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Consolidated shareholders’ equity - Summary of Stock Options Outstanding at Each Balance Sheet Date (Details) - Total stock option plans € / shares in Units, € in Millions | 12 Months Ended
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Dec. 31, 2024 EUR (€) shares € / shares | Dec. 31, 2023 EUR (€) shares € / shares | Dec. 31, 2022 EUR (€) shares € / shares | Dec. 31, 2021 EUR (€) shares € / shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Number of options, beginning balance (in shares) | shares | 1,333,013 | 1,837,969 | 2,337,968 |  |
Number of options, options exercisable (in shares) | shares | 934,444 | 1,333,013 | 1,624,569 |  | 1,949,184
Number of options, options exercised (in shares) | shares | (398,569) | (504,956) | (490,373) |  |
Number of options, options cancelled (in shares) | shares |  |  | (9,626) | [1] |
Number of options, ending balance (in shares) | shares | 934,444 | 1,333,013 | 1,837,969 |  | 2,337,968
Average exercise price per share, beginning balance (in euros per share) | € / shares | € 80.53 | € 78.64 | € 77.13 |  |
Average exercise price per share, options exercisable (in euros per share) | € / shares | 80.16 | 80.53 | 78.89 |  | € 78.15
Average exercise price per share, options exercised (in euros per share) | € / shares | 81.38 | 73.65 | 71.39 |  |
Average exercise price per share, options cancelled (in euros per share) | € / shares |  |  | 80.56 | [1] |
Average exercise price per share, ending balance (in euros per share) | € / shares | € 80.16 | € 80.53 | € 78.64 |  | € 77.13
Total, beginning balance | € | € 107 | € 144 | € 180 |  |
Total, options exercisable | € | 75 | 107 | 128 |  | € 152
Total, options exercised | € | (32) | (37) | (35) |  |
Total, options cancelled | € |  |  | (1) | [1] |
Total, ending balance | € | € 75 | € 107 | € 144 |  | € 180
[1] | (a)Mainly due to the grantees leaving Sanofi

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