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Consolidated Shareholders' Equity - Summary of Treasury Shares Held (Details) - shares shares in Thousands | Jun. 30, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Dec. 31, 2021
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Share Capital, Reserves And Other Equity Interest [Abstract] |  |  |  |
Number of shares (in shares) | 10,900 | 8,200 | 13,430 | 11,020
% of share capital for the period | 0.864% | 0.65% | 1.061% | 0.872%

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- Definition Number of shares held. + References No definition available. + Details
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Namespace Prefix: | sny_
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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-types:percentItemType
Balance Type: | na
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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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