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Operating income (Details) - EUR (€) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of detailed information about revenue by segment [Line Items] |  |  |  |
Revenue | € 9,147,000,000 | € 9,147,000,000 | € 8,514,000,000 | € 7,551,000,000
Variation of revenue by segment | 7.00% |  | 13.00% |
External sales [Member] |  |  |  |
Disclosure of detailed information about revenue by segment [Line Items] |  |  |  |
Revenue | € 8,864,000,000 |  | € 8,101,000,000 | 6,600,000,000
Intersegment sales [Member] |  |  |  |
Disclosure of detailed information about revenue by segment [Line Items] |  |  |  |
Revenue | 283,000,000 |  | 413,000,000 | 951,000,000
Construction division [Member] |  |  |  |
Disclosure of detailed information about revenue by segment [Line Items] |  |  |  |
Revenue | € 7,234,000,000 | 7,234,000,000 | € 6,869,000,000 | 6,280,000,000
Variation of revenue by segment | 5.00% |  | 9.00% |
Construction division [Member] | External sales [Member] |  |  |  |
Disclosure of detailed information about revenue by segment [Line Items] |  |  |  |
Revenue | € 6,919,000,000 |  | € 6,380,000,000 | 5,249,000,000
Construction division [Member] | Intersegment sales [Member] |  |  |  |
Disclosure of detailed information about revenue by segment [Line Items] |  |  |  |
Revenue | 315,000,000 |  | 489,000,000 | 1,031,000,000
Toll roads division [Member] |  |  |  |
Disclosure of detailed information about revenue by segment [Line Items] |  |  |  |
Revenue | € 1,256,000,000 | € 1,256,000,000 | € 1,085,000,000 | 780,000,000
Variation of revenue by segment | 16.00% |  | 39.00% |
Toll roads division [Member] | External sales [Member] |  |  |  |
Disclosure of detailed information about revenue by segment [Line Items] |  |  |  |
Revenue | € 1,246,000,000 |  | € 1,084,000,000 | 779,000,000
Toll roads division [Member] | Intersegment sales [Member] |  |  |  |
Disclosure of detailed information about revenue by segment [Line Items] |  |  |  |
Revenue | 10,000,000 |  | 1,000,000 | 1,000,000
Airports division [Member] |  |  |  |
Disclosure of detailed information about revenue by segment [Line Items] |  |  |  |
Revenue | € 91,000,000 |  | € 80,000,000 | 54,000,000
Variation of revenue by segment | 14.00% |  | 48.00% |
Airports division [Member] | External sales [Member] |  |  |  |
Disclosure of detailed information about revenue by segment [Line Items] |  |  |  |
Revenue | € 82,000,000 |  | € 80,000,000 | 54,000,000
Airports division [Member] | Intersegment sales [Member] |  |  |  |
Disclosure of detailed information about revenue by segment [Line Items] |  |  |  |
Revenue | 9,000,000 |  | 0 | 0
Energy and mobility infrastructures division [Member] |  |  |  |
Disclosure of detailed information about revenue by segment [Line Items] |  |  |  |
Revenue | € 270,000,000 |  | € 207,000,000 | 191,000,000
Variation of revenue by segment | 30.00% |  | 8.00% |
Energy and mobility infrastructures division [Member] | External sales [Member] |  |  |  |
Disclosure of detailed information about revenue by segment [Line Items] |  |  |  |
Revenue | € 268,000,000 |  | € 207,000,000 | 191,000,000
Energy and mobility infrastructures division [Member] | Intersegment sales [Member] |  |  |  |
Disclosure of detailed information about revenue by segment [Line Items] |  |  |  |
Revenue | 2,000,000 |  | 0 | 0
Corporation division [Member] |  |  |  |
Disclosure of detailed information about revenue by segment [Line Items] |  |  |  |
Revenue | € 520,000,000 |  | € 506,000,000 | 466,000,000
Variation of revenue by segment | 3.00% |  | 9.00% |
Corporation division [Member] | External sales [Member] |  |  |  |
Disclosure of detailed information about revenue by segment [Line Items] |  |  |  |
Revenue | € 348,000,000 |  | € 350,000,000 | 327,000,000
Corporation division [Member] | Intersegment sales [Member] |  |  |  |
Disclosure of detailed information about revenue by segment [Line Items] |  |  |  |
Revenue | 172,000,000 |  | 156,000,000 | 139,000,000
Revenue adjustments [Member] |  |  |  |
Disclosure of detailed information about revenue by segment [Line Items] |  |  |  |
Revenue | € (224,000,000) |  | € (233,000,000) | (220,000,000)
Variation of revenue by segment | (4.00%) |  | 6.00% |
Revenue adjustments [Member] | External sales [Member] |  |  |  |
Disclosure of detailed information about revenue by segment [Line Items] |  |  |  |
Revenue | € 0 |  | € 0 | 0
Revenue adjustments [Member] | Intersegment sales [Member] |  |  |  |
Disclosure of detailed information about revenue by segment [Line Items] |  |  |  |
Revenue | € (224,000,000) |  | € (233,000,000) | € (220,000,000)

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