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Off balance sheet commitments - Additional Information (Details) € in Millions, $ in Millions |  |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 04, 2023 EUR (€) | Oct. 04, 2023 USD ($) | Oct. 03, 2023 USD ($) | Jun. 19, 2023 USD ($) | Mar. 15, 2022 EUR (€) | Feb. 27, 2017 EUR (€) | Mar. 31, 2022 | Dec. 31, 2022 EUR (€) | Dec. 31, 2023 EUR (€) | Dec. 31, 2022 EUR (€) | Oct. 04, 2023 USD ($) | Apr. 27, 2023 EUR (€) | Dec. 31, 2022 USD ($) | Nov. 08, 2022 target | Aug. 17, 2022 target | Mar. 29, 2022 target | Jan. 07, 2022 molecule | Dec. 31, 2021 EUR (€) | Apr. 08, 2021 USD ($) | Feb. 28, 2014
Provisions And Other Current And Non-Current Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments related to research and development relating to projects in research phase |  |  |  |  |  |  |  | € 18,000 | € 16,800 | € 18,000 |  |  |  |  |  |  |  |  |  |
Commitments related to research and development payments contingent upon attainment of sales targets |  |  |  |  |  |  |  | 18,500 | 17,900 | 18,500 |  |  |  |  |  |  |  |  |  |
Commitments related to collaboration, discovery, development and commercialization agreements |  |  |  |  |  |  |  | 8,800 | 10,000 | 8,800 |  |  |  |  |  |  |  |  |  |
Commitments related to attainment of regulatory and sales milestones for commercialized products |  |  |  |  |  |  |  | 7,600 | 8,500 | 7,600 |  |  |  |  |  |  |  |  |  |
Cumulative development costs incurred |  |  |  |  |  |  |  |  | 8,600 |  |  |  |  |  |  |  |  |  |  |
Total credit facilities |  |  |  |  |  |  |  | € 8,000 | € 8,000 | € 8,000 |  |  |  |  |  |  |  | € 8,000 |  |
Commitments received in respect of disposals proceeds receivable and contingent consideration on divestments | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 300 |  |  |  |  |  |  |
World Health Organization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provisions And Other Current And Non-Current Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of pandemic vaccines agreed to transfer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.50%
Percentage of pandemic vaccines agreed to reserve |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.50%
Joint ventures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provisions And Other Current And Non-Current Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of future development expense funded by other party |  |  |  |  |  | 5000.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Scribe Therapeutics |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provisions And Other Current And Non-Current Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Upfront payment | $ |  |  |  | $ 40 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Scribe Therapeutics | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provisions And Other Current And Non-Current Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments related to milestone payments for projects under collaboration agreements | $ |  |  |  | $ 1,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Janssen Pharmaceuticals, Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provisions And Other Current And Non-Current Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Upfront payment | $ |  |  | $ 175 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Teva Pharmaceuticals |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provisions And Other Current And Non-Current Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Upfront payment | € 469 | $ 500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Teva Pharmaceuticals | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provisions And Other Current And Non-Current Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments related to milestone payments for projects under collaboration agreements | € 940 |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  |
Provention Bio, Inc | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provisions And Other Current And Non-Current Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments related to milestone payments for projects under collaboration agreements |  |  |  |  |  |  |  |  |  |  |  | € 946 |  |  |  |  |  |  |  |
Exscientia | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provisions And Other Current And Non-Current Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of novel small molecule candidates developed | molecule |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 |  |  |
IGM Biosciences, Inc | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provisions And Other Current And Non-Current Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of oncology targets under collaboration agreement | target |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |
Number of immunology or inflammation targets under collaboration agreement | target |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |
Atomwise | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provisions And Other Current And Non-Current Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of drug targets under collaboration agreement | target |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |
Insilico Medicine | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provisions And Other Current And Non-Current Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of therapeutic targets under collaboration agreement | target |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |
Lonza | Joint ventures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provisions And Other Current And Non-Current Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in joint ventures |  |  |  |  |  | € 300 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of future development expense funded by company |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts payable partners in collaboration agreements |  |  |  |  |  | € 600 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antibodies Collaboration agreement | Blackstone Life Sciences |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provisions And Other Current And Non-Current Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments related to maximum payments for projects under collaboration agreement |  |  |  |  | € 300 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antibodies Collaboration agreement | Regeneron Pharmaceuticals, INC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provisions And Other Current And Non-Current Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum additional profit-share, in percentage of Regeneron's quarterly profit (in percent) |  |  |  |  |  |  | 10.00% | 20.00% |  |  |  |  |  |  |  |  |  |  |  |
Percentage of cumulative development costs reimbursed |  |  |  |  |  |  |  |  | 50.00% | 50.00% |  |  |  |  |  |  |  |  |  |
Commitments received for development costs |  |  |  |  |  |  |  | € 2,700 | € 2,100 | € 2,700 |  |  |  |  |  |  |  |  |  |
Ablynx NV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provisions And Other Current And Non-Current Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments related to collaboration, discovery, development and commercialization agreements |  |  |  |  |  |  |  | 1,000 | 900 | 1,000 |  |  |  |  |  |  |  |  |  |
Kymab |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provisions And Other Current And Non-Current Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments related to collaboration, discovery, development and commercialization agreements |  |  |  |  |  |  |  | € 200 | 200 | € 200 |  |  |  |  |  |  |  |  |  |
Commitments related to milestone payments for projects under collaboration agreements | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 350 |
Provention Bio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provisions And Other Current And Non-Current Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments related to collaboration, discovery, development and commercialization agreements |  |  |  |  |  |  |  |  | € 300 |  |  |  |  |  |  |  |  |  |  |

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