Stockholders' equity - Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Product sales	$ 7,447	$ 6,105
Other (expense) income, net	(235)	2,064
(Loss) income before income taxes	(68)	3,442
Provision for income taxes	(45)	(601)
Net (loss) income	(113)	2,841
Product sales
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Product sales	7,118	5,846
Reclassification out of Accumulated Other Comprehensive Income | Cash flow hedges
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
(Loss) income before income taxes	20	30
Provision for income taxes	(4)	(6)
Net (loss) income	16	24
Reclassification out of Accumulated Other Comprehensive Income | Foreign currency contract gains | Cash flow hedges | Product sales
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Product sales	51	52
Reclassification out of Accumulated Other Comprehensive Income | Cross-currency swap contract losses | Cash flow hedges
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other (expense) income, net	(31)	(22)
Reclassification out of Accumulated Other Comprehensive Income | Cash flow hedges | Foreign currency contract gains | Cash flow hedges | Product sales
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Product sales	51	52
Reclassification out of Accumulated Other Comprehensive Income | Cash flow hedges | Cross-currency swap contract losses | Cash flow hedges
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other (expense) income, net	$ (31)	$ (22)