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Debt, cash and cash equivalents and lease liabilities - Additional Information (Details) € in Millions, patient in Millions | 12 Months Ended |  |  |  |  |  |
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Dec. 31, 2022 USD ($) bond | Dec. 31, 2022 EUR (€) credit_facility currency shares | Dec. 31, 2022 USD ($) credit_facility currency shares | Apr. 30, 2022 EUR (€) Country patient tranche | Dec. 31, 2021 performance_indicator credit_facility | Mar. 31, 2019 EUR (€) | Sep. 30, 2016 EUR (€) | Sep. 30, 2014 EUR (€)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Number of bond issues redeemed | bond | 3 |  |  |  |  |  |  |
Number of credit facilities | credit_facility |  | 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] |  |  |  |  |  |  |  |
Bonds, interest rate (in percent) |  | 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] |  |  |  |  |  |  |  |
Bonds, interest rate (in percent) |  | 2.50% | 2.50% |  |  |  |  |
Cash and cash equivalents, invested rate |  | 4.00% | 4.00% |  |  |  |  |
Sanofi sustainability-linked credit facilities |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Number of credit facilities | credit_facility |  |  |  |  | 2 |  |  |
Number of sustainable development performance indicators | performance_indicator |  |  |  |  | 2 |  |  |
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 |  | 74,996 | 74,996 |  |  |  |  |
Participating shares carrying amount |  | € 11 |  |  |  |  |  |
Syndicated credit facility, expires in 2022 |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Credit facilities, amount drawable |  | 4,000 |  |  |  |  |  |
Syndicated credit facility, expires in 2022 | Sanofi Euro Medium Term Notes (EMTN) bonds |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Credit facilities, amount drawable |  | 4,000 |  |  |  |  |  |
Syndicated credit facility, expires in December 2025 |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Credit facilities, amount drawable |  | 4,000 |  |  |  |  |  |
Syndicated credit facility, expires in December 2025 | Sanofi Euro Medium Term Notes (EMTN) bonds |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Credit facilities, amount drawable |  | 4,000 |  |  |  |  |  |
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 |  |  |  |  |  |
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 | $ | $ 2,300,000,000 |  |  |  |  |  |  |
Borrowing, maximum drawdown | $ | $ 4,000,000,000 |  |  |  |  |  |  |
Borrowing, drawdown | $ |  |  | $ 0 |  |  |  |  |
Main undrawn confirmed general purpose credit facilities | Sanofi Euro Medium Term Notes (EMTN) bonds |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Credit facilities, amount drawable |  | € 8,000 |  |  |  |  |  |
One Billion Five Hundred Million Bonds, Issued In April 2022 |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Credit facilities, amount drawable |  |  |  | € 1,500 |  |  |  |
Number of tranches | tranche |  |  |  | 2 |  |  |  |
Eight Hundred And Fifty Million Of Fixed Rate Bonds Maturing April Two Thousand Twenty Five |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Credit facilities, amount drawable |  |  |  | € 850 |  |  |  |
Bonds, interest rate (in percent) |  |  |  | 0.875% |  |  |  |
Six Hundred And Fifty Million Of Fixed Rate Bonds Maturing April Two Thousand Twenty Nine |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Credit facilities, amount drawable |  |  |  | € 650 |  |  |  |
Bonds, interest rate (in percent) |  |  |  | 1.25% |  |  |  |
Performance objective, minimum number of patients | patient |  |  |  | 1.5 |  |  |  |
Number of countries | Country |  |  |  | 40 |  |  |  |
One Billion Bonds Maturing January 2022 |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Credit facilities, amount drawable |  |  |  |  |  |  |  | € 1,000
Eight Hundred Fifty Million Bonds Maturing February 2022 |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Credit facilities, amount drawable |  |  |  |  |  | € 850 |  |
Eight Hundred Fifty Million Bonds Maturing June 2022 |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Credit facilities, amount drawable |  |  |  |  |  |  | € 850 |

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