Reconciliations of the changes in the carrying value of goodwill for the first quarter of 2026 and for the year ended December 31, 2025 follow (in millions).


	March 31, 2026			December 31, 2025
Balance at the beginning of the year*	$	83,074		$	83,880
Business acquisitions		260			459
Other, including impairments and foreign currency translation		(154	)		(1,265	)
Balance at the end of the period*	$	83,180		$	83,074

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* Net of accumulated goodwill impairments of $13.0 billion as of March 31, 2026 and December 31, 2025 and $11.5 billion as of December 31, 2024.

Other intangible assets are summarized below (in millions).


	March 31, 2026						December 31, 2025
	Gross carrying amount		Accumulated amortization		Net carrying value		Gross carrying amount		Accumulated amortization		Net carrying value
Insurance and other:
Customer relationships	$	31,779	$	9,853	$	21,926	$	31,215	$	9,638	$	21,577
Trademarks and trade names		9,181		1,189		7,992		9,007		1,143		7,864
Patents and technology		5,306		4,219		1,087		5,237		4,196		1,041
Other		5,632		2,362		3,270		5,608		2,288		3,320
	$	51,898	$	17,623	$	34,275	$	51,067	$	17,265	$	33,802
Railroad, utilities and energy:*
Customer relationships and contracts	$	1,540	$	832	$	708	$	1,541	$	809	$	732
Other		441		137		304		442		134		308
	$	1,981	$	969	$	1,012	$	1,983	$	943	$	1,040

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* Included in other assets.

Intangible assets with indefinite lives were $19.0 billion as of March 31, 2026 and $18.9 billion as of December 31, 2025 and primarily related to certain customer relationships, trademarks and trade names. Intangible asset amortization expense in the first quarter was $446 million in 2026 and $444 million in 2025.