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Share of profits of equity-accounted companies (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Detailed information about investments accounted for using equity method [Line Items] |  |  |
Share of profit (loss) of associates accounted for using equity method | € 238 | € 215 | € 165
407 International Inc [Member] |  |  |
Detailed information about investments accounted for using equity method [Line Items] |  |  |
Share of profit (loss) of associates accounted for using equity method | 188 | 154 | 124
JFKNTO sponsor aggregator LLC [Member] |  |  |
Detailed information about investments accounted for using equity method [Line Items] |  |  |
Share of profit (loss) of associates accounted for using equity method | 3 | 4 | 1
IRB infrastructure developers limited [Member] |  |  |
Detailed information about investments accounted for using equity method [Line Items] |  |  |
Share of profit (loss) of associates accounted for using equity method | 13 | 14 | 22
Grupo Serveo, S.L. |  |  |
Detailed information about investments accounted for using equity method [Line Items] |  |  |
Share of profit (loss) of associates accounted for using equity method | 3 | 11 | 6
Other companies [Member] |  |  |
Detailed information about investments accounted for using equity method [Line Items] |  |  |
Share of profit (loss) of associates accounted for using equity method | € 31 | € 32 | € 12

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- Definition The entity's share of the profit (loss) of associates accounted for using the equity method. [Refer: Total for all associates [member]; Investments accounted for using equity method; Profit (loss)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 85 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_85&doctype=Standard -URIDate 2024-03-27 + Details
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