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Debt, cash and cash equivalents and lease liabilities - Summary of Reconciliation of Carrying Amount to 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 reconciliation of carrying amount to value on redemption [line items] |  |  |  |  |  |  |  |  |
Long-term debt |  | € 11,791 |  | € 14,347 |  | € 14,857 |  |  |
Short-term debt and current portion of long-term debt |  | 4,209 |  | 2,045 |  | 4,174 |  |  |
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 |  |  |
Amortized cost |  |  |  |  |  |  |  |  |
Disclosure of reconciliation of carrying amount to value on redemption [line items] |  |  |  |  |  |  |  |  |
Long-term debt |  | 30 |  |  |  |  |  |  |
Short-term debt and current portion of long-term debt |  | 4 |  |  |  |  |  |  |
Interest rate and currency derivatives used to manage debt |  |  |  |  |  |  |  |  |
Total debt |  | 34 |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |
Interest rate and currency derivatives used to manage cash and cash equivalents |  |  |  |  |  |  |  |  |
Net debt |  | 34 |  |  |  |  |  |  |
Adjustment to debt measured at fair value |  |  |  |  |  |  |  |  |
Disclosure of reconciliation of carrying amount to value on redemption [line items] |  |  |  |  |  |  |  |  |
Long-term debt |  | 119 |  |  |  |  |  |  |
Short-term debt and current portion of long-term debt |  | 5 |  |  |  |  |  |  |
Interest rate and currency derivatives used to manage debt |  | (124) |  |  |  |  |  |  |
Total debt |  | 0 |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |
Interest rate and currency derivatives used to manage cash and cash equivalents |  |  |  |  |  |  |  |  |
Net debt |  | 0 |  |  |  |  |  |  |
Value on redemption |  |  |  |  |  |  |  |  |
Disclosure of reconciliation of carrying amount to value on redemption [line items] |  |  |  |  |  |  |  |  |
Long-term debt |  | 11,940 |  | 14,546 |  | 15,143 |  |  |
Short-term debt and current portion of long-term debt |  | 4,218 |  | 2,045 |  | 4,178 |  |  |
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 |  |  |
[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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