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Acquisitions and divestitures - Schedule of Preliminary Amounts Recognized for Assets Acquired and Liabilities Assumed (Details) $ in Millions | Apr. 02, 2025 USD ($) intangibleAsset | Sep. 28, 2025 USD ($) | Dec. 29, 2024 USD ($)
--- | --- | --- | ---
Assets acquired: |  |  |
Goodwill (Note 3) |  | $ 48,048 | $ 44,200
Intra-Cellular Therapies, Inc. |  |  |
Assets acquired: |  |  |
Cash and cash equivalents | $ 200 |  |
Marketable securities | 600 |  |
Other current & non-current assets | 300 |  |
Amortizable intangibles asset | 5,200 |  |
Goodwill (Note 3) | 2,900 |  |
Total assets acquired | 17,500 |  |
Liabilities assumed: |  |  |
Deferred taxes | 2,800 |  |
Other current & non-current liabilities | 200 |  |
Total liabilities assumed | 3,000 |  |
Total assets acquired and liabilities assumed | $ 14,500 |  |
Weighted average useful life | 8 years |  |
Number of intangible assets acquired | intangibleAsset | 2 |  |
Probability of success factor | 95.00% |  |
Intra-Cellular Therapies, Inc. | In-process research and development |  |  |
Assets acquired: |  |  |
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Indefinite-Lived | $ 8,300 |  |
Intra-Cellular Therapies, Inc. | Minimum |  |  |
Liabilities assumed: |  |  |
Acquired finite-lived intangible assets, discount rate | 11.50% |  |
Probability of success factor | 34.00% |  |
Intra-Cellular Therapies, Inc. | Maximum |  |  |
Liabilities assumed: |  |  |
Acquired finite-lived intangible assets, discount rate | 12.50% |  |
Probability of success factor | 50.00% |  |

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