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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, 2024 | Dec. 31, 2023
Disclosure of transactions between related parties [line items] |  |  |  |  |
Investments in subsidiaries, joint ventures and associates |  | € 677 | € 316 |  | € 424
EUROAPI |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |
Stock price |  |  | € 2.88 |  | € 5.73
Infraserv GmbH & Co. Höchst KG |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |
Proportion of ownership interest in joint venture (in percent) | [1] |  | 31.20% |  |
Investments in joint ventures | [1] | 97 | € 102 |  | € 90
MSP Vaccine Company (formerly MCM company) |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |
Proportion of ownership interest in joint venture (in percent) | [2] |  | 50.00% |  |
Investments in joint ventures | [2] | 104 | € 81 |  | 96
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 | € 51 |  | 76
EUROAPI |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |
Proportion of ownership interest in associate (in percent) |  | 30.10% | 29.60% | [3] |
Investments in joint ventures | [3] | € 392 | € 82 |  | € 162
Impairment loss recognised in profit or loss |  |  | € (77) |  |
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% |  |
[1] | (b)Joint venture.
[2] | (c)Joint venture. MSP Vaccine Company owns 100% of MCM Vaccine BV
[3] | (a) The investment in EUROAPI includes an impairment loss determined by reference to the quoted market price (€2.88 as of December 31, 2024, and €5.73 as of December 31, 2023)

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