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Acquisitions and divestitures - Aggregate Consideration Paid (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Business Acquisition [Line Items] |  |
Goodwill | $ 15,531 | $ 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 | 663 |
Other liabilities, net | (83) |
Deferred tax liability, net | (516) |
Total assets acquired, net | $ 3,925 |

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