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Debt, cash and cash equivalents and lease liabilities - Additional Information (Details) | 12 Months Ended |  |  |
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Dec. 31, 2024 EUR (€) performance_indicator currency credit_facility shares | Dec. 31, 2024 USD ($) | Dec. 31, 2023 EUR (€) program credit_facility bond | Dec. 31, 2024 USD ($) performance_indicator currency credit_facility shares | Mar. 31, 2023 EUR (€) | Mar. 31, 2018 EUR (€)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Number of bond issues redeemed | bond |  |  | 1 |  |  |
Number of credit facilities | credit_facility | 2 |  | 2 | 2 |  |
Number of sustainable development performance indicators | performance_indicator | 2 |  |  | 2 |  |
Number of commercial paper programs | program |  |  | 2 |  |  |
Number of currencies debt is issued in | currency | 2 |  |  | 2 |  |
Sanofi Euro Medium Term Notes (EMTN) bonds | Weighted average interest rate before derivative instruments |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Annual interest rate | 1.70% |  |  | 1.70% |  |
Cash and cash equivalents, invested rate | 4.20% |  |  | 4.20% |  |
Sanofi Euro Medium Term Notes (EMTN) bonds | Weighted average interest rate after derivative instruments |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Annual interest rate | 2.10% |  |  | 2.10% |  |
Cash and cash equivalents, invested rate | 4.10% |  |  | 4.10% |  |
€1,750 million bonds maturing March 2023 |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Credit facilities, amount drawable |  |  |  |  |  | € 600,000,000
€4 billion facility maturing March 2029 |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Credit facilities, amount drawable | € 4,000,000,000 |  |  |  |  |
€4 billion facility maturing March 2029 | Sanofi Euro Medium Term Notes (EMTN) bonds |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Credit facilities, amount drawable |  |  | € 4,000,000,000 |  |  |
€4 billion facility maturing December 2027 |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Credit facilities, amount drawable | € 4,000,000,000 |  |  |  |  |
€4 billion facility maturing December 2027 | Sanofi Euro Medium Term Notes (EMTN) bonds |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Credit facilities, amount drawable |  |  | € 4,000,000,000 |  |  |
1983 to 1987 participating shares issued | Sanofi Euro Medium Term Notes (EMTN) bonds |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Number of participating shares outstanding (in shares) | shares | 57,844 |  |  | 57,844 |  |
Participating shares carrying amount | € 9,000,000 |  |  |  |  |
Commercial paper program in France | Sanofi Euro Medium Term Notes (EMTN) bonds |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Commercial paper programs | 6,000,000,000 |  |  |  |  |
Borrowing, average drawdown | 0.1 |  |  |  |  |
Borrowing, maximum drawdown | € 0.4 |  |  |  |  |
Commercial paper program in USA | Sanofi Euro Medium Term Notes (EMTN) bonds |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Commercial paper programs | $ |  |  |  | $ 10,000,000,000 |  |
Borrowing, average drawdown | $ |  | $ 5.8 |  |  |  |
Borrowing, maximum drawdown | $ |  | $ 8.9 |  |  |  |
Borrowing, drawdown | $ |  |  |  | $ 1.3 |  |
Syndicated Credit Facility One |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Credit facilities, amount drawable |  |  |  |  | € 4,000,000,000 |

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