Goodwill and other intangible assets (Tables)

3 Months Ended

Mar. 31, 2025

Goodwill and Intangible Assets Disclosure [Abstract]

Reconciliation of the change in goodwill

Reconciliations of the changes in the carrying value of goodwill for the first quarter of 2025 and for the year ended December 31, 2024 follow (in millions).

	March 31, 2025		December 31, 2024
Balance at the beginning of the year*	$	83,880	$	84,626
Business acquisitions		58		87
Other, including foreign currency translation		69		(833	)
Balance at the end of the period*	$	84,007	$	83,880

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* Net of accumulated goodwill impairments of $11.5 billion as of March 31, 2025 and December 31, 2024 and $11.1 billion as of December 31, 2023.

Schedule of intangible assets

Other intangible assets are summarized below (in millions).

	March 31, 2025						December 31, 2024
	Gross carrying amount		Accumulated amortization		Net carrying value		Gross carrying amount		Accumulated amortization		Net carrying value
Insurance and other:
Customer relationships	$	30,896	$	8,990	$	21,906	$	30,941	$	8,840	$	22,101
Trademarks and trade names		9,017		1,075		7,942		9,007		1,041		7,966
Patents and technology		5,433		4,450		983		5,375		4,359		1,016
Other		5,571		2,071		3,500		5,551		1,996		3,555
	$	50,917	$	16,586	$	34,331	$	50,874	$	16,236	$	34,638
Railroad, utilities and energy:
Customer relationships and contracts	$	1,541	$	738	$	803	$	1,553	$	728	$	825
Other		436		129		307		437		126		311
	$	1,977	$	867	$	1,110	$	1,990	$	854	$	1,136