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Debt, cash and cash equivalents and lease liabilities - Additional Information (Details) € in Millions, $ in Millions |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 08, 2023 EUR (€) extension | Dec. 31, 2023 EUR (€) program credit_facility bond currency performance_indicator shares | Dec. 31, 2023 USD ($) bond | Dec. 31, 2023 USD ($) program credit_facility currency performance_indicator shares | Jun. 30, 2018 USD ($) | Mar. 31, 2018 EUR (€) | Nov. 30, 2013 EUR (€)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Number of bond issues redeemed | bond |  | 3 | 3 |  |  |  |
Number of credit facilities | credit_facility |  | 2 |  | 2 |  |  |
Number of sustainable development performance indicators | performance_indicator |  | 2 |  | 2 |  |  |
Number of commercial paper programs | program |  | 2 |  | 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 |  | 1.60% |  | 1.60% |  |  |
Cash and cash equivalents, invested rate |  | 3.90% |  | 3.90% |  |  |
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 |  | 3.70% |  | 3.70% |  |  |
€1,750 million bonds maturing March 2023 |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Credit facilities, amount drawable |  |  |  |  |  | € 1,750 |
$1,000 million bonds maturing June 2023 |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Credit facilities, amount drawable | $ |  |  |  |  | $ 1,000 |  |
€1,000 million bonds maturing November 2023 |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Credit facilities, amount drawable |  |  |  |  |  |  | € 1,000
€4 billion facility maturing March 2029 |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Credit facilities, amount drawable | € 4,000 | € 4,000 |  |  |  |  |
Credit facilities, extension option, number | extension | 2 |  |  |  |  |  |
Credit facilities, extension option, period | 1 year | 1 year | 1 year |  |  |  |
€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 |  |  |  |  |
Syndicated credit facility canceled |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Credit facilities, amount drawable | € 4,000 |  |  |  |  |  |
€4 billion facility maturing December 2027 |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Credit facilities, amount drawable |  | 4,000 |  |  |  |  |
€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 |  |  |  |  |
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 |  | 58,115 |  | 58,115 |  |  |
Participating shares carrying amount |  | € 9 |  |  |  |  |
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 |  |  |  |  |
Borrowing, average drawdown |  | 200 |  |  |  |  |
Borrowing, maximum drawdown |  | 800 |  |  |  |  |
Borrowing, drawdown |  | € 40 |  |  |  |  |
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 |  |  |
Borrowing, average drawdown | $ |  |  | $ 3,700 |  |  |  |
Borrowing, maximum drawdown | $ |  |  | $ 7,300 |  |  |  |
Borrowing, drawdown | $ |  |  |  | $ 1,000 |  |  |

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