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Financial derivatives at fair value (Tables) | 12 Months Ended
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Dec. 31, 2024
Derivative financial instrument at fair value [Abstract] |
Disclosure of fair value derivatives maturity date of notional maturities and cash flow maturities [Table Text Block] |
TYPE OF INSTRUMENT |  |  | FAIR VALUE | NOTIONAL MATURITIES
(Million euro) |  | (P) Proyecto | BALANCES AT 12/31/2024 | 2025 | 2026 | 2027 | 2028 | 2029 and beyond | TOTAL
ASSET BALANCES |  |  | 241 |  | 421 |  | 3 |  | (1) |  | (1) |  | 2,748 |  | 3,170 |
Toll road Division index-linked swaps |  | P | 134 |  | (4) |  | (3) |  | (3) |  | (4) |  | 89 |  | 76 |
Corporate cross-currency swaps |  |  | 1 |  | 250 |  | — |  | — |  | — |  | — |  | 250 |
Toll road Division cross-currency swaps |  |  | 41 |  | — |  | — |  | — |  | — |  | 1,850 |  | 1,850 |
Corporate interest rate swaps |  |  | 1 |  | — |  | — |  | — |  | — |  | 165 |  | 165 |
Transchile and Centella interest rate swaps |  | P | 19 |  | 2 |  | 2 |  | — |  | — |  | 320 |  | 324 |
Dalaman interest rate swaps |  | P | 1 |  | — |  | — |  | — |  | — |  | 72 |  | 72 |
Toll road Division interest rate swaps |  | P | 6 |  | — |  | — |  | — |  | — |  | 231 |  | 231 |
Corporate equity swaps |  |  | 29 |  | 54 |  | — |  | — |  | — |  | — |  | 54 |
Construction Division interest rate swaps |  | P | 2 |  | 1 |  | 3 |  | 2 |  | 3 |  | 20 |  | 29 |
Other derivatives |  |  | 7 |  | 117 |  | 2 |  | — |  | — |  | — |  | 119 |
LIABILITY BALANCES |  |  | (132) |  | 2,584 |  | 40 |  | 35 |  | 43 |  | 566 |  | 3,268 |
Toll road Division interest rate swaps |  | P | (84) |  | 28 |  | 37 |  | 32 |  | 40 |  | 430 |  | 567 |
Toll road Division foreign exchange derivatives |  |  | (38) |  | 975 |  | — |  | — |  | — |  | — |  | 975 |
Corporate foreign exchange derivatives |  |  | (4) |  | 481 |  | — |  | — |  | — |  | 100 |  | 581 |
Airport Division foreign exchange derivatives |  |  | (3) |  | 1,068 |  | — |  | — |  | — |  | — |  | 1,068 |
Thalia interest rate swaps |  | P | (2) |  | 3 |  | 3 |  | 3 |  | 3 |  | 36 |  | 49 |
Other derivatives |  |  | (1) |  | 29 |  | — |  | — |  | — |  | — |  | 29 |
TOTAL |  |  | 109 |  | 3,005 |  | 43 |  | 34 |  | 42 |  | 3,314 |  | 6,438 |
TYPE OF INSTRUMENT |  |  | FAIR VALUE | CASH FLOW MATURITIES
(Million euro) |  | (P) Proyecto | BALANCES AT 12/31/2024 | 2025 | 2026 | 2027 | 2028 | 2029 and beyond | TOTAL
ASSET BALANCES |  |  | 241 |  | 35 |  | (2) |  | (3) |  | (4) |  | 270 |  | 296 |
Toll road Division index-linked swaps |  | P | 134 |  | 12 |  | 12 |  | 13 |  | 13 |  | 108 |  | 158 |
Corporate cross-currency swaps |  |  | 1 |  | 2 |  | — |  | — |  | — |  | — |  | 2 |
Toll road Division cross-currency swaps |  |  | 41 |  | (19) |  | (19) |  | (19) |  | (19) |  | 144 |  | 68 |
Corporate interest rate swaps |  |  | 1 |  | 1 |  | — |  | — |  | — |  | — |  | 1 |
Transchile and Centella interest rate swaps |  | P | 19 |  | 4 |  | 3 |  | 1 |  | 1 |  | 17 |  | 26 |
Dalaman interest rate swaps |  | P | 1 |  | 1 |  | — |  | — |  | — |  | — |  | 1 |
Toll road Division interest rate swaps |  | P | 6 |  | 2 |  | 2 |  | 2 |  | 1 |  | — |  | 7 |
Corporate equity swaps |  |  | 29 |  | 29 |  | — |  | — |  | — |  | — |  | 29 |
Construction Division interest rate swaps |  | P | 2 |  | — |  | — |  | — |  | — |  | 1 |  | 2 |
Other derivatives |  |  | 7 |  | 2 |  | — |  | — |  | — |  | — |  | 2 |
LIABILITY BALANCES |  |  | (132) |  | (57) |  | (16) |  | (13) |  | (12) |  | (38) |  | (139) |
Toll road Division interest rate swaps |  | P | (84) |  | (16) |  | (16) |  | (14) |  | (12) |  | (37) |  | (96) |
Toll road Division foreign exchange derivatives |  |  | (38) |  | (38) |  | — |  | — |  | — |  | — |  | (38) |
Corporate foreign exchange derivatives |  |  | (4) |  | (4) |  | — |  | — |  | — |  | — |  | (4) |
Airport Division foreign exchange derivatives |  |  | (3) |  | (3) |  | — |  | — |  | — |  | — |  | (3) |
Thalia interest rate swaps |  | P | (2) |  | — |  | — |  | — |  | — |  | (1) |  | (1) |
Other derivatives |  |  | (1) |  | 4 |  | — |  | — |  | — |  | — |  | 4 |
TOTAL |  |  | 109 |  | (23) |  | (18) |  | (16) |  | (16) |  | 232 |  | 156 |
Disclosure of the main effect of the financial derivatives on the income statement and equity [Table Text Block] |
TYPE OF INSTRUMENT (Million euro) | FAIR VALUE | EFFECTS
BALANCES AT 12/31/2024 | BALANCES AT 12/31/2023 | Var. | EFFECT ON RESERVES (I) | FAIR VALUE EFFECT ON PROFIT/(LOSS) (II) | EFFECT ON FINANCIAL PROFIT/(LOSS) (III) | CASH (IV) | EXCHANGE RATE (V) | OTHER EFFECTS ON BALANCE SHEET OR INCOME | TOTAL
Inflation derivatives | 134 |  | 115 |  | 19 |  | 12 |  | 6 |  | 4 |  | (11) |  | — |  | 8 |  | 19 |
Cash flow hedge | 134 |  | 115 |  | 19 |  | 12 |  | 6 |  | 4 |  | (11) |  | — |  | 8 |  | 19 |
Interest rate derivatives | (57) |  | (39) |  | (17) |  | 26 |  | 3 |  | (1) |  | (1) |  | 1 |  | (45) |  | (17) |
Cash flow hedge | (57) |  | (39) |  | (17) |  | 17 |  | 3 |  | (1) |  | (1) |  | 1 |  | (36) |  | (17) |
Fair value hedge | — |  | — |  | — |  | 9 |  | — |  | — |  | — |  | — |  | (9) |  | — |
Cross-currency swaps | 42 |  | 58 |  | (17) |  | 77 |  | (19) |  | 7 |  | 12 |  | (109) |  | 15 |  | (17) |
Cash flow hedge | 1 |  | (13) |  | 14 |  | (1) |  | — |  | 7 |  | (7) |  | — |  | 15 |  | 14 |
Hedge of net investment in foreign operations | 41 |  | 72 |  | (31) |  | 78 |  | (19) |  | — |  | 19 |  | (109) |  | — |  | (31) |
Fair value hedge | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
Foreign exchange derivatives | (39) |  | (1) |  | (38) |  | (2) |  | (12) |  | (6) |  | 65 |  | (23) |  | (60) |  | (38) |
Fair value hedge | (5) |  | — |  | (5) |  | — |  | (1) |  | — |  | — |  | (4) |  | — |  | (5) |
Hedge of net investment in foreign operations | (38) |  | (8) |  | (30) |  | — |  | (5) |  | (6) |  | — |  | (19) |  | — |  | (30) |
Cash flow hedge | (2) |  | — |  | (2) |  | (2) |  | 1 |  | — |  | 58 |  | — |  | (59) |  | (2) |
Speculative | 6 |  | 7 |  | (1) |  | — |  | (7) |  | — |  | 7 |  | — |  | (1) |  | (1) |
Equity swaps | 29 |  | 20 |  | 9 |  | — |  | 17 |  | — |  | (6) |  | — |  | (2) |  | 9 |
Speculative | 29 |  | 20 |  | 9 |  | — |  | 17 |  | — |  | (6) |  | — |  | (2) |  | 9 |
TOTAL | 109 |  | 153 |  | (44) |  | 113 |  | (5) |  | 4 |  | 59 |  | (131) |  | (84) |  | (44) |

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