 million for the three- and nine-month periods ended September 30, 2011, respectively. Amortization expenses related to the National acquisition were $81 million and $244 million for the three- and nine-month periods ended September 30, 2012, respectively, and $6 million for both the three- and nine-month periods ended September 30, 2011.