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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure of Interest Rate of Debt Net of Cash and Cash Equivalent [Line Items] |  |  |  |
Total debt | € 16,531 | € 19,218 | € 20,250 | € 22,631
Cash and cash equivalents | (8,710) | (12,736) | (10,098) | € (13,915)
Net debt | 7,793 | 6,437 | 9,983 |
Value on redemption after derivative instruments |  |  |  |
Disclosure of Interest Rate of Debt Net of Cash and Cash Equivalent [Line Items] |  |  |  |
Total debt |  | 19,273 | 20,314 |
Cash and cash equivalents | (8,738) | (12,781) | (10,267) |
Net debt | € 7,835 | € 6,492 | € 10,047 |
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 |  | € 16,386 | € 17,612 |
Debt, percent | 69.00% | 85.00% | 87.00% |
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 |  | € 2,886 | € 2,702 |
Debt, percent | 31.00% | 15.00% | 13.00% |

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