Investments accounted for using the equity method (Tables) |
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| Interests In Other Entities [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Investments in Associates and Joint Ventures | Investments accounted for using the equity method consist of associates and joint ventures (see Note B.1. to the consolidated financial statements for the year ended December 31, 2025), and comprise:
(a)Following the loss of control of Opella in 2025, Sanofi holds 48.2% of OPAL JV Co (CD&R holds 50% and Bpifrance holds 1.8%). As of December 31, 2025 the investment included a €241 million loan to OPAL JV Co being in substance part of the investment. In 2026, following finalization of the Opella completion accounts as of April 30, 2025, this loan was converted into ordinary shares. (b)The investment in EUROAPI includes an impairment loss determined by reference to the quoted market price (€1.33 as of June 30, 2026, and €2.27 as of December 31, 2025). (c)Joint venture. (d)Joint venture. MSP Vaccine Company owns 100% of MCM Vaccine BV.
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| Summary of Principal Transactions and Balances with Related Parties | The financial statements include commercial transactions between Sanofi and some equity-accounted investments that are classified as related parties. The principal transactions and balances with related parties are summarized below:
(a) Includes loans to joint ventures and associates. (b) In October 2024, Sanofi raised its investment in EUROAPI by €200 million in the form of a perpetual subordinated hybrid bond. The fair value of this investment as of June 30, 2026 was €84 million, versus €143 million as of December 31, 2025. (c) For the six months ended June 30, 2025, these amounts include transactions between Sanofi and OPAL JV Co for the period from May 1, 2025 through June 30, 2025.
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| Disclosure of unaudited financial statements of subsidiaries explanatory | Key items from the unaudited half-year consolidated financial statements of OPAL JV Co as of June 30, 2026, as provided in accordance with Sanofi’s consolidation timelines, are presented below:
(a) With effect from May 1, 2025, OPAL JV Co is accounted for using the equity method following the loss of control of Opella by Sanofi on April 30, 2025.
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