Registration of securities issued in business combination transactions

INTANGIBLE ASSETS

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INTANGIBLE ASSETS
 12 Months Ended
Dec. 31, 2013
INTANGIBLE ASSETS  
INTANGIBLE ASSETS

8. INTANGIBLE ASSETS

        The gross carrying amount and accumulated amortization of intangible assets were as follows (dollars in millions):

 
   December 31, 2013   December 31, 2012  
 
   Carrying
Amount		   Accumulated
Amortization		   Net   Carrying
Amount		   Accumulated
Amortization		   Net  

Patents, trademarks and technology

   $ 384   $ 339   $ 45   $ 355   $ 318   $ 37  

Licenses and other agreements

     52     19     33     41     16     25  

Non-compete agreements

     4     2     2     2     2     —  

Other intangibles

     70     62     8     68     60     8  
                           
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 510   $ 422   $ 88   $ 466   $ 396   $ 70  
                           
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                           

        Amortization expense was $21 million, $23 million and $30 million for the years ended December 31, 2013, 2012 and 2011, respectively.

        Our estimated future amortization expense for intangible assets over the next five years is as follows (dollars in millions):

Year ending December 31,
   
  

2014

   $ 15  

2015

     8  

2016

     8  

2017

     7  

2018

     6