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Consolidated Shareholders' Equity - Additional Information (Details) - EUR (€) |  |  | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 25, 2023 | May 03, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Jun. 23, 2023 | Feb. 02, 2023 | Jun. 29, 2022 | Feb. 03, 2022
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |
Share capital |  |  | € 2,524,776,362 |  |  |  |  |
Number of shares (in shares) |  |  | 1,262,388,181 |  |  |  |  |
Par value per share (in euros per share) |  |  | € 2 |  |  |  |  |
Employees share ownership plan |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |
Subscription price (in euros per share) |  |  |  |  |  | € 79.58 |  | € 80.21
Number of shares subscribed (in shares) |  |  |  |  | 2,009,306 |  | 1,909,008 |
Number of shares issued immediately for employer's contribution (in shares) |  |  |  |  | 119,417 |  | 118,049 |
Expense recognized |  |  | € 52,000,000 | € 39,000,000 |  |  |  |
Share Repurchase 2022 program |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |
Period of share repurchase program |  | 12 months |  |  |  |  |  |
Number of shares repurchased (in shares) |  |  | 4,000,204 |  |  |  |  |
Amount of shares repurchased |  |  | € 363,000,000 |  |  |  |  |
Share Repurchase 2023 program |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |
Period of share repurchase program | 12 months |  |  |  |  |  |  |
Share capital | Sanofi |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |
Capital increase by exercise of stock subscription options (in shares) |  |  | 245,668 |  |  |  |  |
Number of restricted shares vested (in shares) |  |  | 2,600,012 |  |  |  |  |
Capital increase by issuance of restricted shares (in shares) |  |  | 1,306,781 |  |  |  |  |
Number of restricted shares alloted (in shares) |  |  | 1,293,231 |  |  |  |  |

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