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Debt, cash and cash equivalents and lease liabilities - Summary of Interest Rate of Net Debt 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 Interest Rate of Debt Net of Cash and Cash Equivalent [Line Items] |  |  |  |  |  |  |  |
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]
Net debt | [2] | 8,772 | 7,793 |  | 6,437 |  |  |
Value on redemption after derivative instruments |  |  |  |  |  |  |  |
Disclosure of Interest Rate of Debt Net of Cash and Cash Equivalent [Line Items] |  |  |  |  |  |  |  |
Total debt |  |  | 16,573 |  | 19,273 |  |  |
Cash and cash equivalents |  | (7,365) | (8,738) |  | (12,781) |  |  |
Net debt |  | € 8,806 | € 7,835 |  | € 6,492 |  |  |
Debt, percent |  |  | 100.00% |  | 100.00% |  |  |
Value on redemption after derivative instruments | Fixed-rate debt |  |  |  |  |  |  |  |
Disclosure of Interest Rate of Debt Net of Cash and Cash Equivalent [Line Items] |  |  |  |  |  |  |  |
Total debt |  |  | € 11,382 |  | € 16,386 |  |  |
Debt, percent |  | 69.00% | 69.00% |  | 85.00% |  |  |
Value on redemption after derivative instruments | Floating-rate debt |  |  |  |  |  |  |  |
Disclosure of Interest Rate of Debt Net of Cash and Cash Equivalent [Line Items] |  |  |  |  |  |  |  |
Total debt |  |  | € 5,191 |  | € 2,886 |  |  |
Debt, percent |  | 31.00% | 31.00% |  | 15.00% |  |  |
[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.)

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