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

 
 
 
 
March 31, 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
 
$
2,115

 
$
148

 
$
1,967

 
$
2,089

 
$
91

 
$
1,998

Customer relationships
 
5 - 8
 
822

 
60

 
762

 
822

 
34

 
788

Other intangibles
 
2 - 10
 
50

 
31

 
19

 
50

 
29

 
21

In-process R&D
 
(a)
 
67

 

 
67

 
93

 

 
93

Total
 
 
 
$
3,054

 
$
239

 
$
2,815

 
$
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 for the three months ended March 31, 2012, and included $81 million of amortization expense related to the intangible assets acquired through the National acquisition.