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Inventories- Narrative (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 ln inventories other	21	(23)
Bidding cost [Member]
Disclosure of detailed information about inventories [Line Items]
Inventories amortization expense	15
Goods purchase for resale [Member]
Disclosure of detailed information about inventories [Line Items]
Inventories	26	20	24
Increase decrease ln inventories other	6	(4)
Goods purchase for resale [Member] | Construction division [Member]
Disclosure of detailed information about inventories [Line Items]
Inventories	26	19
Raw materials and other supplies [Member]
Disclosure of detailed information about inventories [Line Items]
Inventories	343	303	€ 322
Increase decrease ln inventories other	30	(27)
Raw materials and other supplies [Member] | Construction division [Member] | UNITED STATES
Disclosure of detailed information about inventories [Line Items]
Inventories	23	10
Raw materials and other supplies [Member] | Construction division [Member] | SPAIN
Disclosure of detailed information about inventories [Line Items]
Inventories	13	€ (1)
Raw materials and other supplies [Member] | Construction division [Member] | USA and Spain [Member]
Disclosure of detailed information about inventories [Line Items]
Inventories	€ 40

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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]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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-IssueDate 2024-01-01
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