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Investments accounted for using the equity method - Additional Information (Details) - EUR (€)	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Associates and joint ventures
Disclosure of transactions between related parties [line items]
Funding commitments to associates and joint ventures	€ 0	€ 0	€ 0

X

- 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_
Data Type:	xbrli:stringItemType
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X

- 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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: