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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of tax losses available for carryforward [line items] |  |  |
Tax losses available for carry-forward | € 8,503 | € 7,644 | € 6,515
Tax loss carry-forwards on asset disposals | 5 | € 5 | € 6
Year 1 |  |  |
Disclosure of tax losses available for carryforward [line items] |  |  |
Tax losses available for carry-forward | 0 |  |
Year 2 |  |  |
Disclosure of tax losses available for carryforward [line items] |  |  |
Tax losses available for carry-forward | 3 |  |
Year 3 |  |  |
Disclosure of tax losses available for carryforward [line items] |  |  |
Tax losses available for carry-forward | 21 |  |
Year 4 |  |  |
Disclosure of tax losses available for carryforward [line items] |  |  |
Tax losses available for carry-forward | 28 |  |
Year 5 |  |  |
Disclosure of tax losses available for carryforward [line items] |  |  |
Tax losses available for carry-forward | 102 |  |
Year 5 and later |  |  |
Disclosure of tax losses available for carryforward [line items] |  |  |
Tax losses available for carry-forward | € 8,349 |  |

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