Goodwill and other intangible assets (Tables)

9 Months Ended

Sep. 30, 2023

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 nine months of 2023 and for the year ended December 31, 2022 follow (in millions).

	September 30, 2023			December 31, 2022
Balance at beginning of year	$	78,119		$	73,875
Business acquisitions		8,382			4,657
Other, including acquisition period remeasurements and foreign currency translation		(849	)		(413	)
Balance at end of period*	$	85,652		$	78,119

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* Net of accumulated goodwill impairments of $11.0 billion as of September 30, 2023 and December 31, 2022.

Schedule of intangible assets

Other intangible assets are summarized below (in millions).

	September 30, 2023						December 31, 2022
	Gross carrying amount		Accumulated amortization		Net carrying value		Gross carrying amount		Accumulated amortization		Net carrying value
Insurance and other:
Customer relationships	$	28,266	$	7,716	$	20,550	$	27,765	$	7,174	$	20,591
Trademarks and trade names		5,619		842		4,777		5,603		822		4,781
Patents and technology		5,083		3,984		1,099		4,943		3,748		1,195
Other		4,804		1,735		3,069		4,150		1,530		2,620
	$	43,772	$	14,277	$	29,495	$	42,461	$	13,274	$	29,187
Railroad, utilities and energy:
Customer relationships and contracts	$	5,276	$	753	$	4,523	$	1,507	$	541	$	966
Trademarks and trade names		2,228		57		2,171		217		39		178
Other		1,106		91		1,015		190		42		148
	$	8,610	$	901	$	7,709	$	1,914	$	622	$	1,292