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Accounting Policies Construction Projects (Details) - EUR (€) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Construction projects item [Line Items] |  |  |  |
Revenue | € 9,147,000,000 | € 9,147,000,000 | € 8,514,000,000 | € 7,551,000,000
HS2 main works [Member] |  |  |  |
Construction projects item [Line Items] |  |  |  |
Percentage Share of Construction projects |  | 15.00% |  |
Revenue |  | € 332,000,000 |  |
Sydney metro west [Member] |  |  |  |
Construction projects item [Line Items] |  |  |  |
Percentage Share of Construction projects |  | 50.00% |  |
Revenue |  | € 233,000,000 |  |
Ontario transit group constructor GP [Member] |  |  |  |
Construction projects item [Line Items] |  |  |  |
Percentage Share of Construction projects |  | 50.00% |  |
Revenue |  | € 216,000,000 |  |
Riverlinx [Member] |  |  |  |
Construction projects item [Line Items] |  |  |  |
Percentage Share of Construction projects |  | 40.00% |  |
Revenue |  | € 127,000,000 |  |
Coffs Harbour Bypass [Member] |  |  |  |
Construction projects item [Line Items] |  |  |  |
Percentage Share of Construction projects |  | 50.00% |  |
Revenue |  | € 113,000,000 |  |
Thames Tideway Tunnel [Member] |  |  |  |
Construction projects item [Line Items] |  |  |  |
Percentage Share of Construction projects |  | 50.00% |  |
Revenue |  | € 60,000,000 |  |
Metro paris ligne 3JV [Member] |  |  |  |
Construction projects item [Line Items] |  |  |  |
Percentage Share of Construction projects |  | 50.00% |  |
Revenue |  | € 54,000,000 |  |
Linha Circular, A.C.E. [Member] |  |  |  |
Construction projects item [Line Items] |  |  |  |
Percentage Share of Construction projects |  | 65.00% |  |
Revenue |  | € 54,000,000 |  |
Construction projects total [Member] |  |  |  |
Construction projects item [Line Items] |  |  |  |
Revenue |  | € 1,187,000,000 |  |

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