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Inventories (Details) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disclosure of detailed information about inventories [Line Items]
Inventories	€ 492	€ 458	€ 476
Increase decrease in inventories exchange rate	13	5
Increase decrease ln inventories consolidation scope changes	0	0
Increase decrease ln inventories other	21	(23)
Goods purchase for resale [Member]
Disclosure of detailed information about inventories [Line Items]
Inventories	26	20	24
Increase decrease in inventories exchange rate	0	0
Increase decrease ln inventories consolidation scope changes	0	0
Increase decrease ln inventories other	6	(4)
Raw materials and other supplies [Member]
Disclosure of detailed information about inventories [Line Items]
Inventories	343	303	322
Increase decrease in inventories exchange rate	10	8
Increase decrease ln inventories consolidation scope changes	0	0
Increase decrease ln inventories other	30	(27)
Bidding and mobilization costs [Member]
Disclosure of detailed information about inventories [Line Items]
Inventories	124	135	€ 129
Increase decrease in inventories exchange rate	3	(2)
Increase decrease ln inventories consolidation scope changes	0	0
Increase decrease ln inventories other	€ (15)	€ 8

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The amount of assets: (a) held for sale in the ordinary course of business; (b) in the process of production for such sale; or (c) in the form of materials or supplies to be consumed in the production process or in the rendering of services. Inventories encompass goods purchased and held for resale including, for example, merchandise purchased by a retailer and held for resale, or land and other property held for resale. Inventories also encompass finished goods produced, or work in progress being produced, by the entity and include materials and supplies awaiting use in the production process. [Refer: Current finished goods; Current merchandise; Current work in progress; Land]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 54
-Subparagraph g
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_54_g&doctype=Standard
-URIDate 2024-03-27

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