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Property, plant and equipment by business division (Details) - Gross carrying amount [member] - EUR (€)
€ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about property, plant and equipment [line items]      
Additions other than through business combinations, property, plant and equipment € 318 € 318 € 215
Construction division [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Additions other than through business combinations, property, plant and equipment   117 103
Energy and mobility infrastructures division [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Additions other than through business combinations, property, plant and equipment   107 102
Corporation division [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Additions other than through business combinations, property, plant and equipment   € 94 € 10