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Acquired Intangible Assets (Notes)
6 Months Ended
Jun. 30, 2014
Acquired Intangible Assets Disclosure [Abstract]  
Acquired Intangible Assets
Acquired Intangible Assets

Identifiable acquisition-related intangible assets as of June 30, 2014 and December 31, 2013 were as follows (dollars in millions):

 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
June 30, 2014
 
 
 
 
 
Finite-Lived Intangible Assets:
 
 
 
 
 
Customer Contracts and Relationships
$
786

 
$
(700
)
 
$
86

Trademarks
55

 
(38
)
 
17

Patents and Developed Technology
158

 
(124
)
 
34

 
999

 
(862
)
 
137

Indefinite-Lived Intangible Assets:
 
 
 
 
 
Vyvx Trade Name
32

 

 
32

 
$
1,031

 
$
(862
)
 
$
169

December 31, 2013
 
 
 
 
 
Finite-Lived Intangible Assets:
 
 
 
 
 
Customer Contracts and Relationships
$
786

 
$
(678
)
 
$
108

Trademarks
55

 
(31
)
 
24

Patents and Developed Technology
158

 
(117
)
 
41

 
999

 
(826
)
 
173

Indefinite-Lived Intangible Assets:
 
 
 
 
 
Vyvx Trade Name
32

 

 
32

 
$
1,031

 
$
(826
)
 
$
205



Acquired finite-lived intangible asset amortization expense was $17 million and $36 million for the three and six months ended June 30, 2014 and $18 million and $36 million for the three and six months ended June 30, 2013.

At June 30, 2014, the weighted average remaining useful lives of the Company's acquired finite-lived intangible assets was 1.8 years for customer contracts and relationships, 1.3 years for trademarks and 2.5 years for patents and developed technology.

As of June 30, 2014, 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):

2014 (remaining 6 months)
$
27

2015
48

2016
31

2017
15

2018
13

2019
3

Thereafter

 
$
137