Goodwill and other intangible assets (Identifiable Intangible Assets) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Gross carrying amounts	$ 32,098	$ 32,099
Accumulated amortization	(19,191)	(17,987)
Other intangible assets, net	12,907	14,112
Gross carrying amount	33,118	33,169
Accumulated amortization	(19,191)	(17,987)
Intangible assets, net	13,927	15,182
In-process Research and Development
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	1,020	1,070
Developed-Product-Technology Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amounts	25,537	25,561
Accumulated amortization	(13,863)	(12,769)
Other intangible assets, net	11,674	12,792
Licensing rights
Finite-Lived Intangible Assets [Line Items]
Gross carrying amounts	3,864	3,807
Accumulated amortization	(3,050)	(2,973)
Other intangible assets, net	814	834
Marketing-Related Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amounts	1,326	1,354
Accumulated amortization	(1,125)	(1,112)
Other intangible assets, net	201	242
Research and Development Technology Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amounts	1,371	1,377
Accumulated amortization	(1,153)	(1,133)
Other intangible assets, net	$ 218	$ 244