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Investments accounted for using the equity method - Summary of Investments in Associates and Joint Ventures (Details) - EUR (€) € in Millions | 8 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of transactions between related parties [line items] |  |  |  |
Investments in subsidiaries, joint ventures and associates | € 677 | € 677 | € 250 | € 201
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 | € 97 | 80 | 72
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 | € 104 | 88 | 44
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 | € 84 | 82 | 85
EUROAPI |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Proportion of ownership interest in associate (in percent) | 30.10% | 30.10% |  |
Investments in joint ventures | € 392 | € 392 | € 0 | € 0
MCM Vaccine B.V. | 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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- Definition The amount of investments in subsidiaries, joint ventures and associates in an entity's separate financial statements. [Refer: Associates [member]; Joint ventures [member]; Subsidiaries [member]; Investments in subsidiaries reported in separate financial statements] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2021-01-01 -Paragraph 10 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=27&code=ifrs-tx-2021-en-r&anchor=para_10&doctype=Standard -URIDate 2021-03-24 + Details
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