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Property, plant and equipment - Narrative (Details) - EUR (€)
€ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Jan. 01, 2024
Jan. 01, 2023
Detail information about property plant and equipment [Line Items]          
Disposals, property, plant and equipment     € 63    
Property, plant and equipment € 772 € 772 594    
Assets classified as held for sale [Member]          
Detail information about property plant and equipment [Line Items]          
Property, plant and equipment   39      
Gross carrying amount [member]          
Detail information about property plant and equipment [Line Items]          
Additions other than through business combinations, property, plant and equipment 318 318 215    
Cash flows due to property plant and equipment additions   (282) (158)    
Disposals, property, plant and equipment   77 63    
Property, plant and equipment € 1,377   1,124 € 1,124 € 969
Construction division [Member]          
Detail information about property plant and equipment [Line Items]          
Disposals, property, plant and equipment   (64)      
Construction division [Member] | Gross carrying amount [member]          
Detail information about property plant and equipment [Line Items]          
Additions other than through business combinations, property, plant and equipment   117 103    
Disposals, property, plant and equipment     (52)    
Property, plant and equipment   144 191    
Energy and mobility infrastructures division [Member] | Gross carrying amount [member]          
Detail information about property plant and equipment [Line Items]          
Additions other than through business combinations, property, plant and equipment   € 107 € 102