Liabilities Related to Business Combinations and to Non-Controlling Interests - Additional Information (Details) - EUR (€) € in Millions |
Jun. 30, 2025 |
Dec. 31, 2024 |
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| Disclosure Of Liabilities Related To Business Combinations And To Noncontrolling Interests [Line Items] | ||||
| Fair value of contingent consideration payable | [1] | € 564 | € 641 | |
| 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 | € 563 | € 568 | ||
| Increase in fair value of liability | 10.00% | |||
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