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Exchange Rate of average - Narrative (Details) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Foreign exchange rates impact [Line Items] |  |
Currency translation differences | € 139 | € (125)
Equity attributable to owners of parent [member] |  |
Foreign exchange rates impact [Line Items] |  |
Currency translation differences | € (33) | € (83)

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Period Type: | duration

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- Definition Foreign exchange rates impact + References No definition available. + Details
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Namespace Prefix: | fer_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |