Non-Current Provisions And Other Non-Current Liabilities - Summary of Non-Current Provisions and Other Non-Current Liabilities (Details) - EUR (€) € in Millions |
Jun. 30, 2025 |
Dec. 31, 2024 |
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| Disclosure Of Non-current Provisions [Line Items] | ||||||
| Provisions | € 5,003 | € 5,762 | ||||
| Other non-current liabilities | [1] | 2,113 | 2,334 | |||
| Non-current provisions | [2] | 7,116 | € 8,096 | |||
| Antibodies Collaboration Agreement | Swedish Orphan Biovitrum AB | ||||||
| Disclosure Of Non-current Provisions [Line Items] | ||||||
| Other non-current liabilities | 1,756 | |||||
| Antibodies Collaboration Agreement | Swedish Orphan Biovitrum AB | Later than one year and not later than five years [member] | ||||||
| Disclosure Of Non-current Provisions [Line Items] | ||||||
| Other non-current liabilities | 1,027 | |||||
| Antibodies Collaboration Agreement | Swedish Orphan Biovitrum AB | Total | ||||||
| Disclosure Of Non-current Provisions [Line Items] | ||||||
| Other non-current liabilities | € 2,293 | |||||
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