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Consolidated shareholders’ equity - Summary of Movements Share Capital (Details) - shares |  |  |  |  | 12 Months Ended
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Jul. 27, 2023 | Dec. 14, 2022 | Jul. 27, 2022 | Jul. 28, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Ending balance (in shares) |  |  |  |  | 1,264,799,969 |  |
Share capital | Sanofi |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Beginning balance (in shares) |  |  |  |  | 1,260,835,732 | 1,263,560,695 | 1,258,971,738
Capital increase by exercise of stock subscription options (in shares) |  |  |  |  | 504,956 | 490,373 | 190,076
Capital increase by issuance of restricted shares (in shares) |  |  |  |  | 1,330,558 | 1,499,987 | 1,836,179
Capital increase reserved for employees (in shares) | 2,128,723 |  | 2,027,057 | 2,562,702 |  |  |
Reduction in share capital by cancellation of treasury shares (in shares) |  | (6,742,380) |  |  |  |  |
Ending balance (in shares) |  |  |  |  | 1,264,799,969 | 1,260,835,732 | 1,263,560,695

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