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Consolidated shareholders’ equity - Additional Information (Details) - EUR (€) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Share capital |  |  | € 2,526,245,442 |  |  |
Number of shares (in shares) |  |  | 1,263,122,721 |  |  |
Par value per share (in euros per share) |  |  | € 2 |  |  |
Hedges of net investments in foreign operations | € (679,000,000) |  | € (574,000,000) |  | € (580,000,000) |
Currency translation differences | 218,000,000 | [1] | € (22,000,000) | [2] | € 442,000,000 | [3]
Opella Business |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Currency translation differences | € (300,000,000) |  |  |  |  |
May 25, 2023 |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Period of share repurchase program |  |  | 18 months |  |  |
May 3, 2022 |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Period of share repurchase program |  |  |  |  | 18 months |
April 30, 2021 |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Period of share repurchase program | 18 months |  |  |  |  |
Stock subscription option plan |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Increase in shareholders equity due to exercise of stock purchase option | € 75,000,000 |  |  |  |  |
Number of shares issued by exercice of each option (in shares) | 1 |  |  |  |  |
[1] | (b)These amounts include gains and losses, and the impact of foreign currency translation of the financial statements of subsidiaries outside the Euro zone.
[2] | (b)These amounts include gains and losses, and the impact of foreign currency translation of the financial statements of subsidiaries outside the Euro zone.
[3] | (a)These amounts include gains and losses, and the impact of foreign currency translation of the financial statements of subsidiaries outside the Euro zone.

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