Non-current provisions and other non-current liabilities - Summary of Non-Current Provisions and Other Non-Current Liabilities (Details) - EUR (€) € in Millions |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Disclosure Of Non-current Provisions [Line Items] | ||
| Provisions | € 4,592 | € 4,541 |
| Other non-current liabilities | 2,256 | 2,162 |
| Non-current provisions | 6,848 | € 6,703 |
| Antibodies Collaboration Agreement | Swedish Orphan Biovitrum AB | ||
| Disclosure Of Non-current Provisions [Line Items] | ||
| Other non-current liabilities | 1,647 | |
| Antibodies Collaboration Agreement | Swedish Orphan Biovitrum AB | Later than one year and not later than five years | ||
| Disclosure Of Non-current Provisions [Line Items] | ||
| Other non-current liabilities | 916 | |
| Antibodies Collaboration Agreement | Swedish Orphan Biovitrum AB | Total | ||
| Disclosure Of Non-current Provisions [Line Items] | ||
| Other non-current liabilities | € 2,150 |