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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

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