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Goodwill and other intangible assets
12 Months Ended
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
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,  
     2015     2014  

Balance at beginning of year

   $ 60,714      $ 57,011   

Acquisitions of businesses

     2,563        4,006   

Other, including foreign currency translation

     (569     (303
  

 

 

   

 

 

 

Balance at end of year

   $ 62,708      $ 60,714   
  

 

 

   

 

 

 

Other intangible assets are summarized as follows (in millions).

 

     December 31, 2015      December 31, 2014  
     Gross carrying
amount
     Accumulated
amortization
     Gross carrying
amount
     Accumulated
amortization
 

Insurance and other

   $ 14,610       $ 5,462       $ 13,667       $ 4,464   

Railroad, utilities and energy

     888         239         2,254         1,551   
  

 

 

    

 

 

    

 

 

    

 

 

 
   $ 15,498       $ 5,701       $ 15,921       $ 6,015   
  

 

 

    

 

 

    

 

 

    

 

 

 

Trademarks and trade names

   $ 3,041       $ 765       $ 3,105       $ 599   

Patents and technology

     4,252         2,050         5,425         3,133   

Customer relationships

     5,474         2,131         5,573         1,757   

Other

     2,731         755         1,818         526   
  

 

 

    

 

 

    

 

 

    

 

 

 
   $ 15,498       $ 5,701       $ 15,921       $ 6,015   
  

 

 

    

 

 

    

 

 

    

 

 

 

Amortization expense was $1,106 million in 2015, $1,155 million in 2014 and $1,090 million in 2013. Estimated amortization expense over the next five years is as follows (in millions): 2016 – $1,009; 2017 – $905; 2018 – $839, 2019 – $733 and 2020 – $628. Intangible assets with indefinite lives as of December 31, 2015 and 2014 were $2,964 million and $2,586 million, respectively.