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Assets held for sale or exchange and liabilities related to assets held for sale or exchange - Summary of Assets Held for Sale or Exchange, and Liabilities Related to Assets Held for Sale or Exchange (Details) - EUR (€) € in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Subclassifications of assets, liabilities and equities [abstract] |  |  |
Non-current assets or disposal groups classified as held for sale | € 13,489 | € 15 | € 85
Liabilities included in disposal groups classified as held for sale | 2,131 | 13 | 10
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |
Non-current assets or disposal groups classified as held for sale | 13,489 | 15 | 85
Liabilities included in disposal groups classified as held for sale | 2,131 | 13 | 10
Opella Business |  |  |
Subclassifications of assets, liabilities and equities [abstract] |  |  |
Non-current assets or disposal groups classified as held for sale | 13,489 | 0 | 0
Liabilities included in disposal groups classified as held for sale | 2,131 | 0 | 0
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |
Non-current assets or disposal groups classified as held for sale | 13,489 | 0 | 0
Liabilities included in disposal groups classified as held for sale | 2,131 | 0 | 0
Others |  |  |
Subclassifications of assets, liabilities and equities [abstract] |  |  |
Non-current assets or disposal groups classified as held for sale | 0 | 15 | 85
Liabilities included in disposal groups classified as held for sale | 0 | 13 | 10
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |
Non-current assets or disposal groups classified as held for sale | 0 | 15 | 85
Liabilities included in disposal groups classified as held for sale | € 0 | € 13 | € 10

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