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Goodwill and other intangible assets
6 Months Ended
Jun. 30, 2012
Goodwill and other intangible assets
Note 10.    Goodwill and other intangible assets
 
A reconciliation of the change in the carrying value of goodwill for the six months ended June 30, 2012 and the year ended December 31, 2011 follows (in millions).
 
    June 30,     December 31,  
   
2012
   
2011
 
Balance at beginning of year
  $ 53,213     $ 49,006  
Acquisitions of businesses
    115       4,179  
Other, including foreign currency translation
    (183 )     28  
Balance at end of period
  $ 53,145     $ 53,213  
 
Intangible assets other than goodwill are included in other assets and are summarized by type as follows (in millions).
 
   
June 30, 2012
   
December 31, 2011
 
   
Gross carrying
amount
   
Accumulated
amortization
   
Gross carrying
amount
   
Accumulated
amortization
 
Insurance and other
  $ 11,124     $ 2,639     $ 11,016     $ 2,319  
Railroad, utilities and energy
    2,097       783       2,088       623  
    $ 13,221     $ 3,422     $ 13,104     $ 2,942  
                                 
Trademarks and trade names
  $ 2,672     $ 250     $ 2,655     $ 219  
Patents and technology
    4,943       1,777       4,900       1,496  
Customer relationships
    4,124       991       4,060       840  
Other
    1,482       404       1,489       387  
    $ 13,221     $ 3,422     $ 13,104     $ 2,942  
 
Amortization expense was $502 million for the first six months of 2012 and $374 million for the first six months of 2011. Intangible assets with indefinite lives as of June 30, 2012 and December 31, 2011 were $2,274 million and $2,250 million, respectively.