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Other gains and losses, and litigation (Details) - EUR (€) € in Millions | 6 Months Ended
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Jun. 30, 2026 | Jun. 30, 2025
Analysis of income and expense [abstract] |  |
Other losses and litigation | € 95 | € 57

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- References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The line item other gains and losses, and litigation includes the impact of material transactions of an unusual nature or amount. [note B.20.2.] + References No definition available. + Details
Name: | sny_OtherGainsLossesAndLitigation
Namespace Prefix: | sny_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration