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Goodwill and other intangible assets
9 Months Ended
Sep. 30, 2013
Goodwill and other intangible assets

Note 11. Goodwill and other intangible assets

A reconciliation of the change in the carrying value of goodwill is as follows (in millions).

 

     September 30,
2013
    December 31,
2012
 

Balance at beginning of year

   $ 54,523      $ 53,213   

Acquisitions of businesses

     322        1,442   

Other, including foreign currency translation

     (110     (132
  

 

 

   

 

 

 

Balance at end of period

   $ 54,735      $ 54,523   
  

 

 

   

 

 

 

Intangible assets other than goodwill are included in other assets in our Consolidated Balance Sheets and are summarized by type as follows (in millions).

 

     September 30, 2013      December 31, 2012  
     Gross carrying
amount
     Accumulated
amortization
     Gross carrying
amount
     Accumulated
amortization
 

Insurance and other

   $ 12,013       $ 3,525       $ 11,737       $ 2,994   

Railroad, utilities and energy

     2,198         1,147         2,163         913   
  

 

 

    

 

 

    

 

 

    

 

 

 
   $ 14,211       $ 4,672       $ 13,900       $ 3,907   
  

 

 

    

 

 

    

 

 

    

 

 

 

Trademarks and trade names

   $ 2,865       $ 326       $ 2,819       $ 278   

Patents and technology

     5,162         2,470         5,014         2,059   

Customer relationships

     4,660         1,421         4,565         1,155   

Other

     1,524         455         1,502         415   
  

 

 

    

 

 

    

 

 

    

 

 

 
   $ 14,211       $ 4,672       $ 13,900       $ 3,907   
  

 

 

    

 

 

    

 

 

    

 

 

 

Amortization expense was $797 million for the first nine months of 2013 and $760 million for the first nine months of 2012. Intangible assets with indefinite lives as of September 30, 2013 and December 31, 2012 were $2,344 million and $2,328 million, respectively.