Registration of securities issued in business combination transactions

INTANGIBLE ASSETS

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INTANGIBLE ASSETS
12 Months Ended
Dec. 31, 2012
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, 2012   December 31, 2011  
 
  Carrying
Amount
  Accumulated
Amortization
  Net   Carrying
Amount
  Accumulated
Amortization
  Net  

Patents, trademarks and technology

  $ 355   $ 318   $ 37   $ 363   $ 307   $ 56  

Licenses and other agreements

    41     16     25     39     14     25  

Non-compete agreements

    2     2         2     2      

Other intangibles

    68     60     8     48     36     12  
                           

Total

  $ 466   $ 396   $ 70   $ 452   $ 359   $ 93  
                           

        Amortization expense was $23 million, $30 million and $30 million for the years ended December 31, 2012, 2011 and 2010, respectively.

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

Year ending December 31
   
 

2013

  $ 21  

2014

    13  

2015

    5  

2016

    5  

2017

    4