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Goodwill and other intangible assets
9 Months Ended
Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and other intangible assets

Note 13. Goodwill and other intangible assets

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

 

      September 30, 
2016
      December 31, 
2015
 

Balance at beginning of year

    $ 62,708          $ 60,714     

Acquisitions of businesses

     17,016           2,563     

Other, including foreign currency translation

     (332)           (569)    
  

 

 

    

 

 

 

Balance at end of period

    $ 79,392          $ 62,708     
  

 

 

    

 

 

 

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

 

    September 30, 2016       December 31, 2015
    Gross carrying
amount
 

         

  Accumulated
amortization
 

         

  Gross carrying
amount
 

         

  Accumulated
amortization

Insurance and other

         $ 41,575                    $ 6,541                    $ 14,610                    $ 5,462      

Railroad, utilities and energy

          897                     279                     888                     239      
       

 

 

                 

 

 

                 

 

 

                 

 

 

     
         $ 42,472                    $ 6,820                    $ 15,498                    $ 5,701      
       

 

 

                 

 

 

                 

 

 

                 

 

 

     

Trademarks and trade names

         $ 6,049                    $ 821                    $ 3,041                    $ 765      

Patents and technology

          4,455                     2,329                     4,252                     2,050      

Customer relationships

          28,851                     2,721                     5,474                     2,131      

Other

          3,117                     949                     2,731                     755      
       

 

 

                 

 

 

                 

 

 

                 

 

 

     
         $ 42,472                    $ 6,820                    $ 15,498                    $ 5,701      
       

 

 

                 

 

 

                 

 

 

                 

 

 

     

Other intangible assets at September 30, 2016 included preliminary fair values of intangible assets of PCC and Duracell of approximately $26.2 billion, which included approximately $17.6 billion in customer relationships and trade names that were preliminarily determined to have indefinite lives. Amortization expense in the first nine months of 2016 and 2015 was $1,085 million and $837 million, respectively. Intangible assets with indefinite lives, excluding intangible assets related to business acquisitions completed in 2016, were approximately $3.0 billion as of September 30, 2016 and December 31, 2015.