Accumulated other comprehensive loss - Reclassification out of accumulated other comprehensive income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense (benefit)	$ 430	$ 379	$ 411	$ 365
Other nonoperating income, net	23	2	184	2
Total	1,297	1,199	1,413	1,171
Reclassifications from Accumulated other comprehensive loss to income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total	(6)	3	18	10
Reclassifications from Accumulated other comprehensive loss to income | Cash flow hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of product revenues	(9)	3	22	17
Income tax expense (benefit)	1	0	(3)	(4)
Total	(8)	3	19	13
Reclassifications from Accumulated other comprehensive loss to income | Pension and other postretirement plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense (benefit)	0	0	1	0
Other nonoperating income, net	2	0	(2)	(3)
Total	$ 2	$ 0	$ (1)	$ (3)