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Investments accounted for using the equity method - Summary of Investments in Associates and Joint Ventures (Details) - EUR (€) € / shares in Units, € in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2026 | Dec. 31, 2025
Disclosure of transactions between related parties [line items] |  |
Investments accounted for using the equity method | € 3,207 | € 3,259
EUROAPI |  |
Disclosure of transactions between related parties [line items] |  |
Stock price (in euro per share) | € 1.33 | € 2.27
MSP Vaccine Company | MCM Vaccine BV |  |
Disclosure of transactions between related parties [line items] |  |
Proportion of ownership interest in subsidiary | 100.00% |
Infraserv GmbH & Co. Höchst KG |  |
Disclosure of transactions between related parties [line items] |  |
Proportion of ownership interest in joint venture | 31.20% |
Investments in joint ventures | € 93 | € 112
MSP Vaccine Company |  |
Disclosure of transactions between related parties [line items] |  |
Proportion of ownership interest in joint venture | 50.00% |
Investments in joint ventures | € 52 | € 59
OPAL JV Co |  |
Disclosure of transactions between related parties [line items] |  |
Proportion of ownership interest in associate | 48.20% | 48.20%
Investments in associates | € 2,965 | € 2,934
Loans to Associates |  | € 241
OPAL JV Co | CD&R |  |
Disclosure of transactions between related parties [line items] |  |
Proportion of ownership interest in associate |  | 50.00%
OPAL JV Co | BPIFrance |  |
Disclosure of transactions between related parties [line items] |  |
Proportion of ownership interest in associate |  | 1.80%
EUROAPI |  |
Disclosure of transactions between related parties [line items] |  |
Proportion of ownership interest in associate | 29.60% |
Investments in associates | € 38 | € 64
Other investments |  |
Disclosure of transactions between related parties [line items] |  |
Proportion of ownership interest in associate | 0.00% |
Investments in associates | € 59 | € 90

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- Definition The amount of investments accounted for using the equity method. The equity method is a method of accounting whereby the investment is initially recognised at cost and adjusted thereafter for the post-acquisition change in the investor's share of net assets of the investee. The investor's profit or loss includes its share of the profit or loss of the investee. The investor's other comprehensive income includes its share of the other comprehensive income of the investee. [Refer: At cost [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2025-01-01 -Paragraph 24 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2025-en-r&anchor=para_24_a&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2025-01-01 -Paragraph B16 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2025-en-r&anchor=para_B16&doctype=Appendix&subtype=B -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 89 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_89&doctype=Standard -URIDate 2025-03-27 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 89 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_89&doctype=Standard -URIDate 2025-03-27 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 54 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_54_e&doctype=Standard -URIDate 2025-03-27 + Details
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