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Profit/(loss) from discontinued operations - Narrative (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Detailed information about profit loss from discontinued operations [Line Items] |  |  |
Profit (loss) from discontinued operations | € 14 | € 16 | € 64
Discontinued operations of the company [Member] | Service division [Member] |  |  |
Detailed information about profit loss from discontinued operations [Line Items] |  |  |
Profit (loss) from discontinued operations | € 14 | € 16 | 64
Discontinued operations of the company [Member] | Service division [Member] | Divestment amey busines UK [Member] |  |  |
Detailed information about profit loss from discontinued operations [Line Items] |  |  |
Net capital gain |  |  | 58
Transfer to the income statement of currency translation differences accumulated in equity |  |  | (156)
Interest rate hedge derivatives |  |  | € (15)

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