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Net financial income/(expense) from infrastructure project companies (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Finance income expense [Abstract] |  |  |
Accrued financial expenses from infrastructures projects | € (387) | € (379) | € (347)
Expenses capitalized during the construction period from infrastructure projects | 5 | 17 | 96
Financial expenses in profit loss from infrastructures projects | € (382) | € (362) | € (251)

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- Definition Accrued financial expenses from infrastructures projects + References No definition available. + Details
Name: | fer_AccruedFinancialExpensesFromInfrastructuresProjects
Namespace Prefix: | fer_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Expenses capitalized during the construction period from infrastructure projects + References No definition available. + Details
Name: | fer_ExpensesCapitalizedDuringTheConstructionPeriodFromInfrastructureProjects
Namespace Prefix: | fer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Finance income expense + References No definition available. + Details
Name: | fer_FinanceIncomeExpenseAbstract
Namespace Prefix: | fer_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Financial expenses in profit loss from infrastructures projects + References No definition available. + Details
Name: | fer_FinancialExpensesInProfitLossFromInfrastructuresProjects
Namespace Prefix: | fer_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration