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Cash and cash equivalents and borrowings (Details) - Exinfrastructure project [Member] - EUR (€)
€ in Millions
Dec. 31, 2024
Dec. 31, 2023
Short and long term borrowing ex infrastructure project [Line Items]    
Borrowings excluding infrastructure project companies € 2,889 € 3,449
Corporate bonds and debentures [Member]    
Short and long term borrowing ex infrastructure project [Line Items]    
Borrowings excluding infrastructure project companies 2,292 2,590
Euro commercial paper [Member]    
Short and long term borrowing ex infrastructure project [Line Items]    
Borrowings excluding infrastructure project companies 249 500
Corporate liquidity lines [Member]    
Short and long term borrowing ex infrastructure project [Line Items]    
Borrowings excluding infrastructure project companies 312 296
Other borrowings [Member]    
Short and long term borrowing ex infrastructure project [Line Items]    
Borrowings excluding infrastructure project companies 36 63
Long-term borrowings [member]    
Short and long term borrowing ex infrastructure project [Line Items]    
Borrowings excluding infrastructure project companies 1,836 2,571
Long-term borrowings [member] | Corporate bonds and debentures [Member]    
Short and long term borrowing ex infrastructure project [Line Items]    
Borrowings excluding infrastructure project companies 1,773 2,270
Long-term borrowings [member] | Euro commercial paper [Member]    
Short and long term borrowing ex infrastructure project [Line Items]    
Borrowings excluding infrastructure project companies 0 0
Long-term borrowings [member] | Corporate liquidity lines [Member]    
Short and long term borrowing ex infrastructure project [Line Items]    
Borrowings excluding infrastructure project companies 60 296
Long-term borrowings [member] | Other borrowings [Member]    
Short and long term borrowing ex infrastructure project [Line Items]    
Borrowings excluding infrastructure project companies 3 5
Short-term borrowings [member]    
Short and long term borrowing ex infrastructure project [Line Items]    
Borrowings excluding infrastructure project companies 1,052 879
Short-term borrowings [member] | Corporate bonds and debentures [Member]    
Short and long term borrowing ex infrastructure project [Line Items]    
Borrowings excluding infrastructure project companies 518 320
Short-term borrowings [member] | Euro commercial paper [Member]    
Short and long term borrowing ex infrastructure project [Line Items]    
Borrowings excluding infrastructure project companies 249 500
Short-term borrowings [member] | Corporate liquidity lines [Member]    
Short and long term borrowing ex infrastructure project [Line Items]    
Borrowings excluding infrastructure project companies 252 0
Short-term borrowings [member] | Other borrowings [Member]    
Short and long term borrowing ex infrastructure project [Line Items]    
Borrowings excluding infrastructure project companies € 33 € 58