v3.26.1
Document and Entity Information
12 Months Ended
Dec. 31, 2025
Document Information [Line Items]  
Document Type 11-K
Entity Registrant Name SANOFI
Entity Central Index Key 0001121404
Amendment Flag false
Puerto Rico Group Savings Plan  
Document Information [Line Items]  
Document Type 11-K
Entity Tax Identification Number 36-4406953
Amendment Flag false