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Debt, cash and cash equivalents and lease liabilities - Summary of Debt by Maturity at Value on Redemption (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about borrowings [line items]        
Interest rate and currency derivatives used to manage debt € 139 € 187 € (56)  
Total debt 16,531 19,218 20,250 € 22,631
Cash and cash equivalents (8,710) (12,736) (10,098) € (13,915)
Interest rate and currency derivatives used to manage cash and cash equivalents (28) (45) (169)  
Net debt 7,793 6,437 9,983  
Lease liabilities 2,030 2,181 2,108  
Sanofi Euro Medium Term Notes (EMTN) bonds | Main undrawn confirmed general purpose credit facilities        
Disclosure of detailed information about borrowings [line items]        
Credit facilities, amount drawable 8,000      
Less than 1 year        
Disclosure of detailed information about borrowings [line items]        
Lease liabilities 291 320 314  
More than 5 years        
Disclosure of detailed information about borrowings [line items]        
Lease liabilities 989 1,129 1,184  
Value on redemption        
Disclosure of detailed information about borrowings [line items]        
Bond issues 15,134 18,861 19,946  
Other bank borrowings 1,248 286 184  
Other borrowings 6 6 40  
Bank credit balances 203 168 189  
Interest rate and currency derivatives used to manage debt (18) (48) (45)  
Total debt 16,573 19,273 20,314  
Cash and cash equivalents (8,710) (12,736) (10,098)  
Interest rate and currency derivatives used to manage cash and cash equivalents (28) (45) (169)  
Net debt 7,835 6,492 10,047  
Value on redemption | Less than 1 year        
Disclosure of detailed information about borrowings [line items]        
Bond issues 718 3,817 2,828  
Other bank borrowings 1,118 187 163  
Other borrowings 6 6 3  
Bank credit balances 203 168 189  
Interest rate and currency derivatives used to manage debt (18) (48) (45)  
Total debt 2,027 4,130 3,138  
Cash and cash equivalents (8,710) (12,736) (10,098)  
Interest rate and currency derivatives used to manage cash and cash equivalents (28) (45) (169)  
Net debt (6,711) (8,651) (7,129)  
Value on redemption | 1 to 2 years        
Disclosure of detailed information about borrowings [line items]        
Bond issues 2,600 600 3,629  
Other bank borrowings 98 61 18  
Other borrowings 0 0 0  
Bank credit balances 0 0 0  
Interest rate and currency derivatives used to manage debt 0 0 0  
Total debt 2,698 661 3,647  
Cash and cash equivalents 0 0 0  
Interest rate and currency derivatives used to manage cash and cash equivalents 0 0 0  
Net debt 2,698 661 3,647  
Value on redemption | 2 to 3 years        
Disclosure of detailed information about borrowings [line items]        
Bond issues 3,010 2,600 600  
Other bank borrowings 1 0 2  
Other borrowings 0 0 0  
Bank credit balances 0 0 0  
Interest rate and currency derivatives used to manage debt 0 0 0  
Total debt 3,011 2,600 602  
Cash and cash equivalents 0 0 0  
Interest rate and currency derivatives used to manage cash and cash equivalents 0 0 0  
Net debt 3,011 2,600 602  
Value on redemption | 3 to 4 years        
Disclosure of detailed information about borrowings [line items]        
Bond issues 1,150 4,160 1,750  
Other bank borrowings 1 0 1  
Other borrowings 0 0 0  
Bank credit balances 0 0 0  
Interest rate and currency derivatives used to manage debt 0 0 0  
Total debt 1,151 4,160 1,751  
Cash and cash equivalents 0 0 0  
Interest rate and currency derivatives used to manage cash and cash equivalents 0 0 0  
Net debt 1,151 4,160 1,751  
Value on redemption | 4 to 5 years        
Disclosure of detailed information about borrowings [line items]        
Bond issues 1,606 0 4,160  
Other bank borrowings 1 0 0  
Other borrowings 0 0 0  
Bank credit balances 0 0 0  
Interest rate and currency derivatives used to manage debt 0 0 0  
Total debt 1,607 0 4,160  
Cash and cash equivalents 0 0 0  
Interest rate and currency derivatives used to manage cash and cash equivalents 0 0 0  
Net debt 1,607 0 4,160  
Value on redemption | More than 5 years        
Disclosure of detailed information about borrowings [line items]        
Bond issues 6,050 7,684 6,979  
Other bank borrowings 29 38 0  
Other borrowings 0 0 37  
Bank credit balances 0 0 0  
Interest rate and currency derivatives used to manage debt 0 0 0  
Total debt 6,079 7,722 7,016  
Cash and cash equivalents 0 0 0  
Interest rate and currency derivatives used to manage cash and cash equivalents 0 0 0  
Net debt € 6,079 € 7,722 € 7,016