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Consolidated shareholders’ equity - Principal Characteristics of Restricted Share Plans (Details) € / shares in Units, € in Millions | 1 Months Ended | 12 Months Ended
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Dec. 31, 2024 shares | Apr. 30, 2024 shares | Dec. 31, 2023 shares | May 31, 2023 shares | Dec. 31, 2022 shares | May 31, 2022 shares | Dec. 31, 2024 EUR (€) shares € / shares | Dec. 31, 2023 EUR (€) shares € / shares | Dec. 31, 2022 EUR (€) shares € / shares
Performance share plan one | With market condition |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Total number of shares awarded (in shares) | shares |  |  |  |  |  |  |  | 147,894 | 126,935 | 123,940
Restricted share plan 2023 | Performance share plan one |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Service period |  |  |  |  |  |  |  |  | 3 years |
Total number of shares awarded (in shares) | shares | [1] |  |  |  |  |  |  |  | 3,838,434 |
Fair value of plan at the date of grant | € |  |  |  |  |  |  |  |  | € 326 |
Restricted share plan 2023 | Performance share plan one | Without market condition |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Total number of shares awarded (in shares) | shares |  |  |  |  |  |  |  |  | 2,425,047 |
Fair value per share awarded (in euros per share) | [2] |  |  |  |  |  |  |  | € 87.69 |
Restricted share plan 2023 | Performance share plan one | With market condition |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Total number of shares awarded (in shares) | shares |  |  |  |  |  |  |  |  | 1,413,387 |
Fair value per share awarded (in euros per share) | [3] |  |  |  |  |  |  |  | € 83.74 |
Fair value per share awarded for three year service period, additional shares (in euros per share) | [4] |  |  |  |  |  |  |  | 43.60 |
Fair value per share awarded for three year service period, to chief executive officer (in euros per share) | [3] |  |  |  |  |  |  |  | € 82.17 |
Restricted share plan 2023 | Performance share plan two |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Service period |  |  |  |  |  |  |  |  | 3 years |
Total number of shares awarded (in shares) | shares | [1] |  |  |  |  |  |  |  | 65,129 |
Fair value of plan at the date of grant | € |  |  |  |  |  |  |  |  | € 5 |
Restricted share plan 2023 | Performance share plan two | Without market condition |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Total number of shares awarded (in shares) | shares |  |  |  |  |  |  |  |  | 944 |
Fair value per share awarded (in euros per share) | [2] |  |  |  |  |  |  |  | € 77.42 |
Restricted share plan 2023 | Performance share plan two | With market condition |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Total number of shares awarded (in shares) | shares |  |  |  | 5,838 |  |  |  |  | 64,185 |
Fair value per share awarded (in euros per share) | [3] |  |  |  |  |  |  |  | € 74.50 |
Fair value per share awarded for three year service period, additional shares (in euros per share) | [4] |  |  |  |  |  |  |  | 34.90 |
Fair value per share awarded for three year service period, to chief executive officer (in euros per share) | [3] |  |  |  |  |  |  |  | € 0 |
Restricted share plan 2022 | Performance share plan one |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Service period |  |  |  |  |  |  |  |  |  | 3 years
Total number of shares awarded (in shares) | shares | [1] |  |  |  |  |  |  |  |  | 3,344,432
Fair value of plan at the date of grant | € |  |  |  |  |  |  |  |  |  | € 294
Restricted share plan 2022 | Performance share plan one | Without market condition |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Total number of shares awarded (in shares) | shares |  |  |  |  |  |  |  |  |  | 2,000,627
Fair value per share awarded (in euros per share) | [2] |  |  |  |  |  |  |  |  | € 91.19
Restricted share plan 2022 | Performance share plan one | With market condition |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Total number of shares awarded (in shares) | shares |  |  |  |  |  |  | 114,874 |  |  | 1,343,805
Fair value per share awarded (in euros per share) | [3] |  |  |  |  |  |  |  |  | € 86.65
Fair value per share awarded for three year service period, additional shares (in euros per share) | [4] |  |  |  |  |  |  |  |  | 49.00
Fair value per share awarded for three year service period, to chief executive officer (in euros per share) | [3] |  |  |  |  |  |  |  |  | € 84.46
Restricted share plan 2022 | Performance share plan two |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Service period |  |  |  |  |  |  |  |  |  | 3 years
Total number of shares awarded (in shares) | shares | [1] |  |  |  |  |  |  |  |  | 109,981
Fair value of plan at the date of grant | € |  |  |  |  |  |  |  |  |  | € 8
Restricted share plan 2022 | Performance share plan two | Without market condition |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Total number of shares awarded (in shares) | shares |  |  |  |  |  |  |  |  |  | 10,335
Fair value per share awarded (in euros per share) | [2] |  |  |  |  |  |  |  |  | € 79.17
Restricted share plan 2022 | Performance share plan two | With market condition |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Total number of shares awarded (in shares) | shares |  |  |  |  |  | 9,066 |  |  |  | 99,646
Fair value per share awarded (in euros per share) | [3] |  |  |  |  |  |  |  |  | € 69.60
Fair value per share awarded for three year service period, additional shares (in euros per share) | [4] |  |  |  |  |  |  |  |  | 54.70
Fair value per share awarded for three year service period, to chief executive officer (in euros per share) | [3] |  |  |  |  |  |  |  |  | € 0
Restricted share plan 2021 | Performance share plan one | With market condition |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Total number of shares awarded (in shares) | shares |  |  |  |  | 121,097 |  |  |  |  |
Restricted share plan 2021 | Performance share plan two | With market condition |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Total number of shares awarded (in shares) | shares |  | 8,229 |  |  |  |  |  |  |  |
Restricted Share Plan 2024 Member | Performance share plan one |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Service period |  |  |  |  |  |  |  | 3 years |  |
Total number of shares awarded (in shares) | shares | [1] |  |  |  |  |  |  | 4,505,145 |  |
Fair value of plan at the date of grant | € |  |  |  |  |  |  |  | € 346 |  |
Restricted Share Plan 2024 Member | Performance share plan one | Without market condition |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Total number of shares awarded (in shares) | shares |  |  |  |  |  |  |  | 2,888,502 |  |
Fair value per share awarded (in euros per share) | [2] |  |  |  |  |  |  | € 81.84 |  |
Restricted Share Plan 2024 Member | Performance share plan one | With market condition |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Total number of shares awarded (in shares) | shares |  |  | 139,665 |  |  |  |  | 1,616,643 |  |
Fair value per share awarded (in euros per share) | [3] |  |  |  |  |  |  | € 72.79 |  |
Fair value per share awarded for three year service period, additional shares (in euros per share) | [4] |  |  |  |  |  |  | 13.50 |  |
Fair value per share awarded for three year service period, to chief executive officer (in euros per share) | [3] |  |  |  |  |  |  | € 72.38 |  |
Restricted Share Plan 2024 Member | Performance share plan two |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Service period |  |  |  |  |  |  |  | 3 years |  |
Total number of shares awarded (in shares) | shares | [1] |  |  |  |  |  |  | 97,100 |  |
Fair value of plan at the date of grant | € |  |  |  |  |  |  |  | € 7 |  |
Restricted Share Plan 2024 Member | Performance share plan two | Without market condition |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Total number of shares awarded (in shares) | shares |  |  |  |  |  |  |  | 6,649 |  |
Fair value per share awarded (in euros per share) | [2] |  |  |  |  |  |  | € 79.51 |  |
Restricted Share Plan 2024 Member | Performance share plan two | With market condition |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Total number of shares awarded (in shares) | shares |  |  |  |  |  |  |  | 90,451 |  |
Fair value per share awarded (in euros per share) | [3] |  |  |  |  |  |  | € 75.11 |  |
Fair value per share awarded for three year service period, additional shares (in euros per share) | [4] |  |  |  |  |  |  | 32.09 |  |
Fair value per share awarded for three year service period, to chief executive officer (in euros per share) | [3] |  |  |  |  |  |  | € 0 |  |
[1] | (a)Includes shares awarded in an additional tranche subject to a higher level of market conditions: 139,665 additional shares awarded in April 2024 and 8,229 awarded in December 2024 (versus 121,097 awarded in May 2023 and 5,838 awarded in December 2023).
[2] | (b) Market price of Sanofi shares at the date of grant, adjusted for dividends expected during the vesting period.
[3] | (c)Weighting between (i) fair value determined using the Monte Carlo model and (ii) market price of Sanofi shares at the date of grant, adjusted for dividends expected during the vesting period.
[4] | (d)Additional tranche subject to a higher level of market conditions: 139,665 additional shares awarded in April 2024 and 8,229 awarded in December 2024 (versus 121,097 awarded in May 2023, 5,838 awarded in December 2023, 114,874 awarded in May 2022 and 9,066 awarded in December 2022).

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