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Short-term trade and other receivables current receivables (Details) - EUR (€) € in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Trade and other current receivables [abstract] |  |  |
Trade provisions | € 227 | € 216 | € 209
Amounts charged to the income statement of trade provisions | 10 | 5 |
Charges of trade provisions | 16 | 12 |
Reversals of trade provisions | (7) | (8) |
Applications for trade provisions | 0 | 0 |
Foreign exchange effect of trade provisions | 1 | 1 |
Transfers and other of trade provisions | € 0 | € 1 |

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- Definition Amounts charged to the income statement of trade provisions + References No definition available. + Details
Name: | fer_AmountsChargedToTheIncomeStatementOfTradeProvisions
Namespace Prefix: | fer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Applications for trade provisions + References No definition available. + Details
Name: | fer_ApplicationsForTradeProvisions
Namespace Prefix: | fer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Charges of trade provisions + References No definition available. + Details
Name: | fer_ChargesOfTradeProvisions
Namespace Prefix: | fer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Foreign exchange effect of trade provisions + References No definition available. + Details
Name: | fer_ForeignExchangeEffectOfTradeProvisions
Namespace Prefix: | fer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Reversals of trade provisions + References No definition available. + Details
Name: | fer_ReversalsOfTradeProvisions
Namespace Prefix: | fer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Trade provisions + References No definition available. + Details
Name: | fer_TradeProvisions
Namespace Prefix: | fer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Transfers and other of trade provisions + References No definition available. + Details
Name: | fer_TransfersAndOtherOfTradeProvisions
Namespace Prefix: | fer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | ifrs-full_TradeAndOtherCurrentReceivablesAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration