Liabilities related to business combinations and to non-controlling interests - Additional Information (Details) - EUR (€) € in Millions |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Disclosure Of Liabilities Related To Business Combinations And To Noncontrolling Interests [Line Items] | ||
| Fair value of contingent consideration payable | € 652 | € 585 |
| Shire contingent consideration arising from acquisition of Translate Bio | ||
| Disclosure Of Liabilities Related To Business Combinations And To Noncontrolling Interests [Line Items] | ||
| Fair value of contingent consideration payable | € 585 | € 531 |
| Increase in fair value of liability | 13.00% |