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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
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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 The amount of investments in associates accounted for using the equity method. [Refer: Total for all associates [member]; Investments accounted for using equity method] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard -URIDate 2024-03-27 + Details
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