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Debt, cash and cash equivalents and lease liabilities - Summary of Market Value of Net Debt (Details) - EUR (€) € in Millions | 12 Months Ended |
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt | € 16,137 | € 16,531 | € 19,218 | € 20,250
Market value |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt | 8,165 | 7,086 | 5,227 |
Value on redemption |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total debt | 16,171 | 16,573 | 19,273 |
Total debt at redemption | € 8,806 | € 7,835 | € 6,492 |

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