Goodwill and other intangible assets (Tables)

3 Months Ended

Mar. 31, 2022

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 2022 and for the year ended December 31, 2021 follow (in millions).

	March 31, 2022			December 31, 2021
Balance at beginning of year	$	73,875		$	73,734
Business acquisitions		5			353
Other, including foreign currency translation		(58	)		(212	)
Balance at end of period*	$	73,822		$	73,875

* Net of accumulated goodwill impairments of $11.0 billion as of March 31, 2022 and December 31, 2021.

Schedule of intangible assets

The gross carrying amounts and related accumulated amortization of other intangible assets are summarized as follows (in millions).

	March 31, 2022						December 31, 2021
	Gross carrying amount		Accumulated amortization		Net carrying value		Gross carrying amount		Accumulated amortization		Net carrying value
Insurance and other:
Customer relationships	$	27,323	$	6,616	$	20,707	$	27,335	$	6,450	$	20,885
Trademarks and trade names		5,171		807		4,364		5,176		802		4,374
Patents and technology		4,818		3,547		1,271		4,763		3,484		1,279
Other		3,326		1,457		1,869		3,390		1,442		1,948
	$	40,638	$	12,427	$	28,211	$	40,664	$	12,178	$	28,486
Railroad, utilities and energy:
Customer relationships	$	678	$	404	$	274	$	678	$	396	$	282
Trademarks, trade names and other		1,015		157		858		1,015		146		869
	$	1,693	$	561	$	1,132	$	1,693	$	542	$	1,151