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Consolidated shareholders’ equity - Summary of Movements Share Capital (Details) - shares |  |  |  |  | 12 Months Ended
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Jul. 24, 2024 | Jul. 27, 2023 | Dec. 14, 2022 | Jul. 27, 2022 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Beginning balance (in shares) |  |  |  |  |  | 1,263,122,721 |  |
Ending balance (in shares) |  |  |  |  |  |  | 1,263,122,721 |
Share capital | Sanofi |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Beginning balance (in shares) |  |  |  |  |  | 1,264,799,969 | 1,260,835,732 | 1,263,560,695
Capital increase by exercise of stock subscription options (in shares) | [1] |  |  |  |  | 398,569 | 504,956 | 490,373
Capital increase by issuance of restricted shares (in shares) | [2] |  |  |  |  | 1,479,787 | 1,330,558 | 1,499,987
Capital increase reserved for employees (in shares) |  | 2,244,396 | 2,128,723 |  | 2,027,057 |  |  |
Reduction in share capital by cancellation of treasury shares (in shares) |  |  |  | 6,742,380 |  | (5,800,000) |  |
Ending balance (in shares) |  |  |  |  |  | 1,263,122,721 | 1,264,799,969 | 1,260,835,732
[1] | (a)Shares issued on exercise of Sanofi stock subscription options.
[2] | (b)Shares vesting under restricted share plans and issued in the period

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