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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
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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.)

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