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Investment in associates other companies (Details) - EUR (€) € in Millions	Dec. 31, 2024	Sep. 30, 2024	Dec. 31, 2023	Dec. 31, 2022
Other associates [Line Items]
Investments in associates accounted for using equity method	€ 3,023	€ 3,023	€ 2,038	€ 1,951
Other companies [Member]
Other associates [Line Items]
Investments in associates accounted for using equity method	220	€ 220	263	€ 276
Other companies [Member] | Riverlinx limited silvertown tunnel [Member]
Other associates [Line Items]
Investments in associates accounted for using equity method	65		52
Other companies [Member] | Concesionaria madrid calle 30 [Member]
Other associates [Line Items]
Investments in associates accounted for using equity method	56		52
Other companies [Member] | Netflow osars western gp [Member]
Other associates [Line Items]
Investments in associates accounted for using equity method	38		42
Other companies [Member] | Ruta del Cacao [Member]
Other associates [Line Items]
Investments in associates accounted for using equity method	27		22
Other companies [Member] | FMM Company LLC [Member]
Other associates [Line Items]
Investments in associates accounted for using equity method	18		19
Other companies [Member] | Other associates [Member]
Other associates [Line Items]
Investments in associates accounted for using equity method	€ 16		€ 76

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- Definition

Other associates

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No definition available.

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- Definition

The amount of investments in associates accounted for using the equity method. [Refer: Total for all associates [member]; Investments accounted for using equity method]

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 55
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-URIDate 2024-03-27

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