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Significant information for the first half of 2026 - Additional information (Details) $ / shares in Units, € in Millions, $ in Billions |  |  | 5 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 06, 2026 | Feb. 10, 2026 EUR (€) | Jun. 30, 2026 EUR (€) | Jun. 30, 2026 EUR (€) | Jun. 30, 2025 EUR (€) | Feb. 10, 2026 USD ($) $ / shares
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |
Net cash flow on acquisition | [1] |  |  |  | € 1,408 | € 538 |
Medley |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |
Percentage of ownership interest disposed |  | 100.00% |  |  |  |  |
Dynavax |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |
Equity interests of acquirer (in USD per share) | $ / shares |  |  |  |  |  |  | $ 15.50
Equity value of acquirer | $ |  |  |  |  |  |  | $ 2.2
Short-term debt |  |  | € 249 |  |  |  | $ 0.3
Goodwill |  |  | 204 |  |  |  |
Net cash flow on acquisition |  |  | € 1,403 |  |  |  |
Dynavax | Biopharma |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |
Revenue of acquiree since acquisition date |  |  |  | € 144 |  |  |
Operating income of acquiree since acquisition date |  |  |  | 89 |  |  |
Loss of acquiree since acquisition date |  |  |  | 63 |  |  |
Amortization of intangible assets of acquiree since acquisition date |  |  |  | 38 |  |  |
Amortisation of Inventories |  |  |  | 44 |  |  |
Restructuring and similar costs |  |  |  | € 63 |  |  |
[1] | This line item includes payments made in respect of contingent consideration identified and recognized as a liability in business combinations. For the six months ended June 30, 2026, this line item includes the net cash outflow arising from the acquisition of Dynavax (see Note B.1.1.). For the six months ended June 30, 2025 it includes the net cash outflow arising from the acquisition of Dren-0201.

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