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v3.26.1

Consolidated shareholders' equity - Additional Information (Details) - EUR (€) |  |  |  | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 29, 2026 | Apr. 30, 2025 | Feb. 02, 2025 | Jun. 30, 2026 | Jun. 30, 2025 | Jun. 29, 2026 | Jan. 28, 2026 | Jan. 29, 2025
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |
Share capital |  |  |  | € 2,428,198,054 |  |  |  |
Number of shares (in shares) |  |  |  | 1,214,099,027 |  |  |  |
Par value per share (in euros per share) |  |  |  | € 2 |  |  |  |
Payments to acquire or redeem entity's shares |  |  |  | € 1,009,000,000 | € 4,003,000,000 |  |  |
Cancellation of treasury shares |  |  |  | € 596,000,000 |  |  |  |
Share Repurchase 2025 Program |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |
Period of share repurchase program |  | 18 months |  |  |  |  |  |
Number of shares repurchased (in shares) |  |  |  | 12,571,455 |  |  |  |
Payments to acquire or redeem entity's shares |  |  |  | € 1,003,000,000 |  |  |  |
Share repurchase program, authorized, amount |  |  |  |  |  |  |  | € 5,000,000,000
Share Repurchase 2025 Program | L'Oréal |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |
Number of shares repurchased (in shares) |  |  | 29,556,650 |  |  |  |  |
Percentage of Sanofi's share capital acquired |  |  | 2.34% |  |  |  |  |
Share repurchase program, amount paid |  |  | € 3,000,000,000 |  |  |  |  |
Per share value of shares repurchased (in euros per share) |  |  | € 101.50 |  |  |  |  |
Share Repurchase 2026 Program |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |
Period of share repurchase program | 18 months |  |  |  |  |  |  |
Employees share ownership plan |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |
Subscription price (in euros per share) |  |  |  |  |  |  | € 59.87 | € 72.97
Number of shares subscribed (in shares) |  |  |  |  | 2,260,776 | 2,431,494 |  |
Number of shares issued immediately for employer's contribution (in shares) |  |  |  |  | 116,794 | 104,327 |  |
Expense recognized |  |  |  | € 46,000,000 | € 31,000,000 |  |  |
Sanofi |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |
Number of restricted shares vested (in shares) |  |  |  | 3,072,520 |  |  |  |
Number of restricted shares alloted in regards of capital increase (in shares) |  |  |  | 1,185,997 |  |  |  |
Sanofi | Share capital |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |
Capital increase by exercise of stock subscription options (in shares) |  |  |  | 30,070 |  |  |  |
Capital increase by issuance of restricted shares (in shares) |  |  |  | 1,886,523 |  |  |  |

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