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Investments accounted for using the equity method - Additional Information (Details) - EUR (€) | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Associates and joint ventures |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Funding commitments to associates and joint ventures | € 0 | € 0 | € 0

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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Namespace Prefix: | ifrs-full_
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- Definition Commitments made to joint ventures and associates. + References No definition available. + Details
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Namespace Prefix: | sny_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |