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Investments accounted for using the equity method - Summary of Investments in Associates and Joint Ventures (Details) - EUR (€) € / shares in Units, € in Millions | 8 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2021
Disclosure of transactions between related parties [line items] |  |  |
Investments in subsidiaries, joint ventures and associates | € 677 | € 424 | € 250
EUROAPI |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Stock price |  | € 5.73 |
Infraserv GmbH & Co. Höchst KG |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Proportion of ownership interest in joint venture (in percent) |  | 31.20% |
Investments in joint ventures | 97 | € 90 | 80
MSP Vaccine Company (formerly MCM company) |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Proportion of ownership interest in joint venture (in percent) |  | 50.00% |
Investments in joint ventures | 104 | € 96 | 88
Other investments |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Proportion of ownership interest in joint venture (in percent) |  | 0.00% |
Investments in joint ventures | € 84 | € 76 | 82
EUROAPI |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Proportion of ownership interest in associate (in percent) | 30.10% | 29.80% |
Investments in joint ventures | € 392 | € 162 | € 0
Impairment loss recognised in profit or loss |  | € 231 |
MCM Vaccine BV | MSP Vaccine Company (formerly MCM company) |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Proportion of ownership interest in joint venture (in percent) |  | 100.00% |

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