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Investments accounted for using the equity method - Summary of Principal Transactions and Balances with Related Parties (Details) - Associates and joint ventures - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of transactions between related parties [line items] |  |  |  |  |
Sales(d) | [1] | € 103 | € 157 | € 131 | [2]
Royalties and other income(d) | [1] | 71 | 14 | 21 | [2]
Accounts receivable and other receivables | [3] | 184 | 249 | 330 | [2]
Other Assets, Related Party Transactions | [4] | 189 | 0 | 0 | [2]
Purchases and other expenses (including research expenses)(d) | [1] | 600 | 573 | 472 | [2]
Accounts payable and other liabilities |  | 160 | € 190 | 258 | [2]
EUROAPI |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |
Subordinate Hybrid Bond, Related Party Transactions |  | € 189 |  | € 200 |
[1] | (d)Figures for comparative periods (2023 and 2022) have been re-presented on a consistent basis to reflect the classification of Opella as a discontinued operation.
[2] | (a)In 2022, these items include Sanofi's transactions with EUROAPI from May 10, 2022 (see Note D.1.).
[3] | (b)Includes loans to joint ventures and associates.
[4] | (c)In October 2024, Sanofi raised its investment in EUROAPI by €200 million in the form of a perpetual subordinated hybrid bon d. The fair value of this investment as of December 31, 2024 is €189 million.

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