Goodwill and other intangible assets - Schedule of Other Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Finite-lived intangible assets:
Gross carrying amounts	$ 55,062	$ 55,229
Accumulated amortization	(28,423)	(23,806)
Other intangible assets, net	26,639	31,423
Indefinite-lived intangible assets:
Identifiable intangible assets	56,122	56,447
Accumulated amortization	(28,423)	(23,806)
Identifiable intangible assets, net	27,699	32,641
In-process research and development
Indefinite-lived intangible assets:
Indefinite-lived intangible assets	1,060	1,218
Developed-product-technology rights
Finite-lived intangible assets:
Gross carrying amounts	48,611	48,631
Accumulated amortization	(22,594)	(18,049)
Other intangible assets, net	26,017	30,582
Licensing rights
Finite-lived intangible assets:
Gross carrying amounts	3,875	3,865
Accumulated amortization	(3,392)	(3,265)
Other intangible assets, net	483	600
Marketing-related rights
Finite-lived intangible assets:
Gross carrying amounts	1,202	1,339
Accumulated amortization	(1,202)	(1,264)
Other intangible assets, net	0	75
R&D technology rights
Finite-lived intangible assets:
Gross carrying amounts	1,374	1,394
Accumulated amortization	(1,235)	(1,228)
Other intangible assets, net	$ 139	$ 166