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Goodwill and other intangible assets
9 Months Ended
Sep. 30, 2014
Goodwill and other intangible assets

Note 12. Goodwill and other intangible assets

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

September 30,
2014
December 31,
2013

Balance at beginning of year

$ 57,011 $ 54,523

Acquisitions of businesses

1,818 2,732

Other, including foreign currency translation

(160 ) (244 )

Balance at end of period

$ 58,669 $ 57,011

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

September 30, 2014 December 31, 2013
Gross carrying
amount
Accumulated
amortization
Gross carrying
amount
Accumulated
amortization

Insurance and other

$ 13,251 $ 4,194 $ 11,923 $ 3,723

Railroad, utilities and energy

2,253 1,469 2,214 1,231

$ 15,504 $ 5,663 $ 14,137 $ 4,954

Trademarks and trade names

$ 3,058 $ 419 $ 2,750 $ 340

Patents and technology

5,412 3,053 5,173 2,626

Customer relationships

5,241 1,680 4,690 1,518

Other

1,793 511 1,524 470

$ 15,504 $ 5,663 $ 14,137 $ 4,954

Amortization expense was $854 million for the first nine months of 2014 and $797 million for the first nine months of 2013. Intangible assets with indefinite lives as of September 30, 2014 and December 31, 2013 were $2,604 million and $2,221 million, respectively.