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Acquisitions and divestitures (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 22, 2022 | Dec. 31, 2023 | Dec. 31, 2023 | Jan. 01, 2023 | Jan. 02, 2022 | Jun. 30, 2024
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisitions, net of cash acquired (Note 18) |  |  | $ 0 | $ 17,652 | $ 60 |
Payments to acquire businesses, gross |  |  |  | 17,700 |  |
Liabilities |  |  |  | 1,100 |  |
Tangible assets |  |  |  | 17,300 |  |
Goodwill, related to acquisitions |  |  | 0 | 11,056 |  |
Research and development in process |  |  | 313 | 783 | 900 |
Contingent Consideration |  | $ 1,092 | 1,092 | 1,120 |  |
Intangible assets useful life | 14 years |  |  |  |  |
Acquisition related costs |  |  |  | 300 |  |
Proceeds from divestiture of brands |  |  | 200 |  |  |
Asset Acquisition, Consideration Transferred |  |  | 500 |  |  |
Asset, held-for-sale, not part of disposal group |  | 300 | 300 |  |  |
Goodwill, Purchase Accounting Adjustments |  |  | 200 |  |  |
Laminar |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Asset Acquisition, Consideration Transferred |  |  | 400 |  |  |
MedTech |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill, related to acquisitions |  |  | 0 | 11,056 |  |
Research and development in process |  |  |  |  | 900 |
Acquisition costs, period cost |  |  | 200 | $ 300 |  |
Evra and Doxil |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Proceeds from divestiture of brands |  |  |  |  | $ 600 |
Non-Tradeable Contingent Value Right |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Dividends payable, amount per share (in dollars per share) | $ 8.75 |  |  |  |  |
Non-Tradeable Contingent Value Right | Class I Recommendation For Impella |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Dividends payable, amount per share (in dollars per share) | $ 10.00 |  |  |  |  |
Ambrx |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Equity interests issued and issuable |  | 2,000 |  |  |  |
Acquisitions, net of cash acquired (Note 18) |  | 1,900 |  |  |  |
Ambrx | Forecast |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition price (in dollars per share) |  |  |  |  |  | $ 28.00
Abiomed |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Equity interests issued and issuable | $ 17,100 |  |  |  |  |
Acquisition price (in dollars per share) | $ 380.00 |  |  |  |  |
Liabilities |  | 3,000 | 3,000 |  |  |
Cash and equivalents | $ 16,500 |  |  |  |  |
Other assets assumed |  | 20,100 | 20,100 |  |  |
Cash acquired from acquisition |  |  | 300 |  |  |
Goodwill, related to acquisitions |  |  | 11,100 |  |  |
Finite-lived intangible assets acquired |  |  | 6,600 |  |  |
Research and development in process |  |  | 1,100 |  |  |
Marketable securities assumed |  | 600 | 600 |  |  |
Contingent Consideration |  | 704 | 704 |  |  |
Deferred tax liability, acquisition |  | $ 2,000 | $ 2,000 |  |  |
Discount rate | 9.50% |  |  |  |  |
Abiomed | Minimum |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Probability of success factor | 52.00% |  |  |  |  |
Abiomed | Maximum |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Probability of success factor | 70.00% |  |  |  |  |
Abiomed | Non-Tradeable Contingent Value Right |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Non-tradeable contingent value right (in dollars per share) | $ 35.00 |  |  |  |  |
Non-tradeable contingent value right | $ 1,600 |  |  |  |  |
Dividends payable, amount per share (in dollars per share) | $ 17.50 |  |  |  |  |
Contingent consideration | $ 3,700 |  |  |  |  |
Abiomed | Non-Tradeable Contingent Value Right | Impella |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Dividends payable, amount per share (in dollars per share) | $ 7.50 |  |  |  |  |

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