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Principal alliances - Immuno-Oncology Agreement with Regeneron Pharmaceuticals, Inc. (Details) € in Millions, $ in Millions |  |  | 1 Months Ended | 12 Months Ended
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Sep. 30, 2021 USD ($) | Jul. 01, 2015 agreement | Nov. 30, 2022 EUR (€) | Nov. 30, 2022 USD ($) | Jul. 31, 2022 EUR (€) | Jul. 31, 2022 USD ($) | Dec. 31, 2023 EUR (€) | Dec. 31, 2022 EUR (€) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 EUR (€) | Dec. 31, 2015 USD ($)
Disclosure of Principal Alliances [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other operating income/(expenses), net related to Regeneron | € |  |  |  |  |  |  | € (2,979) | € (1,231) |  | € (1,373) |
Assets held for sale or exchange | € |  |  |  |  |  |  | 15 | 85 |  | € 89 |
Regeneron Pharmaceuticals, INC |  |  |  |  |  |  |  |  |  |  |
Disclosure of Principal Alliances [Line Items] |  |  |  |  |  |  |  |  |  |  |
Assets held for sale or exchange | € |  |  |  |  |  |  |  | 226 |  |  |
Regeneron Pharmaceuticals, INC | Immuno-oncology collaboration agreement |  |  |  |  |  |  |  |  |  |  |
Disclosure of 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%
Upfront payments for projects under collaboration agreements | $ |  |  |  |  |  |  |  |  | $ 900 |  |
Regular milestone payments for projects under collaboration agreements |  |  | € 96 | $ 100 |  |  |  |  | $ 100 |  |
Regeneron Pharmaceuticals, INC | Immuno-oncology collaboration agreement | Major Collaboration Agreement |  |  |  |  |  |  |  |  |  |  |
Disclosure of Principal Alliances [Line Items] |  |  |  |  |  |  |  |  |  |  |
Upfront payments for projects under collaboration agreements |  |  |  |  | € 856 | $ 900 |  |  |  |  |
Royalty income percentage (percentage) |  |  |  |  | 11.00% | 11.00% |  |  |  |  |
Other operating income/(expenses), net related to Regeneron | € |  |  |  |  |  |  | 116 | 111 |  |  |
Proceeds from collaboration agreements | € |  |  |  |  |  |  | € 196 | € 952 |  |  |
Regeneron Pharmaceuticals, INC | Immuno-oncology collaboration agreement | Development of cemiplimab (REGN2810) |  |  |  |  |  |  |  |  |  |  |
Disclosure of Principal Alliances [Line Items] |  |  |  |  |  |  |  |  |  |  |
Prior development budget in total | $ |  |  |  |  |  |  |  |  |  |  | $ 1,640
Contractual agreement for anti-programmed cell death protein |  |  |  |  |  |  |  |  |  |  | 5000.00%
Maximum additional funding for PD1 - part of each company | $ | $ 1,840 |  |  |  |  |  |  |  |  |  | $ 820
PD1 sales milestone payment from Sanofi | $ |  |  |  |  |  |  |  |  |  |  | 375
Minimum sales of PD1 in 12-month period to be achieved for milestone payment | $ |  |  |  |  |  |  |  |  |  |  | $ 2,000

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