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Debt, cash and cash equivalents - Additional Information (Details) - 6 months ended Jun. 30, 2026 € in Millions, $ in Billions | USD ($) bond extension program credit_facility tranche | EUR (€) extension program credit_facility bond | EUR (€) tranche
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Disclosure of detailed information about borrowings [Line Items] |  |  |
Number of bonds redeemed | bond | 1 | 1 |
Number of syndicated credit facilities | credit_facility | 2 | 2 |
Number of short-term debt programs | program | 2 | 2 |
Two billion three hundred million bonds |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |
Notional amount |  |  | € 2,300
Number of tranches | tranche | 3 |  | 3
Fixed rate bond maturing march 2029 |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |
Notional amount |  |  | € 1,000
Borrowings, interest rate | 3.00% |  | 3.00%
Fixed rate bond maturing may 2033 |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |
Notional amount |  |  | € 650
Borrowings, interest rate | 3.375% |  | 3.375%
Fixed rate bond maturing May 2037 |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |
Notional amount |  |  | € 650
Borrowings, interest rate | 3.75% |  | 3.75%
Fixed rate bond issue from March 2018 |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |
Notional amount |  |  | € 1,500
Four billion facility maturing on March, 2030 | Sanofi |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |
Notional amount |  |  | 4,000
Three billion eight hundred fifty million facility maturing April 2031 | Sanofi |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |
Notional amount |  |  | 3,850
Number of one-year extension options | extension | 2 | 2 |
Term of option to extend lease | 1 year | 1 year |
Four billion facility maturing April 2026 | Sanofi |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |
Notional amount |  |  | 4,000
Commercial paper program in France | Sanofi |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |
Commercial paper programs |  |  | € 6,000
Borrowing, average drawdown |  | € 100 |
Commercial paper program in USA | Sanofi |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |
Commercial paper programs | $ | $ 10.0 |  |
Borrowing, average drawdown | $ | $ 3.0 |  |

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