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Impairment of intangible assets (Details) - EUR (€) € in Millions | 6 Months Ended
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Jun. 30, 2026 | Jun. 30, 2025
Disclosure of impairment loss and reversal of impairment loss [abstract] |  |
Impairment loss on other intangible assets | € 1,031 | € 210
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Impairment loss on other intangible assets | 1,031 | € 210
Amlitelimab asset |  |
Disclosure of impairment loss and reversal of impairment loss [abstract] |  |
Impairment loss on other intangible assets | 952 |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Impairment loss on other intangible assets | € 952 |

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- References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2025-01-01 -Paragraph 118 -Subparagraph e -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2025-en-r&anchor=para_118_e_iv&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 263 -Subparagraph e -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_263_e_iv&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 263 -Subparagraph e -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_263_e_iv&doctype=Standard -URIDate 2025-03-27 + Details
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