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Acquisitions and divestitures - Aggregate Consideration Paid (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Business Acquisition [Line Items]
Goodwill	$ 15,509	$ 15,529
ChemoCentryx, Inc.
Business Acquisition [Line Items]
Cash and cash equivalents	86
Marketable securities	235
Inventories	41
Finite-lived intangible assets—developed-product-technology rights	3,499
Goodwill	649
Other liabilities, net	(83)
Deferred tax liability, net	(502)
Total assets acquired, net	$ 3,925

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