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Other long-term payables (Details) - EUR (€) € in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Other long term payables [Abstract] |  |
Other non-current financial liabilities | € 1,279 | € 1,310

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- Definition Other long term payables + References No definition available. + Details
Name: | fer_OtherLongTermPayablesAbstract
Namespace Prefix: | fer_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of non-current payables that the entity does not separately disclose in the same statement or note. + 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
Name: | ifrs-full_OtherNoncurrentPayables
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant