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Impairments and disposals (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Impairment and disposals items [Line Items]      
Impairment and disposals impact on profit loss before tax € 2,208 € 35 € (6)
Impairment and disposals impact on profit loss after tax 2,191 37 (6)
Capital gains and disposals [Member]      
Impairment and disposals items [Line Items]      
Impairment and disposals impact on profit loss before tax 2,209 39 (3)
Impairment and disposals impact on profit loss after tax 2,192 41 (3)
Capital gains and disposals [Member] | IRB sale 5% [Member]      
Impairment and disposals items [Line Items]      
Impairment and disposals impact on profit loss before tax 132    
Impairment and disposals impact on profit loss after tax 116    
Capital gains and disposals [Member] | Serveo sale [Member]      
Impairment and disposals items [Line Items]      
Impairment and disposals impact on profit loss before tax 33    
Impairment and disposals impact on profit loss after tax 32    
Capital gains and disposals [Member] | Azores sale [Member]      
Impairment and disposals items [Line Items]      
Impairment and disposals impact on profit loss before tax   39  
Impairment and disposals impact on profit loss after tax   41  
Capital gains and disposals [Member] | Algarve sale [Member]      
Impairment and disposals items [Line Items]      
Impairment and disposals impact on profit loss before tax     (3)
Impairment and disposals impact on profit loss after tax     (3)
Capital gains and disposals [Member] | 19,75% HAH Sale [Member]      
Impairment and disposals items [Line Items]      
Impairment and disposals impact on profit loss before tax 2,023    
Impairment and disposals impact on profit loss after tax 2,023    
Capital gains and disposals [Member] | Vertiports sale [Member]      
Impairment and disposals items [Line Items]      
Impairment and disposals impact on profit loss before tax 2    
Impairment and disposals impact on profit loss after tax 2    
Capital gains and disposals [Member] | Equity-accounted availability toll road assets [Member]      
Impairment and disposals items [Line Items]      
Impairment and disposals impact on profit loss before tax 19    
Impairment and disposals impact on profit loss after tax 19    
Impairment gains losses axis [Member]      
Impairment and disposals items [Line Items]      
Impairment and disposals impact on profit loss before tax (1) (4) (3)
Impairment and disposals impact on profit loss after tax € (1) (4) (3)
Impairment gains losses axis [Member] | Impairment of the ownership interest in maaS global [Member]      
Impairment and disposals items [Line Items]      
Impairment and disposals impact on profit loss before tax     (3)
Impairment and disposals impact on profit loss after tax     € (3)
Impairment gains losses axis [Member] | Aravia [Member]      
Impairment and disposals items [Line Items]      
Impairment and disposals impact on profit loss before tax   (2)  
Impairment and disposals impact on profit loss after tax   (2)  
Impairment gains losses axis [Member] | Sale of zity ownership interest [Member]      
Impairment and disposals items [Line Items]      
Impairment and disposals impact on profit loss before tax   (2)  
Impairment and disposals impact on profit loss after tax   € (2)