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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about borrowings [line items]        
Interest rate and currency derivatives used to manage debt € 137 € 139 € 187  
Total debt 16,137 16,531 19,218 € 20,250
Cash and cash equivalents (7,441) (8,710) [1] (12,736) [1] € (10,098) [1]
Interest rate and currency derivatives used to manage cash and cash equivalents 76 (28) (45)  
Net debt [2] 8,772 7,793 6,437  
Lease liabilities 1,906 2,030 2,181  
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 377 291 320  
More than 5 years        
Disclosure of detailed information about borrowings [line items]        
Lease liabilities 819 989 1,129  
Value on redemption        
Disclosure of detailed information about borrowings [line items]        
Bond issues 14,592 15,134 18,861  
Other bank borrowings 1,354 1,248 286  
Other borrowings 3 6 6  
Bank credit balances 209 203 168  
Interest rate and currency derivatives used to manage debt 13 (18) (48)  
Total debt 16,171 16,573 19,273  
Cash and cash equivalents (7,441) (8,710) (12,736)  
Interest rate and currency derivatives used to manage cash and cash equivalents 76 (28) (45)  
Net debt [4] 8,806 [3] 7,835 6,492  
Value on redemption | Less than 1 year        
Disclosure of detailed information about borrowings [line items]        
Bond issues 2,716 718 3,817  
Other bank borrowings 1,290 1,118 187  
Other borrowings 3 6 6  
Bank credit balances 209 203 168  
Interest rate and currency derivatives used to manage debt 13 (18) (48)  
Total debt 4,231 2,027 4,130  
Cash and cash equivalents (7,441) (8,710) (12,736)  
Interest rate and currency derivatives used to manage cash and cash equivalents 76 (28) (45)  
Net debt (3,134) [3] (6,711) (8,651)  
Value on redemption | 1 to 2 years        
Disclosure of detailed information about borrowings [line items]        
Bond issues 3,010 2,600 600  
Other bank borrowings 32 98 61  
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 3,042 2,698 661  
Cash and cash equivalents 0 0 0  
Interest rate and currency derivatives used to manage cash and cash equivalents 0 0 0  
Net debt 3,042 [3] 2,698 661  
Value on redemption | 2 to 3 years        
Disclosure of detailed information about borrowings [line items]        
Bond issues 1,150 3,010 2,600  
Other bank borrowings 1 1 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 1,151 3,011 2,600  
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 [3] 3,011 2,600  
Value on redemption | 3 to 4 years        
Disclosure of detailed information about borrowings [line items]        
Bond issues 1,666 1,150 4,160  
Other bank borrowings 1 1 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 1,667 1,151 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 1,667 [3] 1,151 4,160  
Value on redemption | 4 to 5 years        
Disclosure of detailed information about borrowings [line items]        
Bond issues 1,300 1,606 0  
Other bank borrowings 1 1 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 1,301 1,607 0  
Cash and cash equivalents 0 0 0  
Interest rate and currency derivatives used to manage cash and cash equivalents 0 0 0  
Net debt 1,301 [3] 1,607 0  
Value on redemption | More than 5 years        
Disclosure of detailed information about borrowings [line items]        
Bond issues 4,750 6,050 7,684  
Other bank borrowings 29 29 38  
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 4,779 6,079 7,722  
Cash and cash equivalents 0 0 0  
Interest rate and currency derivatives used to manage cash and cash equivalents 0 0 0  
Net debt € 4,779 [3] € 6,079 € 7,722  
[1] Cash flows of the Opella business are presented separately in accordance with IFRS 5 (Non-Current Assets Held for Sale and Discontinued Operations).
[2] (a)Net debt does not include lease liabilities, which amounted to €1,906 million as of December 31, 2024, €2,030 million as of December 31, 2023, and €2,181 million as of December 31, 2022 (see the maturity analysis at Note D.17.2.)
[3] (a)Net debt does not include lease liabilities, which amounted to €1,906 million as of December 31, 2024; €2,030 million as of December 31, 2023;
and €2,181 million as of December 31, 2022 (see the maturity analysis at Note D.17.2.).
[4] (a)Net debt does not include lease liabilities (see the maturity schedule in Note D.17.2.)