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Cash and cash equivalents - Narrative (Details) € in Thousands, $ in Thousands, $ in Millions | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |
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Dec. 31, 2027 EUR (€) | Dec. 31, 2025 EUR (€) | Dec. 31, 2024 EUR (€) | Dec. 31, 2023 EUR (€) | Dec. 31, 2058 | Dec. 31, 2057 Rate | Dec. 31, 2049 USD ($) | Dec. 31, 2032 EUR (€) | Dec. 31, 2031 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 CAD ($) | Nov. 01, 2023 USD ($) | Aug. 01, 2023 USD ($) | Dec. 31, 2022 EUR (€) | Dec. 31, 2018 EUR (€)
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents infrastructure projects |  |  | € 175,000 | € 204,000 |  |  |  |  |  |  |  |  |  |  |  |
Current restricted cash and cash equivalents |  |  | 18,000 | 31,000 |  |  |  |  |  |  |  |  |  |  |  |
Non-current restricted cash and cash equivalents |  |  | 401,000 | 628,000 |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents excluding infrastructure projects |  |  | 4,653,000 | 4,585,000 |  |  |  |  |  |  |  | $ 207 |  |  |  |
Notional amount |  |  | 6,438,000 | 4,990 |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  | 11,288,000 | 11,378,000 |  |  |  |  |  |  |  |  |  |  |  |
Balance working capital |  |  | (1,182,000) | (1,511,000) |  |  |  |  |  |  |  |  |  |  | € (1,353,000) |
Centella transmisión S.A. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Import refinancing operation |  |  | 112,600 |  |  |  |  |  |  |  |  |  |  |  |  |
Returned the line of credit |  |  | 31,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Not later than one year [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  | € 3,005,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
At fair value [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net financial derivatives |  |  | 109,000 | 109,000 |  |  |  |  |  |  |  |  |  |  | 153,000 |
Cross currency swaps [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  | 1,712,000 |  |  |  |  |  |  | $ 260,000 |  |  |  |  |  |
Derivative financial liabilities |  |  |  |  |  |  |  | € 139,000 |  |  |  |  |  |  |  |
Cross currency swaps [Member] | Corporate cross currency swaps [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  | 250,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cross currency swaps [Member] | At fair value [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  | (13,000) |  |  |  |  |  |  |  |  |  |  |  |
Net financial derivatives |  |  |  | 42,000 |  |  |  |  |  |  |  |  |  |  | 58,000 |
Derivative financial liabilities |  |  | 40,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  | 1,272,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives [Member] | At fair value [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net financial derivatives |  |  |  | (57,000) |  |  |  |  |  |  |  |  |  |  | € (39,000) |
Corporate bonds and debentures [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of the issued bond |  |  | 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Other borrowings [Member] | Not later than one year [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
NTE mobility partners segments 3 LLC | TIFIA loan [Member] | US toll roads [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance working capital |  |  | € 437,700 |  |  |  |  |  |  |  |  |  |  |  |  |
NTE mobility partners segments 3 LLC | Segment 3C [Member] | US toll roads [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued including the premium | $ |  |  |  |  |  |  |  |  |  | $ 750,000 |  |  |  |  |  |
LBJ infrastructure group [Member] | Final maturity in 2051 [Member] | US toll roads [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of fixed rate listed bonds included in the senior loan |  |  | 6.57% |  |  |  |  |  |  | 6.57% |  |  |  |  |  |
I77 mobility partners [Member] | US toll roads [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operator completed concession for the broadcast |  |  | € 371,000 |  |  |  |  |  |  |  |  |  |  |  |  |
NTE mobility partners [Member] | US toll roads [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 397,000 |  |
NTE mobility partners [Member] | US toll roads [Member] | Interest rate derivatives [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued | $ |  |  |  |  |  |  |  |  | $ 209,000 | $ 122,800 |  |  |  |  |  |
NTE mobility partners [Member] | Taxable bonds [Member] | Final maturity in 2049 [Member] | US toll roads [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued | $ |  |  |  |  |  |  | $ 871,100 |  |  |  |  |  |  |  |  |
NTE mobility partners [Member] | Private activity bonds [Member] | US toll roads [Member] | Interest rate derivatives [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued | $ |  |  |  |  |  |  |  |  |  | $ 331,800 |  |  |  |  |  |
NTE mobility partners [Member] | Private activity bonds [Member] | Segment 3A-3B [Member] | US toll roads [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 122,600 |  |  |
Bonds Issued with a fixed interest rate of 5% [Member] | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 32,400 |  |  |
Borrowing interest rate on USD 22.5 million [Member] |  |  |  |  |  |  |  |  |  |  |  |  | 5.13% |  |  |
Bonds Issued with a fixed interest rate of 5.13% [Member] | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 22,500 |  |  |
Borrowing interest rate on USD 23.7 million [Member] |  |  |  |  |  |  |  |  |  |  |  |  | 5.25% |  |  |
Bonds Issued with a fixed interest rate of 5.38% [Member] | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 23,700 |  |  |
Borrowing interest rate on USD 122.6 million [Member] |  |  |  |  |  |  |  |  |  |  |  |  | 5.50% |  |  |
Bonds Issued with a fixed interest rate of 5.50% [Member] | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 64,700 |  |  |
Borrowing interest rate on USD 64.7 million [Member] |  |  |  |  |  |  |  |  |  |  |  |  | 5.38% |  |  |
NTE mobility partners [Member] | Fixed interest rate [member] | US toll roads [Member] | Interest rate derivatives [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  | 4.00% |  |  |  |  |  |  | 4.00% |  |  |  |  |  |
NTE mobility partners [Member] | Fixed interest rate [member] | Private activity bonds [Member] | US toll roads [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.50% |  |
Borrowing interest rate on USD 32,4 million [Member] |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |
NTE mobility partners [Member] | Fixed interest rate [member] | Lower fixed interest rate [Member] | US toll roads [Member] | Interest rate derivatives [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  | 3.92% |  |  |  |  |  |  | 3.92% |  |  |  |  |  |
NTE mobility partners [Member] | Fixed interest rate [member] | Higher fixed interest rate [Member] | US toll roads [Member] | Interest rate derivatives [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  | 5.00% |  |  |  |  |  |  | 5.00% |  |  |  |  |  |
Infrastructure project [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-current restricted cash and cash equivalents |  |  | € 380,000 | 596,000 |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash and cash equivalents |  |  | 398,000 | 627,000 |  |  |  |  |  |  |  |  |  |  |  |
Increase decrease restricted cash and cash equivalents |  |  |  | (228,000) |  |  |  |  |  |  |  |  |  |  |  |
Increase decrease restricted cash and cash equivalents excluding effect of exchange rate changes |  |  | 29,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  |  | 5,199,000 | 4,442,000 |  |  |  |  |  |  |  |  |  |  |  |
Bank borrowings |  |  | 3,200,000 | 3,473,000 |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  | 8,554,000 | 8,070,000 |  |  |  |  |  |  |  |  |  |  |  |
Increase decrease in borrowings other infrastructure project company |  |  |  | (64,000) |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  | 8,400,000 | 7,915,000 |  |  |  |  |  |  |  |  |  |  |  |
Difference between the nominal values and carrying amounts of the borrowings |  |  | 154,000 | 155,000 |  |  |  |  |  |  |  |  |  |  |  |
Credit drawable |  |  | 13,000 | 1,000 |  |  |  |  |  |  |  |  |  |  |  |
Credit limit |  |  | 8,567,000 | 8,070,000 |  |  |  |  |  |  |  |  |  |  |  |
Credit utilized |  |  | 8,554,000 | 8,070,000 |  |  |  |  |  |  |  |  |  |  |  |
Total liquidity |  |  | 557,000 | 817,000 |  |  |  |  |  |  |  |  |  |  |  |
Increase decrease in borrowing excluding the foreign exchange effect and scope changes |  |  |  | 34,000 |  |  |  |  |  |  |  |  |  |  |  |
Infrastructure project [Member] | Not later than one year [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  | 121,000 | 76,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Infrastructure project [Member] | At fair value [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  | 6,774,000 | 7,565,000 |  |  |  |  |  |  |  |  |  |  |  |
Infrastructure project [Member] | Carrying amount [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  | 8,400,000 | 7,915,000 |  |  |  |  |  |  |  |  |  |  |  |
Infrastructure project [Member] | Toll roads division [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase decrease restricted cash and cash equivalents excluding effect of exchange rate changes |  |  | (257,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  | 7,945,000 | 7,410,000 |  |  |  |  |  |  |  |  |  |  |  |
Credit drawable |  |  | 9,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |
Credit limit |  |  | 8,091,000 | 7,545,000 |  |  |  |  |  |  |  |  |  |  |  |
Credit utilized |  |  | 8,082,000 | 7,545,000 |  |  |  |  |  |  |  |  |  |  |  |
Infrastructure project [Member] | Toll roads division [Member] | US toll roads [Member] | I66 mobility partners [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings | $ |  |  |  |  |  |  |  |  |  | $ 2,084,000 |  |  |  |  |  |
Infrastructure project [Member] | Toll roads division [Member] | US toll roads [Member] | I-77 Mobility Partners LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings | $ |  |  |  |  |  |  |  |  |  | 471,000 |  |  |  |  |  |
Infrastructure project [Member] | Toll roads division [Member] | US toll roads [Member] | LBJ infrastructure group [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings | $ |  |  |  |  |  |  |  |  |  | 2,007,000 |  |  |  |  |  |
Infrastructure project [Member] | Toll roads division [Member] | US toll roads [Member] | NTE mobility partners segments 3 LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings | $ |  |  |  |  |  |  |  |  |  | 1,578,000 |  |  |  |  |  |
Infrastructure project [Member] | Toll roads division [Member] | US toll roads [Member] | NTE mobility partners [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings | $ |  |  |  |  |  |  |  |  |  | 1,600,000 |  |  |  |  |  |
Infrastructure project [Member] | Toll roads division [Member] | Spanish toll roads [Member] | Cintra Inversora Autopistas de Cataluña, S.L. (a) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  | 584,900 |  |  |  |  |  |  |  |  |  |  |  |  |
Infrastructure project [Member] | Energy and mobility infrastructures division [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  | 211,000 | 246,000 |  |  |  |  |  |  |  |  |  |  |  |
Credit drawable |  |  | 4,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |
Credit limit |  |  | 220,000 | 255,000 |  |  |  |  |  |  |  |  |  |  |  |
Credit utilized |  |  | 216,000 | 255,000 |  |  |  |  |  |  |  |  |  |  |  |
Infrastructure project [Member] | US toll roads [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  | 7,338,000 | 6,749,000 |  |  |  |  |  |  |  |  |  |  |  |
Credit drawable |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |
Credit limit |  |  | 7,479,000 | 6,889,000 |  |  |  |  |  |  |  |  |  |  |  |
Credit utilized |  |  | 7,479,000 | 6,889,000 |  |  |  |  |  |  |  |  |  |  |  |
Infrastructure project [Member] | Construction division [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  | 103,000 | 106,000 |  |  |  |  |  |  |  |  |  |  |  |
Credit drawable |  |  | 0 | 1,000 |  |  |  |  |  |  |  |  |  |  |  |
Credit limit |  |  | 103,000 | 106,000 |  |  |  |  |  |  |  |  |  |  |  |
Credit utilized |  |  | 102,000 | 106,000 |  |  |  |  |  |  |  |  |  |  |  |
Infrastructure project [Member] | Other european toll roads [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current restricted cash and cash equivalents |  |  | 26,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash and cash equivalents |  |  | 9,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Infrastructure project [Member] | Aragon toll road [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash and cash equivalents |  |  | 17,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Infrastructure project [Member] | NTE mobility partners segments 3 LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash and cash equivalents |  |  | € 22,000 | 23,000 |  |  |  |  |  |  |  |  |  |  |  |
Infrastructure project [Member] | NTE mobility partners segments 3 LLC | Segment 3A-3B [Member] | US toll roads [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bank borrowings | $ |  |  |  |  |  |  |  |  |  |  | $ 221,000 |  |  |  |  |
Infrastructure project [Member] | NTE mobility partners segments 3 LLC | Private activity bonds [Member] | Segment 3A-3B [Member] | US toll roads [Member] | Top of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 265,900 |  |  |
Infrastructure project [Member] | NTE mobility partners segments 3 LLC | Private activity bonds [Member] | Segment 3C [Member] | US toll roads [Member] | Interest rate derivatives [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued | $ |  |  |  |  |  |  |  |  |  | $ 653,900 |  |  |  |  |  |
Infrastructure project [Member] | NTE mobility partners segments 3 LLC | Fixed interest rate [member] | Segment 3A-3B [Member] | TIFIA loan [Member] | US toll roads [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  | 3.84% |  |  |  |  |  |  | 3.84% |  |  |  |  |  |
Infrastructure project [Member] | NTE mobility partners segments 3 LLC | Fixed interest rate [member] | Segment 3C [Member] | US toll roads [Member] | Interest rate derivatives [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  | 5.00% |  |  |  |  |  |  | 5.00% |  |  |  |  |  |
Infrastructure project [Member] | LBJ infrastructure group [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash and cash equivalents |  |  | € 12,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Increase decrease restricted cash and cash equivalents excluding effect of exchange rate changes |  |  |  | € 7,000 |  |  |  |  |  |  |  |  |  |  |  |
Infrastructure project [Member] | LBJ infrastructure group [Member] | US toll roads [Member] | Interest rate derivatives [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued | $ |  |  |  |  |  |  |  |  |  | $ 7,000 |  |  |  |  |  |
Bonds issued including the premium | $ |  |  |  |  |  |  |  |  |  | 615,000 |  |  |  |  |  |
Infrastructure project [Member] | LBJ infrastructure group [Member] | TIFIA loan [Member] | US toll roads [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bank borrowings | $ |  |  |  |  |  |  |  |  |  | 835,600 |  |  |  |  |  |
Infrastructure project [Member] | LBJ infrastructure group [Member] | Credit line [Member] | US toll roads [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount drawn from the line of credit for CAPEX investments | $ |  |  |  |  |  |  |  |  |  | 18,000 |  |  |  |  |  |
Infrastructure project [Member] | LBJ infrastructure group [Member] | Taxable bonds [Member] | US toll roads [Member] | Interest rate derivatives [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued | $ |  |  |  |  |  |  |  |  |  | 615,500 |  |  |  |  |  |
Infrastructure project [Member] | LBJ infrastructure group [Member] | Private activity bonds [Member] | US toll roads [Member] | Interest rate derivatives [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued | $ |  |  |  |  |  |  |  |  |  | 537,500 |  |  |  |  |  |
Infrastructure project [Member] | LBJ infrastructure group [Member] | Lower fixed interest rate [Member] | US toll roads [Member] | Interest rate derivatives [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued | $ |  |  |  |  |  |  |  |  |  | $ 608,500 |  |  |  |  |  |
Infrastructure project [Member] | LBJ infrastructure group [Member] | Fixed interest rate [member] | US toll roads [Member] | Interest rate derivatives [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  | 4.00% |  |  |  |  |  |  | 4.00% |  |  |  |  |  |
Infrastructure project [Member] | LBJ infrastructure group [Member] | Fixed interest rate [member] | TIFIA loan [Member] | US toll roads [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  | 4.22% |  |  |  |  |  |  | 4.22% |  |  |  |  |  |
Infrastructure project [Member] | LBJ infrastructure group [Member] | Fixed interest rate [member] | Credit line [Member] | US toll roads [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  | 4.51% |  |  |  |  |  |  | 4.51% | 4.51% |  |  |  |
Infrastructure project [Member] | LBJ infrastructure group [Member] | Fixed interest rate [member] | Lower fixed interest rate [Member] | US toll roads [Member] | Interest rate derivatives [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate | 2.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Infrastructure project [Member] | LBJ infrastructure group [Member] | Fixed interest rate [member] | Higher fixed interest rate [Member] | US toll roads [Member] | Interest rate derivatives [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  | 3.80% |  |  |  |  |  |  |  |  |  |  |
Infrastructure project [Member] | I77 mobility partners [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase decrease restricted cash and cash equivalents excluding effect of exchange rate changes |  |  | € (101,000) | € 99,000 |  |  |  |  |  |  |  |  |  |  |  |
Infrastructure project [Member] | I77 mobility partners [Member] | US toll roads [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued | $ |  |  |  |  |  |  |  |  |  | $ 100,000 |  |  |  |  |  |
Infrastructure project [Member] | I77 mobility partners [Member] | Fixed interest rate [member] | US toll roads [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  | 5.00% |  |  |  |  |  |  | 5.00% |  |  |  |  |  |
Infrastructure project [Member] | I66 mobility partners [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash and cash equivalents |  |  | € 57,000 | 134,000 |  |  |  |  |  |  |  |  |  |  |  |
Increase decrease restricted cash and cash equivalents excluding effect of exchange rate changes |  |  | € (82,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Infrastructure project [Member] | I66 mobility partners [Member] | TIFIA loan [Member] | US toll roads [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bank borrowings | $ |  |  |  |  |  |  |  |  |  | $ 1,346,900 |  |  |  |  |  |
Infrastructure project [Member] | I66 mobility partners [Member] | Borrowings principal [Member] | TIFIA loan [Member] | Final maturity in 2057 [Member] | US toll roads [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bank borrowings | $ |  |  |  |  |  |  |  |  |  | 21,200 |  |  |  |  |  |
Infrastructure project [Member] | I66 mobility partners [Member] | Private activity bonds [Member] | US toll roads [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued | $ |  |  |  |  |  |  |  |  |  | 737,000 |  |  |  |  |  |
Infrastructure project [Member] | I66 mobility partners [Member] | Lower fixed interest rate [Member] | US toll roads [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued including the premium | $ |  |  |  |  |  |  |  |  |  | $ 800,400 |  |  |  |  |  |
Infrastructure project [Member] | I66 mobility partners [Member] | Fixed interest rate [member] | US toll roads [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  | 5.00% |  |  |  |  |  |  | 5.00% |  |  |  |  |  |
Infrastructure project [Member] | I66 mobility partners [Member] | Fixed interest rate [member] | TIFIA loan [Member] | US toll roads [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate | Rate |  |  |  |  |  | 2.80% |  |  |  |  |  |  |  |  |  |
Infrastructure project [Member] | NTE mobility partners [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash and cash equivalents |  |  | € 281,000 | 333,000 |  |  |  |  |  |  |  |  |  |  |  |
Increase decrease restricted cash and cash equivalents excluding effect of exchange rate changes |  |  | € (70,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Infrastructure project [Member] | Autop terrassa manresa SA [Member] | Spanish toll roads [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate guaranteed by the derivative arranged |  |  | 5.2064% |  |  |  |  |  |  |  |  |  |  |  |  |
Net financial derivatives |  |  | € (83,400) |  |  |  |  |  |  |  |  |  |  |  |  |
Infrastructure project [Member] | Autop terrassa manresa SA [Member] | Final maturity in 2035 [Member] | Spanish toll roads [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  | 551,700 |  |  |  |  |  |  |  |  |  |  |  |  |
Infrastructure project [Member] | Autop terrassa manresa SA [Member] | Tranche a member [Member] | Spanish toll roads [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bank borrowings |  |  | 264,900 |  |  |  |  |  |  |  |  |  |  |  |  |
Infrastructure project [Member] | Autop terrassa manresa SA [Member] | Tranche b member [Member] | Spanish toll roads [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bank borrowings |  |  | 280,300 |  |  |  |  |  |  |  |  |  |  |  |  |
Infrastructure project [Member] | Autop terrassa manresa SA [Member] | Tranche c member [Member] | Spanish toll roads [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bank borrowings |  |  | € 39,700 |  |  |  |  |  |  |  |  |  |  |  |  |
Infrastructure project [Member] | Autop terrassa manresa SA [Member] | Floating interest rate [member] | Tranche a member [Member] | Spanish toll roads [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  | 367.20% |  |  |  |  |  |  | 367.20% |  |  |  |  |  |
Infrastructure project [Member] | Autop terrassa manresa SA [Member] | Floating interest rate [member] | Tranche b member [Member] | Spanish toll roads [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  | 150.00% |  |  |  |  |  |  | 150.00% |  |  |  |  |  |
Infrastructure project [Member] | Autop terrassa manresa SA [Member] | Floating interest rate [member] | Tranche c member [Member] | Spanish toll roads [Member] | Bottom of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  | 1.50% |  |  |  |  |  |  | 1.50% |  |  |  |  |  |
Infrastructure project [Member] | Autop terrassa manresa SA [Member] | Floating interest rate [member] | Tranche c member [Member] | Spanish toll roads [Member] | Top of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  | 367.20% |  |  |  |  |  |  | 367.20% |  |  |  |  |  |
Infrastructure project [Member] | Other european concession [Member] | Euro commercial paper [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash and cash equivalents |  |  |  | 31,000 |  |  |  |  |  |  |  |  |  |  |  |
Infrastructure project [Member] | Other european concession [Member] | Aragon toll road [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash and cash equivalents |  |  |  | 17,000 |  |  |  |  |  |  |  |  |  |  |  |
Infrastructure project [Member] | Other european concession [Member] | Treatment plants in the united kingdom [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash and cash equivalents |  |  |  | 14,000 |  |  |  |  |  |  |  |  |  |  |  |
Exinfrastructure project [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash and cash equivalents |  |  | € 22,000 | 37,000 |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  |  | 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  | 2,865,000 | 3,437,000 |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  | 2,886,000 | 3,463,000 |  |  |  |  |  |  |  |  |  |  |  |
Borrowings excluding infrastructure project companies |  |  | 2,889,000 | 3,449,000 |  |  |  |  |  |  |  |  |  |  |  |
Increase decrease in consolidated debt ECPs issued |  |  | (251,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Exinfrastructure project [Member] | Not later than one year [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  | 1,001,000 | 821,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Exinfrastructure project [Member] | At fair value [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings excluding infrastructure project companies |  |  | 2,866,000 | 3,394,000 |  |  |  |  |  |  |  |  |  |  |  |
Exinfrastructure project [Member] | Carrying amount [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings excluding infrastructure project companies |  |  | 2,889,000 | 3,449,000 |  |  |  |  |  |  |  |  |  |  |  |
Exinfrastructure project [Member] | Corporate debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  | 2,839,000 | 3,391,000 |  |  |  |  |  |  |  |  |  |  |  |
Credit drawable |  |  | 538,000 | 650,000 |  |  |  |  |  |  |  |  |  |  |  |
Credit limit |  |  | 3,377,000 | 4,041,000 |  |  |  |  |  |  |  |  |  |  |  |
Credit utilized |  |  | 2,839,000 | 3,391,000 |  |  |  |  |  |  |  |  |  |  |  |
Consolidated debt |  |  | 2,852,000 | 3,386,000 |  |  |  |  |  |  |  |  |  |  |  |
Total liquidity |  |  | 5,320,000 | 5,387,000 |  |  |  |  |  |  |  |  |  |  |  |
Exinfrastructure project [Member] | Corporate debt [Member] | Not later than one year [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  | 999,000 | 800,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Exinfrastructure project [Member] | Corporate debt [Member] | At fair value [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings excluding infrastructure project companies |  |  | 2,830,000 | 3,331,000 |  |  |  |  |  |  |  |  |  |  |  |
Exinfrastructure project [Member] | Corporate debt [Member] | Carrying amount [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings excluding infrastructure project companies |  |  | 2,852,000 | 3,386,000 |  |  |  |  |  |  |  |  |  |  |  |
Exinfrastructure project [Member] | Euro commercial paper [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings excluding infrastructure project companies |  |  | € 249,000 | 500,000 |  |  |  |  |  |  |  |  |  |  |  |
Reduction issued due to the variation of the EURO Commercial Paper |  |  |  | € (251,000) |  |  |  |  |  |  |  |  |  |  |  |
Percentage of average cost |  |  | 3.17% | 4.09% |  |  |  |  |  | 3.17% | 4.09% | 4.09% |  |  |  |
Average rate of outstanding bonds |  |  | 3.74% | 3.13% |  |  |  |  |  |  |  |  |  |  |  |
Exinfrastructure project [Member] | Corporate bonds and debentures [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings excluding infrastructure project companies |  |  | € 2,292,000 | € 2,590,000 |  |  |  |  |  |  |  |  |  |  |  |
Exinfrastructure project [Member] | Corporate bonds and debentures [Member] | Corporate debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit limit |  |  | 788,000 |  |  |  |  |  |  |  |  |  |  |  |  | € 1,100
Credit utilized |  |  | 250,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated debt | € 60,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average rate related to ferrovial loans | 0.425% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exinfrastructure project [Member] | Corporate bonds and debentures [Member] | Corporate debt [Member] | Bottom of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase decrease in consolidated debt ECPs issued |  |  |  | (534,000) |  |  |  |  |  |  |  |  |  |  |  |
Increase decrease in consolidated debt |  |  | (251,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Exinfrastructure project [Member] | Corporate bonds and debentures [Member] | Corporate debt [Member] | Cross currency swaps [Member] | At fair value [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  | 1,490 |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative financial liabilities |  |  |  | (13,000) |  |  |  |  |  |  |  |  |  |  |  |
Exinfrastructure project [Member] | Other borrowings [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings excluding infrastructure project companies |  |  | 36,000 | 63,000 |  |  |  |  |  |  |  |  |  |  |  |
Exinfrastructure project [Member] | Other borrowings [Member] | Not later than one year [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase decrease in consolidated debt ECPs issued |  | € 249,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exinfrastructure project [Member] | Construction division [Member] | Corporate debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit drawable |  |  | 114,000 | 137,000 |  |  |  |  |  |  |  |  |  |  |  |
Credit limit |  |  | 131,000 | 163,000 |  |  |  |  |  |  |  |  |  |  |  |
Credit utilized |  |  | 17,000 | 26,000 |  |  |  |  |  |  |  |  |  |  |  |
Consolidated debt |  |  | € 14,000 | 13,000 |  |  |  |  |  |  |  |  |  |  |  |
Exinfrastructure project [Member] | Sustainability Target Euro-commercial [Member] | Euro commercial paper [Member] | Corporate debt [Member] | July [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Detail of information about cash and cash equivalents and borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issued capital |  |  |  | € 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |

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