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Financial derivatives at fair value (Details) - EUR (€) € in Thousands | 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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Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  | € 6,438,000 | € 4,990 |
Cash flow amount |  |  |  |  |  | 156,000 |  |
Not later than one year [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  | € 3,005,000 |  |  |
Cash flow amount |  |  |  |  | (23,000) |  |  |
Later than one year and not later than two years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  | € 43,000 |  |  |  |
Cash flow amount |  |  |  | (18,000) |  |  |  |
Later than two years and not later than three years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  | € 34,000 |  |  |  |  |
Cash flow amount |  |  | (16,000) |  |  |  |  |
Later than three years and not later than four years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  | € 42,000 |  |  |  |  |  |
Cash flow amount |  | (16,000) |  |  |  |  |  |
Later than four years [Member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount | € 3,314,000 |  |  |  |  |  |  |
Cash flow amount | 232,000 |  |  |  |  |  |  |
At fair value [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Net financial derivatives |  |  |  |  |  | 109,000 | € 109,000 | € 153,000
Derivative financial assets [Member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  | 3,170,000 |  |
Cash flow amount |  |  |  |  |  | 296,000 |  |
Derivative financial assets [Member] | Not later than one year [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  | 421,000 |  |  |
Cash flow amount |  |  |  |  | 35,000 |  |  |
Derivative financial assets [Member] | Later than one year and not later than two years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  | 3,000 |  |  |  |
Cash flow amount |  |  |  | (2,000) |  |  |  |
Derivative financial assets [Member] | Later than two years and not later than three years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  | (1,000) |  |  |  |  |
Cash flow amount |  |  | (3,000) |  |  |  |  |
Derivative financial assets [Member] | Later than three years and not later than four years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  | (1,000) |  |  |  |  |  |
Cash flow amount |  | (4,000) |  |  |  |  |  |
Derivative financial assets [Member] | Later than four years [Member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount | 2,748,000 |  |  |  |  |  |  |
Cash flow amount | 270,000 |  |  |  |  |  |  |
Derivative financial assets [Member] | At fair value [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Derivative financial assets [Member] |  |  |  |  |  | 241,000 |  |
Derivative financial assets [Member] | Toll road index linked swaps [Member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  | 76,000 |  |
Cash flow amount |  |  |  |  |  | 158,000 |  |
Derivative financial assets [Member] | Toll road index linked swaps [Member] | Not later than one year [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  | (4,000) |  |  |
Cash flow amount |  |  |  |  | 12,000 |  |  |
Derivative financial assets [Member] | Toll road index linked swaps [Member] | Later than one year and not later than two years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  | (3,000) |  |  |  |
Cash flow amount |  |  |  | 12,000 |  |  |  |
Derivative financial assets [Member] | Toll road index linked swaps [Member] | Later than two years and not later than three years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  | (3,000) |  |  |  |  |
Cash flow amount |  |  | 13,000 |  |  |  |  |
Derivative financial assets [Member] | Toll road index linked swaps [Member] | Later than three years and not later than four years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  | (4,000) |  |  |  |  |  |
Cash flow amount |  | 13,000 |  |  |  |  |  |
Derivative financial assets [Member] | Toll road index linked swaps [Member] | Later than four years [Member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount | 89,000 |  |  |  |  |  |  |
Cash flow amount | 108,000 |  |  |  |  |  |  |
Derivative financial assets [Member] | Toll road index linked swaps [Member] | At fair value [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Derivative financial assets [Member] |  |  |  |  |  | 134,000 |  |
Derivative financial assets [Member] | Corporate cross currency swaps [Member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  | 250,000 |  |
Cash flow amount |  |  |  |  |  | 2,000 |  |
Derivative financial assets [Member] | Corporate cross currency swaps [Member] | Not later than one year [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  | 250,000 |  |  |
Cash flow amount |  |  |  |  | 2,000 |  |  |
Derivative financial assets [Member] | Corporate cross currency swaps [Member] | Later than one year and not later than two years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  | 0 |  |  |  |
Cash flow amount |  |  |  | 0 |  |  |  |
Derivative financial assets [Member] | Corporate cross currency swaps [Member] | Later than two years and not later than three years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  | 0 |  |  |  |  |
Cash flow amount |  |  | 0 |  |  |  |  |
Derivative financial assets [Member] | Corporate cross currency swaps [Member] | Later than three years and not later than four years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  | 0 |  |  |  |  |  |
Cash flow amount |  | 0 |  |  |  |  |  |
Derivative financial assets [Member] | Corporate cross currency swaps [Member] | Later than four years [Member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount | 0 |  |  |  |  |  |  |
Cash flow amount | 0 |  |  |  |  |  |  |
Derivative financial assets [Member] | Corporate cross currency swaps [Member] | At fair value [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Derivative financial assets [Member] |  |  |  |  |  | 1,000 |  |
Derivative financial assets [Member] | Toll road cross currency swaps [Member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  | 1,850,000 |  |
Cash flow amount |  |  |  |  |  | 68,000 |  |
Derivative financial assets [Member] | Toll road cross currency swaps [Member] | Not later than one year [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  | 0 |  |  |
Cash flow amount |  |  |  |  | (19,000) |  |  |
Derivative financial assets [Member] | Toll road cross currency swaps [Member] | Later than one year and not later than two years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  | 0 |  |  |  |
Cash flow amount |  |  |  | (19,000) |  |  |  |
Derivative financial assets [Member] | Toll road cross currency swaps [Member] | Later than two years and not later than three years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  | 0 |  |  |  |  |
Cash flow amount |  |  | (19,000) |  |  |  |  |
Derivative financial assets [Member] | Toll road cross currency swaps [Member] | Later than three years and not later than four years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  | 0 |  |  |  |  |  |
Cash flow amount |  | (19,000) |  |  |  |  |  |
Derivative financial assets [Member] | Toll road cross currency swaps [Member] | Later than four years [Member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount | 1,850,000 |  |  |  |  |  |  |
Cash flow amount | 144,000 |  |  |  |  |  |  |
Derivative financial assets [Member] | Toll road cross currency swaps [Member] | At fair value [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Derivative financial assets [Member] |  |  |  |  |  | 41,000 |  |
Derivative financial assets [Member] | Corporate irs [Member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  | 165,000 |  |
Cash flow amount |  |  |  |  |  | 1,000 |  |
Derivative financial assets [Member] | Corporate irs [Member] | Not later than one year [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  | 0 |  |  |
Cash flow amount |  |  |  |  | 1,000 |  |  |
Derivative financial assets [Member] | Corporate irs [Member] | Later than one year and not later than two years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  | 0 |  |  |  |
Cash flow amount |  |  |  | 0 |  |  |  |
Derivative financial assets [Member] | Corporate irs [Member] | Later than two years and not later than three years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  | 0 |  |  |  |  |
Cash flow amount |  |  | 0 |  |  |  |  |
Derivative financial assets [Member] | Corporate irs [Member] | Later than three years and not later than four years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  | 0 |  |  |  |  |  |
Cash flow amount |  | 0 |  |  |  |  |  |
Derivative financial assets [Member] | Corporate irs [Member] | Later than four years [Member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount | 165,000 |  |  |  |  |  |  |
Cash flow amount | 0 |  |  |  |  |  |  |
Derivative financial assets [Member] | Corporate irs [Member] | At fair value [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Derivative financial assets [Member] |  |  |  |  |  | 1,000 |  |
Derivative financial assets [Member] | Transchile and centella irs [Member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  | 324,000 |  |
Cash flow amount |  |  |  |  |  | 26,000 |  |
Derivative financial assets [Member] | Transchile and centella irs [Member] | Not later than one year [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  | 2,000 |  |  |
Cash flow amount |  |  |  |  | 4,000 |  |  |
Derivative financial assets [Member] | Transchile and centella irs [Member] | Later than one year and not later than two years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  | 2,000 |  |  |  |
Cash flow amount |  |  |  | 3,000 |  |  |  |
Derivative financial assets [Member] | Transchile and centella irs [Member] | Later than two years and not later than three years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  | 0 |  |  |  |  |
Cash flow amount |  |  | 1,000 |  |  |  |  |
Derivative financial assets [Member] | Transchile and centella irs [Member] | Later than three years and not later than four years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  | 0 |  |  |  |  |  |
Cash flow amount |  | 1,000 |  |  |  |  |  |
Derivative financial assets [Member] | Transchile and centella irs [Member] | Later than four years [Member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount | 320,000 |  |  |  |  |  |  |
Cash flow amount | 17,000 |  |  |  |  |  |  |
Derivative financial assets [Member] | Transchile and centella irs [Member] | At fair value [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Derivative financial assets [Member] |  |  |  |  |  | 19,000 |  |
Derivative financial assets [Member] | Dalaman irs [Member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  | 72,000 |  |
Cash flow amount |  |  |  |  |  | 1,000 |  |
Derivative financial assets [Member] | Dalaman irs [Member] | Not later than one year [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  | 0 |  |  |
Cash flow amount |  |  |  |  | 1,000 |  |  |
Derivative financial assets [Member] | Dalaman irs [Member] | Later than one year and not later than two years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  | 0 |  |  |  |
Cash flow amount |  |  |  | 0 |  |  |  |
Derivative financial assets [Member] | Dalaman irs [Member] | Later than two years and not later than three years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  | 0 |  |  |  |  |
Cash flow amount |  |  | 0 |  |  |  |  |
Derivative financial assets [Member] | Dalaman irs [Member] | Later than three years and not later than four years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  | 0 |  |  |  |  |  |
Cash flow amount |  | 0 |  |  |  |  |  |
Derivative financial assets [Member] | Dalaman irs [Member] | Later than four years [Member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount | 72,000 |  |  |  |  |  |  |
Cash flow amount | 0 |  |  |  |  |  |  |
Derivative financial assets [Member] | Dalaman irs [Member] | At fair value [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Derivative financial assets [Member] |  |  |  |  |  | 1,000 |  |
Derivative financial assets [Member] | Toll roads irs [Member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  | 231,000 |  |
Cash flow amount |  |  |  |  |  | 7,000 |  |
Derivative financial assets [Member] | Toll roads irs [Member] | Not later than one year [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  | 0 |  |  |
Cash flow amount |  |  |  |  | 2,000 |  |  |
Derivative financial assets [Member] | Toll roads irs [Member] | Later than one year and not later than two years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  | 0 |  |  |  |
Cash flow amount |  |  |  | 2,000 |  |  |  |
Derivative financial assets [Member] | Toll roads irs [Member] | Later than two years and not later than three years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  | 0 |  |  |  |  |
Cash flow amount |  |  | 2,000 |  |  |  |  |
Derivative financial assets [Member] | Toll roads irs [Member] | Later than three years and not later than four years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  | 0 |  |  |  |  |  |
Cash flow amount |  | 1,000 |  |  |  |  |  |
Derivative financial assets [Member] | Toll roads irs [Member] | Later than four years [Member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount | 231,000 |  |  |  |  |  |  |
Cash flow amount | 0 |  |  |  |  |  |  |
Derivative financial assets [Member] | Toll roads irs [Member] | At fair value [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Derivative financial assets [Member] |  |  |  |  |  | 6,000 |  |
Derivative financial assets [Member] | Equity swaps corporate [Member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  | 54,000 |  |
Cash flow amount |  |  |  |  |  | 29,000 |  |
Derivative financial assets [Member] | Equity swaps corporate [Member] | Not later than one year [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  | 54,000 |  |  |
Cash flow amount |  |  |  |  | 29,000 |  |  |
Derivative financial assets [Member] | Equity swaps corporate [Member] | Later than one year and not later than two years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  | 0 |  |  |  |
Cash flow amount |  |  |  | 0 |  |  |  |
Derivative financial assets [Member] | Equity swaps corporate [Member] | Later than two years and not later than three years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  | 0 |  |  |  |  |
Cash flow amount |  |  | 0 |  |  |  |  |
Derivative financial assets [Member] | Equity swaps corporate [Member] | Later than three years and not later than four years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  | 0 |  |  |  |  |  |
Cash flow amount |  | 0 |  |  |  |  |  |
Derivative financial assets [Member] | Equity swaps corporate [Member] | Later than four years [Member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount | 0 |  |  |  |  |  |  |
Cash flow amount | 0 |  |  |  |  |  |  |
Derivative financial assets [Member] | Equity swaps corporate [Member] | At fair value [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Derivative financial assets [Member] |  |  |  |  |  | 29,000 |  |
Derivative financial assets [Member] | Other derivatives [Member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  | 119,000 |  |
Cash flow amount |  |  |  |  |  | 2,000 |  |
Derivative financial assets [Member] | Other derivatives [Member] | Not later than one year [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  | 117,000 |  |  |
Cash flow amount |  |  |  |  | 2,000 |  |  |
Derivative financial assets [Member] | Other derivatives [Member] | Later than one year and not later than two years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  | 2,000 |  |  |  |
Cash flow amount |  |  |  | 0 |  |  |  |
Derivative financial assets [Member] | Other derivatives [Member] | Later than two years and not later than three years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  | 0 |  |  |  |  |
Cash flow amount |  |  | 0 |  |  |  |  |
Derivative financial assets [Member] | Other derivatives [Member] | Later than three years and not later than four years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  | 0 |  |  |  |  |  |
Cash flow amount |  | 0 |  |  |  |  |  |
Derivative financial assets [Member] | Other derivatives [Member] | Later than four years [Member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount | 0 |  |  |  |  |  |  |
Cash flow amount | 0 |  |  |  |  |  |  |
Derivative financial assets [Member] | Other derivatives [Member] | At fair value [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Derivative financial assets [Member] |  |  |  |  |  | 7,000 |  |
Derivative financial assets [Member] | Construction Division interest rate swaps |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  | 29,000 |  |
Cash flow amount |  |  |  |  |  | 2,000 |  |
Derivative financial assets [Member] | Construction Division interest rate swaps | Not later than one year [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  | 1,000 |  |  |
Cash flow amount |  |  |  |  | 0 |  |  |
Derivative financial assets [Member] | Construction Division interest rate swaps | Later than one year and not later than two years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  | 3,000 |  |  |  |
Cash flow amount |  |  |  | 0 |  |  |  |
Derivative financial assets [Member] | Construction Division interest rate swaps | Later than two years and not later than three years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  | 2,000 |  |  |  |  |
Cash flow amount |  |  | 0 |  |  |  |  |
Derivative financial assets [Member] | Construction Division interest rate swaps | Later than three years and not later than four years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  | 3,000 |  |  |  |  |  |
Cash flow amount |  | 0 |  |  |  |  |  |
Derivative financial assets [Member] | Construction Division interest rate swaps | Later than four years [Member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount | 20,000 |  |  |  |  |  |  |
Cash flow amount | 1,000 |  |  |  |  |  |  |
Derivative financial assets [Member] | Construction Division interest rate swaps | At fair value [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Derivative financial assets [Member] |  |  |  |  |  | 2,000 |  |
Derivative financial liabilities [Member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  | 3,268,000 |  |
Cash flow amount |  |  |  |  |  | (139,000) |  |
Derivative financial liabilities [Member] | Not later than one year [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  | 2,584,000 |  |  |
Cash flow amount |  |  |  |  | (57,000) |  |  |
Derivative financial liabilities [Member] | Later than one year and not later than two years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  | 40,000 |  |  |  |
Cash flow amount |  |  |  | (16,000) |  |  |  |
Derivative financial liabilities [Member] | Later than two years and not later than three years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  | 35,000 |  |  |  |  |
Cash flow amount |  |  | (13,000) |  |  |  |  |
Derivative financial liabilities [Member] | Later than three years and not later than four years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  | 43,000 |  |  |  |  |  |
Cash flow amount |  | (12,000) |  |  |  |  |  |
Derivative financial liabilities [Member] | Later than four years [Member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount | 566,000 |  |  |  |  |  |  |
Cash flow amount | (38,000) |  |  |  |  |  |  |
Derivative financial liabilities [Member] | At fair value [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Derivative financial liabilities |  |  |  |  |  | (132,000) |  |
Derivative financial liabilities [Member] | Toll roads irs [Member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  | 567,000 |  |
Cash flow amount |  |  |  |  |  | (96,000) |  |
Derivative financial liabilities [Member] | Toll roads irs [Member] | Not later than one year [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  | 28,000 |  |  |
Cash flow amount |  |  |  |  | (16,000) |  |  |
Derivative financial liabilities [Member] | Toll roads irs [Member] | Later than one year and not later than two years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  | 37,000 |  |  |  |
Cash flow amount |  |  |  | (16,000) |  |  |  |
Derivative financial liabilities [Member] | Toll roads irs [Member] | Later than two years and not later than three years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  | 32,000 |  |  |  |  |
Cash flow amount |  |  | (14,000) |  |  |  |  |
Derivative financial liabilities [Member] | Toll roads irs [Member] | Later than three years and not later than four years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  | 40,000 |  |  |  |  |  |
Cash flow amount |  | (12,000) |  |  |  |  |  |
Derivative financial liabilities [Member] | Toll roads irs [Member] | Later than four years [Member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount | 430,000 |  |  |  |  |  |  |
Cash flow amount | (37,000) |  |  |  |  |  |  |
Derivative financial liabilities [Member] | Toll roads irs [Member] | At fair value [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Derivative financial liabilities |  |  |  |  |  | (84,000) |  |
Derivative financial liabilities [Member] | Toll roads foreign exchange derivatives [Member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  | 975,000 |  |
Cash flow amount |  |  |  |  |  | (38,000) |  |
Derivative financial liabilities [Member] | Toll roads foreign exchange derivatives [Member] | Not later than one year [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  | 975,000 |  |  |
Cash flow amount |  |  |  |  | (38,000) |  |  |
Derivative financial liabilities [Member] | Toll roads foreign exchange derivatives [Member] | Later than one year and not later than two years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  | 0 |  |  |  |
Cash flow amount |  |  |  | 0 |  |  |  |
Derivative financial liabilities [Member] | Toll roads foreign exchange derivatives [Member] | Later than two years and not later than three years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  | 0 |  |  |  |  |
Cash flow amount |  |  | 0 |  |  |  |  |
Derivative financial liabilities [Member] | Toll roads foreign exchange derivatives [Member] | Later than three years and not later than four years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  | 0 |  |  |  |  |  |
Cash flow amount |  | 0 |  |  |  |  |  |
Derivative financial liabilities [Member] | Toll roads foreign exchange derivatives [Member] | Later than four years [Member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount | 0 |  |  |  |  |  |  |
Cash flow amount | 0 |  |  |  |  |  |  |
Derivative financial liabilities [Member] | Toll roads foreign exchange derivatives [Member] | At fair value [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Derivative financial liabilities |  |  |  |  |  | (38,000) |  |
Derivative financial liabilities [Member] | Corporate foreign exchange derivatives [Member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  | 581,000 |  |
Cash flow amount |  |  |  |  |  | (4,000) |  |
Derivative financial liabilities [Member] | Corporate foreign exchange derivatives [Member] | Not later than one year [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  | 481,000 |  |  |
Cash flow amount |  |  |  |  | (4,000) |  |  |
Derivative financial liabilities [Member] | Corporate foreign exchange derivatives [Member] | Later than one year and not later than two years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  | 0 |  |  |  |
Cash flow amount |  |  |  | 0 |  |  |  |
Derivative financial liabilities [Member] | Corporate foreign exchange derivatives [Member] | Later than two years and not later than three years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  | 0 |  |  |  |  |
Cash flow amount |  |  | 0 |  |  |  |  |
Derivative financial liabilities [Member] | Corporate foreign exchange derivatives [Member] | Later than three years and not later than four years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  | 0 |  |  |  |  |  |
Cash flow amount |  | 0 |  |  |  |  |  |
Derivative financial liabilities [Member] | Corporate foreign exchange derivatives [Member] | Later than four years [Member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount | 100,000 |  |  |  |  |  |  |
Cash flow amount | 0 |  |  |  |  |  |  |
Derivative financial liabilities [Member] | Corporate foreign exchange derivatives [Member] | At fair value [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Derivative financial liabilities |  |  |  |  |  | (4,000) |  |
Derivative financial liabilities [Member] | Airports foreign exchange derivatives [Member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  | 1,068,000 |  |
Cash flow amount |  |  |  |  |  | (3,000) |  |
Derivative financial liabilities [Member] | Airports foreign exchange derivatives [Member] | Not later than one year [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  | 1,068,000 |  |  |
Cash flow amount |  |  |  |  | (3,000) |  |  |
Derivative financial liabilities [Member] | Airports foreign exchange derivatives [Member] | Later than one year and not later than two years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  | 0 |  |  |  |
Cash flow amount |  |  |  | 0 |  |  |  |
Derivative financial liabilities [Member] | Airports foreign exchange derivatives [Member] | Later than two years and not later than three years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  | 0 |  |  |  |  |
Cash flow amount |  |  | 0 |  |  |  |  |
Derivative financial liabilities [Member] | Airports foreign exchange derivatives [Member] | Later than three years and not later than four years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  | 0 |  |  |  |  |  |
Cash flow amount |  | 0 |  |  |  |  |  |
Derivative financial liabilities [Member] | Airports foreign exchange derivatives [Member] | Later than four years [Member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount | 0 |  |  |  |  |  |  |
Cash flow amount | 0 |  |  |  |  |  |  |
Derivative financial liabilities [Member] | Airports foreign exchange derivatives [Member] | At fair value [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Derivative financial liabilities |  |  |  |  |  | (3,000) |  |
Derivative financial liabilities [Member] | Other derivatives [Member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  | 29,000 |  |
Cash flow amount |  |  |  |  |  | 4,000 |  |
Derivative financial liabilities [Member] | Other derivatives [Member] | Not later than one year [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  | 29,000 |  |  |
Cash flow amount |  |  |  |  | 4,000 |  |  |
Derivative financial liabilities [Member] | Other derivatives [Member] | Later than one year and not later than two years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  | 0 |  |  |  |
Cash flow amount |  |  |  | 0 |  |  |  |
Derivative financial liabilities [Member] | Other derivatives [Member] | Later than two years and not later than three years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  | 0 |  |  |  |  |
Cash flow amount |  |  | 0 |  |  |  |  |
Derivative financial liabilities [Member] | Other derivatives [Member] | Later than three years and not later than four years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  | 0 |  |  |  |  |  |
Cash flow amount |  | 0 |  |  |  |  |  |
Derivative financial liabilities [Member] | Other derivatives [Member] | Later than four years [Member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount | 0 |  |  |  |  |  |  |
Cash flow amount | 0 |  |  |  |  |  |  |
Derivative financial liabilities [Member] | Other derivatives [Member] | At fair value [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Derivative financial liabilities |  |  |  |  |  | (1,000) |  |
Derivative financial liabilities [Member] | Thalia interest rate swaps |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  | 49,000 |  |
Cash flow amount |  |  |  |  |  | (1,000) |  |
Derivative financial liabilities [Member] | Thalia interest rate swaps | Not later than one year [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  | 3,000 |  |  |
Cash flow amount |  |  |  |  | € 0 |  |  |
Derivative financial liabilities [Member] | Thalia interest rate swaps | Later than one year and not later than two years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  |  | 3,000 |  |  |  |
Cash flow amount |  |  |  | € 0 |  |  |  |
Derivative financial liabilities [Member] | Thalia interest rate swaps | Later than two years and not later than three years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  | 3,000 |  |  |  |  |
Cash flow amount |  |  | € 0 |  |  |  |  |
Derivative financial liabilities [Member] | Thalia interest rate swaps | Later than three years and not later than four years [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount |  | 3,000 |  |  |  |  |  |
Cash flow amount |  | € 0 |  |  |  |  |  |
Derivative financial liabilities [Member] | Thalia interest rate swaps | Later than four years [Member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Notional amount | 36,000 |  |  |  |  |  |  |
Cash flow amount | € (1,000) |  |  |  |  |  |  |
Derivative financial liabilities [Member] | Thalia interest rate swaps | At fair value [member] |  |  |  |  |  |  |  |
Financial derivatives [Line Items] |  |  |  |  |  |  |  |
Derivative financial liabilities |  |  |  |  |  | € (2,000) |  |

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