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Consolidated shareholders’ equity - Summary of Treasury Shares Held (Details) - shares shares in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Share Capital, Reserves And Other Equity Interest [Abstract] |  |  |  |
Number of shares (in shares) | 13,450 | 8,200 | 11,020 | 8,280
% of share capital for the period | 1.063% | 0.65% | 0.872% | 0.658%

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- Definition Number of shares held. + References No definition available. + Details
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Namespace Prefix: | sny_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Percentage of share capital for the period. + References No definition available. + Details
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Namespace Prefix: | sny_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Share Capital, Reserves And Other Equity Interest [Abstract] + References No definition available. + Details
Name: | sny_ShareCapitalReservesAndOtherEquityInterestAbstract
Namespace Prefix: | sny_
Data Type: | xbrli:stringItemType
Balance Type: | na
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