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Cover page
 12 Months Ended
Dec. 31, 2024
shares
Entity Information [Line Items]  
Document Type 20-F
Document Registration Statement false
Document Annual Report true
Current Fiscal Year End Date --12-31
Document Period End Date Dec. 31, 2024
Document Transition Report false
Document Shell Company Report false
Entity File Number 001-31368
Entity Registrant Name Sanofi
Entity Incorporation, State or Country Code I0
Entity Address, Address Line One 46, avenue de la Grande Armée
Entity Address, Postal Zip Code 75017
Entity Address, City or Town Paris
Entity Address, Country FR
Entity Common Stock, Shares Outstanding 1,263,122,721
Entity Well-known Seasoned Issuer Yes
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Large Accelerated Filer
Entity Emerging Growth Company false
ICFR Auditor Attestation Flag true
Document Financial Statement Error Correction [Flag] false
Document Accounting Standard International Financial Reporting Standards
Entity Shell Company false
Amendment Flag false
Document Fiscal Year Focus 2024
Document Fiscal Period Focus FY
Entity Central Index Key 0001121404
Business Contact  
Entity Information [Line Items]  
Contact Personnel Name Roy Papatheodorou
Entity Address, Address Line One 46, avenue de la Grande Armée
Entity Address, Postal Zip Code 75017
Entity Address, City or Town Paris
Entity Address, Country FR
City Area Code 33
Local Phone Number 1 53 77 40 00
American Depositary Shares, each representing one half of one ordinary share, par value €2 per share  
Entity Information [Line Items]  
Title of 12(b) Security American Depositary Shares, each representing one half of one ordinary share, par value €2 per share
Trading Symbol SNY
Security Exchange Name NASDAQ
Ordinary shares, par value €2 per share  
Entity Information [Line Items]  
Title of 12(b) Security Ordinary shares, par value €2 per share
Security Exchange Name NASDAQ