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Principal alliances - Collaboration agreements on human therapeutic antibodies (Details) € in Millions, $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Apr. 01, 2020 | Jul. 01, 2015 agreement | Nov. 30, 2007 agreement | Mar. 31, 2022 | Dec. 31, 2022 Rate | Dec. 31, 2023 EUR (€) Rate | Dec. 31, 2023 USD ($) Rate | Dec. 31, 2022 EUR (€) bond | Dec. 31, 2022 USD ($) bond | Dec. 31, 2021 EUR (€) | Dec. 31, 2015
Disclosure of detailed information about Principal Alliances [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | € |  |  |  |  |  | € 43,070 |  | € 42,997 |  | € 37,761 |
US |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about Principal Alliances [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | € |  |  |  |  |  | € 18,512 |  | € 18,275 |  | € 14,385 |
Regeneron Pharmaceuticals, INC | Antibodies Collaboration agreement |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about Principal Alliances [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of agreements signed | agreement |  |  | 2 |  |  |  |  |  |  |  |
Phase III costs, responsibility percentage |  |  |  |  |  | 80.00% | 80.00% |  |  |  |
Phase III costs, responsibility percentage for Regeneron |  |  |  |  |  | 20.00% | 20.00% |  |  |  |
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% | 50.00% | 50.00% |  |
Period before scheduled launch date |  |  |  |  |  | 24 months | 24 months |  |  |  |
Number of payments | bond |  |  |  |  |  |  |  | 2 | 2 |  |
Regeneron Pharmaceuticals, INC | Antibodies Collaboration agreement | Sales of antibodies, first achievement |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about Principal Alliances [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payment related to attainment of goal |  |  |  |  |  |  |  |  | $ 50 |  |
Regeneron Pharmaceuticals, INC | Antibodies Collaboration agreement | Sales of antibodies, first achievement | Antibodies |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about Principal Alliances [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 2,000 |  |
Regeneron Pharmaceuticals, INC | Antibodies Collaboration agreement | Sales of antibodies, second achievement |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about Principal Alliances [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payment related to attainment of goal |  |  |  |  |  |  |  |  | 50 |  |
Regeneron Pharmaceuticals, INC | Antibodies Collaboration agreement | Sales of antibodies, second achievement | Antibodies |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about Principal Alliances [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 2,500 |  |
Regeneron Pharmaceuticals, INC | Antibodies Collaboration agreement | Prior agreement |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about Principal Alliances [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum additional profit-share, in percentage of Regeneron's quarterly profit (in percent) | Rate |  |  |  |  | 10.00% | 10.00% | 10.00% |  |  |  |
Regeneron Pharmaceuticals, INC | Antibodies Collaboration agreement | New agreement |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about Principal Alliances [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum additional profit-share, in percentage of Regeneron's quarterly profit (in percent) | Rate |  |  |  |  |  | 20.00% | 20.00% |  |  |  |
Regeneron Pharmaceuticals, INC | Antibodies Collaboration agreement | Sales Of Antibodies, Third Achievement |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about Principal Alliances [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payment related to attainment of goal |  |  |  |  |  |  | $ 50 |  |  |  |
Regeneron Pharmaceuticals, INC | Antibodies Collaboration agreement | Sales Of Antibodies, Third Achievement | Antibodies |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about Principal Alliances [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  | $ 3,000 |  |  |  |
Regeneron Pharmaceuticals, INC | Antibodies Collaboration agreement | US |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about Principal Alliances [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of profits and losses arising from commercial operations |  |  |  |  |  | 50.00% | 50.00% |  |  |  |
Regeneron Pharmaceuticals, INC | Antibodies Collaboration agreement | Outside the United States |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about Principal Alliances [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of losses arising from commercial operations |  |  |  |  |  | 55.00% | 55.00% |  |  |  |
Royalty expense, percentage (percentage) | 5.00% |  |  |  |  |  |  |  |  |  |
Regeneron Pharmaceuticals, INC | Antibodies Collaboration agreement | Outside the United States | Bottom of range |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about Principal Alliances [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of profits arising from commercial operations |  |  |  |  |  | 55.00% | 55.00% |  |  |  |
Regeneron Pharmaceuticals, INC | Antibodies Collaboration agreement | Outside the United States | Top of range |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about Principal Alliances [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of profits arising from commercial operations |  |  |  |  |  | 65.00% | 65.00% |  |  |  |
Regeneron Pharmaceuticals, INC | Immuno-oncology collaboration agreement |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about Principal Alliances [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of agreements signed | agreement |  | 2 |  |  |  |  |  |  |  |  |
Maximum additional profit-share, in percentage of Regeneron's quarterly profit (in percent) |  |  |  |  |  |  |  |  |  |  | 10.00%
Percentage of cumulative development costs reimbursed |  |  |  |  |  |  |  |  |  |  | 50.00%

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