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Intangible Assets
3 Months Ended
Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
NOTE 8. Intangible Assets, net

Intangible assets, net at March 31, 2016 and December 31, 2015, are comprised of the following:
 
 
 
March 31, 2016
 
December 31, 2015
 
Estimated Weighted Average Useful Life (years)
 
Gross Carrying Value    
 
Accumulated Amortization
 
Net Carrying Value
 
Gross Carrying Value    
 
Accumulated Amortization
 
Net Carrying Value
 
 
 
(Dollars in Millions)
Definite-Lived:
 
 
Developed technology
7
 
$
39

 
$
21

 
$
18

 
$
39

 
$
20

 
$
19

Customer related
10
 
84

 
20

 
64

 
84

 
17

 
67

Other
32
 
8

 
1

 
7

 
8

 
1

 
7

Subtotal
 
 
131

 
42

 
89

 
131

 
38

 
93

Indefinite-Lived:
 
 
Goodwill
 
 
40

 

 
40

 
40

 

 
40

    Total
 
 
$
171

 
$
42

 
$
129

 
$
171

 
$
38

 
$
133



The Company recorded approximately $4 million of amortization expense related to definite-lived intangible assets for the three months ended March 31, 2016 and 2015. The Company currently estimates annual amortization expense to be $14 million for 2016 and $12 million each year from 2017 through 2020. Indefinite-lived intangible assets are not amortized but are tested for impairment at least annually, or earlier when events and circumstances indicate that it is more likely than not that such assets have been impaired.

A roll-forward of the carrying amounts of intangible assets is presented below:
 
Definite-lived intangibles
 
Indefinite-lived intangibles
 
 
 
Developed Technology
 
Customer Related
 
Other
 
Goodwill
 
Total
 
(Dollars in Millions)
 
 
 
 
 
 
 
 
 
 
December 31, 2015
$
19

 
$
67

 
$
7

 
$
40

 
$
133

Amortization
(1
)
 
(3
)
 

 

 
(4
)
March 31, 2016
$
18

 
$
64

 
$
7

 
$
40

 
$
129