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Goodwill and other intangible assets
12 Months Ended
Dec. 31, 2014
Goodwill and other intangible assets
(11) Goodwill and other intangible assets

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

 

     December 31,  
     2014      2013  

Balance at beginning of year

   $ 57,011      $ 54,523  

Acquisitions of businesses

     4,006        2,732  

Other, including foreign currency translation

     (303 )      (244 )
  

 

 

    

 

 

 

Balance at end of year

$ 60,714   $ 57,011  
  

 

 

    

 

 

 

 

Intangible assets other than goodwill are included in other assets and are summarized as follows (in millions).

 

     December 31, 2014      December 31, 2013  
     Gross carrying
amount
     Accumulated
amortization
     Gross carrying
amount
     Accumulated
amortization
 

Insurance and other

   $ 13,714      $ 4,476      $ 11,923      $ 3,723  

Railroad, utilities and energy

     2,254        1,551        2,214        1,231  
  

 

 

    

 

 

    

 

 

    

 

 

 
$ 15,968   $ 6,027   $ 14,137   $ 4,954  
  

 

 

    

 

 

    

 

 

    

 

 

 

Trademarks and trade names

$ 3,117   $ 599   $ 2,750   $ 340  

Patents and technology

  5,425     3,133     5,173     2,626  

Customer relationships

  5,603     1,768     4,690     1,518  

Other

  1,823     527     1,524     470  
  

 

 

    

 

 

    

 

 

    

 

 

 
$ 15,968   $ 6,027   $ 14,137   $ 4,954  
  

 

 

    

 

 

    

 

 

    

 

 

 

Amortization expense was $1,155 million in 2014, $1,090 million in 2013 and $1,008 million in 2012. Estimated amortization expense over the next five years is as follows (in millions): 2015 – $927; 2016 – $870; 2017 – $856, 2018 – $759 and 2019 – $684. Intangible assets with indefinite lives as of December 31, 2014 and 2013 were $2,586 million and $2,221 million, respectively.