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Right-of-use assets and associated liabilities (Details) - EUR (€) € in Millions | Dec. 31, 2030 | Dec. 31, 2029 | Dec. 31, 2028 | Dec. 31, 2027 | Dec. 31, 2026 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Disclosure of maturity analysis of operating lease payments [line items] |  |  |  |  |  |  |  |  |
Lease liabilities |  |  |  |  |  |  | € 245 | € 200 | € 184
Corporation division [Member] |  |  |  |  |  |  |  |  |
Disclosure of maturity analysis of operating lease payments [line items] |  |  |  |  |  |  |  |  |
Lease liabilities |  |  |  |  |  |  | 26 |  |
Construction division [Member] |  |  |  |  |  |  |  |  |
Disclosure of maturity analysis of operating lease payments [line items] |  |  |  |  |  |  |  |  |
Lease liabilities |  |  |  |  |  |  | 185 |  |
Toll roads division [Member] |  |  |  |  |  |  |  |  |
Disclosure of maturity analysis of operating lease payments [line items] |  |  |  |  |  |  |  |  |
Lease liabilities |  |  |  |  |  |  | 4 |  |
Other division [Member] |  |  |  |  |  |  |  |  |
Disclosure of maturity analysis of operating lease payments [line items] |  |  |  |  |  |  |  |  |
Lease liabilities |  |  |  |  |  |  | € 30 |  |
Not later than one year [member] |  |  |  |  |  |  |  |  |
Disclosure of maturity analysis of operating lease payments [line items] |  |  |  |  |  |  |  |  |
Lease liabilities |  |  |  |  |  | € 80 |  |  |
Not later than one year [member] | Corporation division [Member] |  |  |  |  |  |  |  |  |
Disclosure of maturity analysis of operating lease payments [line items] |  |  |  |  |  |  |  |  |
Lease liabilities |  |  |  |  |  | 3 |  |  |
Not later than one year [member] | Construction division [Member] |  |  |  |  |  |  |  |  |
Disclosure of maturity analysis of operating lease payments [line items] |  |  |  |  |  |  |  |  |
Lease liabilities |  |  |  |  |  | 68 |  |  |
Not later than one year [member] | Toll roads division [Member] |  |  |  |  |  |  |  |  |
Disclosure of maturity analysis of operating lease payments [line items] |  |  |  |  |  |  |  |  |
Lease liabilities |  |  |  |  |  | 2 |  |  |
Not later than one year [member] | Other division [Member] |  |  |  |  |  |  |  |  |
Disclosure of maturity analysis of operating lease payments [line items] |  |  |  |  |  |  |  |  |
Lease liabilities |  |  |  |  |  | € 7 |  |  |
Later than one year and not later than two years [member] |  |  |  |  |  |  |  |  |
Disclosure of maturity analysis of operating lease payments [line items] |  |  |  |  |  |  |  |  |
Lease liabilities |  |  |  |  | € 53 |  |  |  |
Later than one year and not later than two years [member] | Corporation division [Member] |  |  |  |  |  |  |  |  |
Disclosure of maturity analysis of operating lease payments [line items] |  |  |  |  |  |  |  |  |
Lease liabilities |  |  |  |  | 3 |  |  |  |
Later than one year and not later than two years [member] | Construction division [Member] |  |  |  |  |  |  |  |  |
Disclosure of maturity analysis of operating lease payments [line items] |  |  |  |  |  |  |  |  |
Lease liabilities |  |  |  |  | 44 |  |  |  |
Later than one year and not later than two years [member] | Toll roads division [Member] |  |  |  |  |  |  |  |  |
Disclosure of maturity analysis of operating lease payments [line items] |  |  |  |  |  |  |  |  |
Lease liabilities |  |  |  |  | 2 |  |  |  |
Later than one year and not later than two years [member] | Other division [Member] |  |  |  |  |  |  |  |  |
Disclosure of maturity analysis of operating lease payments [line items] |  |  |  |  |  |  |  |  |
Lease liabilities |  |  |  |  | € 4 |  |  |  |
Later than two years and not later than three years [member] |  |  |  |  |  |  |  |  |
Disclosure of maturity analysis of operating lease payments [line items] |  |  |  |  |  |  |  |  |
Lease liabilities |  |  |  | € 31 |  |  |  |  |
Later than two years and not later than three years [member] | Corporation division [Member] |  |  |  |  |  |  |  |  |
Disclosure of maturity analysis of operating lease payments [line items] |  |  |  |  |  |  |  |  |
Lease liabilities |  |  |  | 3 |  |  |  |  |
Later than two years and not later than three years [member] | Construction division [Member] |  |  |  |  |  |  |  |  |
Disclosure of maturity analysis of operating lease payments [line items] |  |  |  |  |  |  |  |  |
Lease liabilities |  |  |  | 27 |  |  |  |  |
Later than two years and not later than three years [member] | Toll roads division [Member] |  |  |  |  |  |  |  |  |
Disclosure of maturity analysis of operating lease payments [line items] |  |  |  |  |  |  |  |  |
Lease liabilities |  |  |  | 0 |  |  |  |  |
Later than two years and not later than three years [member] | Other division [Member] |  |  |  |  |  |  |  |  |
Disclosure of maturity analysis of operating lease payments [line items] |  |  |  |  |  |  |  |  |
Lease liabilities |  |  |  | € 1 |  |  |  |  |
Later than three years and not later than four years [member] |  |  |  |  |  |  |  |  |
Disclosure of maturity analysis of operating lease payments [line items] |  |  |  |  |  |  |  |  |
Lease liabilities |  |  | € 17 |  |  |  |  |  |
Later than three years and not later than four years [member] | Corporation division [Member] |  |  |  |  |  |  |  |  |
Disclosure of maturity analysis of operating lease payments [line items] |  |  |  |  |  |  |  |  |
Lease liabilities |  |  | 3 |  |  |  |  |  |
Later than three years and not later than four years [member] | Construction division [Member] |  |  |  |  |  |  |  |  |
Disclosure of maturity analysis of operating lease payments [line items] |  |  |  |  |  |  |  |  |
Lease liabilities |  |  | 14 |  |  |  |  |  |
Later than three years and not later than four years [member] | Toll roads division [Member] |  |  |  |  |  |  |  |  |
Disclosure of maturity analysis of operating lease payments [line items] |  |  |  |  |  |  |  |  |
Lease liabilities |  |  | 0 |  |  |  |  |  |
Later than three years and not later than four years [member] | Other division [Member] |  |  |  |  |  |  |  |  |
Disclosure of maturity analysis of operating lease payments [line items] |  |  |  |  |  |  |  |  |
Lease liabilities |  |  | € 0 |  |  |  |  |  |
Later than four years and not later than five years [member] |  |  |  |  |  |  |  |  |
Disclosure of maturity analysis of operating lease payments [line items] |  |  |  |  |  |  |  |  |
Lease liabilities |  | € 11 |  |  |  |  |  |  |
Later than four years and not later than five years [member] | Corporation division [Member] |  |  |  |  |  |  |  |  |
Disclosure of maturity analysis of operating lease payments [line items] |  |  |  |  |  |  |  |  |
Lease liabilities |  | 3 |  |  |  |  |  |  |
Later than four years and not later than five years [member] | Construction division [Member] |  |  |  |  |  |  |  |  |
Disclosure of maturity analysis of operating lease payments [line items] |  |  |  |  |  |  |  |  |
Lease liabilities |  | 8 |  |  |  |  |  |  |
Later than four years and not later than five years [member] | Toll roads division [Member] |  |  |  |  |  |  |  |  |
Disclosure of maturity analysis of operating lease payments [line items] |  |  |  |  |  |  |  |  |
Lease liabilities |  | 0 |  |  |  |  |  |  |
Later than four years and not later than five years [member] | Other division [Member] |  |  |  |  |  |  |  |  |
Disclosure of maturity analysis of operating lease payments [line items] |  |  |  |  |  |  |  |  |
Lease liabilities |  | € 0 |  |  |  |  |  |  |
Later than five years [member] |  |  |  |  |  |  |  |  |
Disclosure of maturity analysis of operating lease payments [line items] |  |  |  |  |  |  |  |  |
Lease liabilities | € 53 |  |  |  |  |  |  |  |
Later than five years [member] | Corporation division [Member] |  |  |  |  |  |  |  |  |
Disclosure of maturity analysis of operating lease payments [line items] |  |  |  |  |  |  |  |  |
Lease liabilities | 11 |  |  |  |  |  |  |  |
Later than five years [member] | Construction division [Member] |  |  |  |  |  |  |  |  |
Disclosure of maturity analysis of operating lease payments [line items] |  |  |  |  |  |  |  |  |
Lease liabilities | 24 |  |  |  |  |  |  |  |
Later than five years [member] | Toll roads division [Member] |  |  |  |  |  |  |  |  |
Disclosure of maturity analysis of operating lease payments [line items] |  |  |  |  |  |  |  |  |
Lease liabilities | 0 |  |  |  |  |  |  |  |
Later than five years [member] | Other division [Member] |  |  |  |  |  |  |  |  |
Disclosure of maturity analysis of operating lease payments [line items] |  |  |  |  |  |  |  |  |
Lease liabilities | € 18 |  |  |  |  |  |  |  |

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