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Acquired Intangible Assets
 12 Months Ended
Dec. 31, 2012
Acquired Intangible Assets Disclosure [Abstract]  
Acquired Intangible Assets
Acquired Intangible Assets

Identifiable acquisition-related intangible assets as of December 31, 2012 and December 31, 2011 were as follows (dollars in millions):

 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
December 31, 2012
 
 
 
 
 
Finite-Lived Intangible Assets:
 
 
 
 
 
Customer Contracts and Relationships
$
776

 
$
(633
)
 
$
143

Trademarks
55

 
(17
)
 
38

Patents and Developed Technology
158

 
(103
)
 
55

 
989

 
(753
)
 
236

Indefinite-Lived Intangible Assets:
 
 
 
 
 
Vyvx Trade Name
32

 
—

 
32

 
$
1,021

 
$
(753
)
 
$
268

December 31, 2011
 
 
 
 
 
Finite-Lived Intangible Assets:
 
 
 
 
 
Customer Contracts and Relationships
$
776

 
$
(571
)
 
$
205

Trademarks
55

 
(3
)
 
52

Patents and Developed Technology
158

 
(89
)
 
69

 
989

 
(663
)
 
326

Indefinite-Lived Intangible Assets:
 
 
 
 
 
Vyvx Trade Name
32

 
—

 
32

 
$
1,021

 
$
(663
)
 
$
358



During the fourth quarter of 2012, the Company conducted its long-lived assets and indefinite-lived intangible assets impairment analyses and concluded that there was no impairment.

During the fourth quarter of 2011, the Company conducted its long-lived asset impairment analysis and determined that the carrying value of certain wireless spectrum licenses acquired in a prior acquisition was impaired and recognized a $20 million charge in Other Expense.

During the third quarter of 2010, the Company determined that the useful life of certain customer relationships and developed technology should be reduced based on adverse economic conditions affecting customer attrition associated with these assets, which prospectively increased amortization expense by approximately $2 million during the year ended December 31, 2010.

Acquired finite-lived intangible asset amortization expense was $90 million in 2012, $99 million in 2011 and $95 million in 2010.
At December 31, 2012, the weighted average remaining useful lives of the Company's acquired finite-lived intangible assets was 2.9 years for customer contracts and relationships, 4.0 years for patents and developed technology and 2.8 years for trademarks.
As of December 31, 2012, estimated amortization expense for the Company’s finite-lived acquisition-related intangible assets over the next five years and thereafter is as follows (dollars in millions):

2013
$
73

2014
61

2015
45

2016
28

2017
13

Thereafter
16

 
$
236