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Capital and financing structure - Narrative (Details) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Infrastructure project [Member]
Capital and financing structure [Line Items]
Increase decrease net draw downs borrowings of infrastructure projects	€ 34
Increase decrease exchange rate effects borrowings of infrastructure projects	472
Bonds issued	(5,199)	€ (4,442)
Exinfrastructure project [Member]
Capital and financing structure [Line Items]
Increase decrease net draw downs borrowings of infrastructure projects	(580)
Increase decrease exchange rate effects borrowings of infrastructure projects	4
Bonds issued	(300)
Increase decrease in consolidated debt ECPs issued	€ (251)

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The amount of bonds issued by the entity.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 112
-Subparagraph c
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-URIDate 2024-03-27

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