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Net deferred tax position - Summary of Tax Losses Available for Carry-forward (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of tax losses available for carryforward [line items] |  |  |
Tax losses available for carry-forward | € 8,933 | € 8,503 | € 7,644
Tax loss carry-forwards on asset disposals | 5 | € 5 | € 5
Year 1 |  |  |
Disclosure of tax losses available for carryforward [line items] |  |  |
Tax losses available for carry-forward | 6 |  |
Year 2 |  |  |
Disclosure of tax losses available for carryforward [line items] |  |  |
Tax losses available for carry-forward | 7 |  |
Year 3 |  |  |
Disclosure of tax losses available for carryforward [line items] |  |  |
Tax losses available for carry-forward | 34 |  |
Year 4 |  |  |
Disclosure of tax losses available for carryforward [line items] |  |  |
Tax losses available for carry-forward | 23 |  |
Year 5 |  |  |
Disclosure of tax losses available for carryforward [line items] |  |  |
Tax losses available for carry-forward | 126 |  |
Year 5 and later |  |  |
Disclosure of tax losses available for carryforward [line items] |  |  |
Tax losses available for carry-forward | € 8,737 |  |

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