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Non-current financial assets (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Sep. 30, 2024
Dec. 31, 2022
Disclosure of financial assets [line items]        
Other non current financial assets other than derivatives and infrastructure projects € 1,139 € 1,148 € 1,139 € 1,095
Increase decrease in non current financial assets additions 730 497    
Increase decrease in non current financial assets disposals (489) (423)    
Increase decrease in non current financial assets transfer and other (287) (12)    
Increase decrease in non current financial assets exchange rate 37 (9)    
Long term loans in associates [Member]        
Disclosure of financial assets [line items]        
Other non current financial assets other than derivatives and infrastructure projects   262 100 247
Increase decrease in non current financial assets additions 113 40    
Increase decrease in non current financial assets disposals (3) (37)    
Increase decrease in non current financial assets transfer and other (273) 0    
Increase decrease in non current financial assets exchange rate 1 12    
Restricted cash from infrastructure project companies and other financial assets [Member]        
Disclosure of financial assets [line items]        
Other non current financial assets other than derivatives and infrastructure projects   628 401 597
Increase decrease in non current financial assets additions 18 432    
Increase decrease in non current financial assets disposals (275) (381)    
Increase decrease in non current financial assets transfer and other 0    
Increase decrease in non current financial assets exchange rate 30 (20)    
Financial investment carried at fair value [Member]        
Disclosure of financial assets [line items]        
Other non current financial assets other than derivatives and infrastructure projects   45 610 35
Increase decrease in non current financial assets additions 566 9    
Increase decrease in non current financial assets disposals (2) 0    
Increase decrease in non current financial assets transfer and other (1) 1    
Increase decrease in non current financial assets exchange rate 2 0    
Loans associated with the divestment transactions [Member]        
Disclosure of financial assets [line items]        
Other non current financial assets other than derivatives and infrastructure projects   186 0 189
Increase decrease in non current financial assets additions 1 10    
Increase decrease in non current financial assets disposals (176) 0    
Increase decrease in non current financial assets transfer and other (13) (13)    
Increase decrease in non current financial assets exchange rate 2 0    
Other long term receivables [Member]        
Disclosure of financial assets [line items]        
Other non current financial assets other than derivatives and infrastructure projects   27 € 28 € 27
Increase decrease in non current financial assets additions 32 6    
Increase decrease in non current financial assets disposals (33) (5)    
Increase decrease in non current financial assets transfer and other 0 0    
Increase decrease in non current financial assets exchange rate € 2 € (1)