Goodwill and other intangible assets - Schedule of Other Intangible Assets (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Finite-lived intangible assets:
Gross carrying amounts	$ 54,288	$ 55,062
Accumulated amortization	(29,624)	(28,423)
Other intangible assets, net	24,664	26,639
Indefinite-lived intangible assets:
Identifiable intangible assets	55,348	56,122
Accumulated amortization	(29,624)	(28,423)
Identifiable intangible assets, net	25,724	27,699
In-process research and development
Indefinite-lived intangible assets:
Indefinite-lived intangible assets	1,060	1,060
Developed-product-technology rights
Finite-lived intangible assets:
Gross carrying amounts	47,824	48,611
Accumulated amortization	(23,743)	(22,594)
Other intangible assets, net	24,081	26,017
Licensing rights
Finite-lived intangible assets:
Gross carrying amounts	3,875	3,875
Accumulated amortization	(3,425)	(3,392)
Other intangible assets, net	450	483
Marketing-related rights
Finite-lived intangible assets:
Gross carrying amounts	1,202	1,202
Accumulated amortization	(1,202)	(1,202)
Other intangible assets, net	0	0
Research and development technology rights
Finite-lived intangible assets:
Gross carrying amounts	1,387	1,374
Accumulated amortization	(1,254)	(1,235)
Other intangible assets, net	$ 133	$ 139