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Restructuring costs and similar items - Summary of Restructuring Costs and Similar Items (Details) - EUR (€) € in Millions | 6 Months Ended
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Jun. 30, 2026 | Jun. 30, 2025
Disclosure of attribution of expenses by nature to their function [line items] |  |
Employee-related expenses | € 284 | € 201
Charges, gains or losses on assets | 179 | 109
Costs of transformation programs | 10 | 80
Others | 90 | 40
Total | 563 | € 430
Dynavax |  |
Disclosure of attribution of expenses by nature to their function [line items] |  |
Others | € 73 |

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