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Impairments and disposals (Details) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Impairment and disposals items [Line Items] |  |  |
Impairment and disposals impact on profit loss before tax | € 2,208 | € 35 | € (6)
Impairment and disposals impact on profit loss after tax | 2,191 | 37 | (6)
Capital gains and disposals [Member] |  |  |
Impairment and disposals items [Line Items] |  |  |
Impairment and disposals impact on profit loss before tax | 2,209 | 39 | (3)
Impairment and disposals impact on profit loss after tax | 2,192 | 41 | (3)
Capital gains and disposals [Member] | IRB sale 5% [Member] |  |  |
Impairment and disposals items [Line Items] |  |  |
Impairment and disposals impact on profit loss before tax | 132 |  |
Impairment and disposals impact on profit loss after tax | 116 |  |
Capital gains and disposals [Member] | Serveo sale [Member] |  |  |
Impairment and disposals items [Line Items] |  |  |
Impairment and disposals impact on profit loss before tax | 33 |  |
Impairment and disposals impact on profit loss after tax | 32 |  |
Capital gains and disposals [Member] | Azores sale [Member] |  |  |
Impairment and disposals items [Line Items] |  |  |
Impairment and disposals impact on profit loss before tax |  | 39 |
Impairment and disposals impact on profit loss after tax |  | 41 |
Capital gains and disposals [Member] | Algarve sale [Member] |  |  |
Impairment and disposals items [Line Items] |  |  |
Impairment and disposals impact on profit loss before tax |  |  | (3)
Impairment and disposals impact on profit loss after tax |  |  | (3)
Capital gains and disposals [Member] | 19,75% HAH Sale [Member] |  |  |
Impairment and disposals items [Line Items] |  |  |
Impairment and disposals impact on profit loss before tax | 2,023 |  |
Impairment and disposals impact on profit loss after tax | 2,023 |  |
Capital gains and disposals [Member] | Vertiports sale [Member] |  |  |
Impairment and disposals items [Line Items] |  |  |
Impairment and disposals impact on profit loss before tax | 2 |  |
Impairment and disposals impact on profit loss after tax | 2 |  |
Capital gains and disposals [Member] | Equity-accounted availability toll road assets [Member] |  |  |
Impairment and disposals items [Line Items] |  |  |
Impairment and disposals impact on profit loss before tax | 19 |  |
Impairment and disposals impact on profit loss after tax | 19 |  |
Impairment gains losses axis [Member] |  |  |
Impairment and disposals items [Line Items] |  |  |
Impairment and disposals impact on profit loss before tax | (1) | (4) | (3)
Impairment and disposals impact on profit loss after tax | € (1) | (4) | (3)
Impairment gains losses axis [Member] | Impairment of the ownership interest in maaS global [Member] |  |  |
Impairment and disposals items [Line Items] |  |  |
Impairment and disposals impact on profit loss before tax |  |  | (3)
Impairment and disposals impact on profit loss after tax |  |  | € (3)
Impairment gains losses axis [Member] | Aravia [Member] |  |  |
Impairment and disposals items [Line Items] |  |  |
Impairment and disposals impact on profit loss before tax |  | (2) |
Impairment and disposals impact on profit loss after tax |  | (2) |
Impairment gains losses axis [Member] | Sale of zity ownership interest [Member] |  |  |
Impairment and disposals items [Line Items] |  |  |
Impairment and disposals impact on profit loss before tax |  | (2) |
Impairment and disposals impact on profit loss after tax |  | € (2) |

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