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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of tax losses available for carryforward [line items] |  |  |  |
Tax losses available for carry-forward | [1] | € 9,812 | € 8,933 | € 8,503
Tax loss carry-forwards on asset disposals |  | 40 | € 5 | € 5
Year 1 |  |  |  |
Disclosure of tax losses available for carryforward [line items] |  |  |  |
Tax losses available for carry-forward | [1] | 1 |  |
Year 2 |  |  |  |
Disclosure of tax losses available for carryforward [line items] |  |  |  |
Tax losses available for carry-forward | [1] | 17 |  |
Year 3 |  |  |  |
Disclosure of tax losses available for carryforward [line items] |  |  |  |
Tax losses available for carry-forward | [1] | 12 |  |
Year 4 |  |  |  |
Disclosure of tax losses available for carryforward [line items] |  |  |  |
Tax losses available for carry-forward | [1] | 30 |  |
Year 5 |  |  |  |
Disclosure of tax losses available for carryforward [line items] |  |  |  |
Tax losses available for carry-forward | [1] | 187 |  |
Year 5 and later |  |  |  |
Disclosure of tax losses available for carryforward [line items] |  |  |  |
Tax losses available for carry-forward | [1] | € 9,565 |  |
[1] | (a)Excluding tax loss carry-forwards on asset disposals. Such carry-forwards amounted to €40 million as of December 31, 2024, €5 million as of December 31, 2023 and €5 million as of December 31, 2022

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