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Cash and cash equivalents and borrowings exinfraestructure project (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
GrossInfrastructure and ex infrastructure project borrowings [Line Items]    
Borrowings € (11,288) € (11,378)
Exinfrastructure project [Member]    
GrossInfrastructure and ex infrastructure project borrowings [Line Items]    
Borrowings (2,886) (3,463)
Increase decrease with impact on cash flow borrowings (569)  
Foreign exchange effect borrowings 4  
Impact of consolidation scope changes and other borrowings 0  
Capitalized accrued interest borrowings (11)  
Infrastructure project [Member]    
GrossInfrastructure and ex infrastructure project borrowings [Line Items]    
Borrowings (8,400) (7,915)
Increase decrease with impact on cash flow borrowings 70  
Foreign exchange effect borrowings   472
Impact of consolidation scope changes and other borrowings (22)  
Capitalized accrued interest borrowings (36)  
Bank borrowings project bonds [Member] | Exinfrastructure project [Member]    
GrossInfrastructure and ex infrastructure project borrowings [Line Items]    
Borrowings (2,888) (3,449)
Increase decrease with impact on cash flow borrowings (569)  
Foreign exchange effect borrowings 19  
Impact of consolidation scope changes and other borrowings 0  
Capitalized accrued interest borrowings (11)  
Cross currency swaps [Member] | Exinfrastructure project [Member]    
GrossInfrastructure and ex infrastructure project borrowings [Line Items]    
Borrowings (2) € (13)
Increase decrease with impact on cash flow borrowings 0  
Foreign exchange effect borrowings (16)  
Impact of consolidation scope changes and other borrowings 0  
Capitalized accrued interest borrowings