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Employee benefit plans - Narrative (Details) - EUR (€) € in Millions	Dec. 31, 2024	Dec. 31, 2023
Employee benefits [Abstract]
Non-current provisions for employee benefits	€ 4	€ 3

X

- Definition

Employee benefits

+ References

No definition available.

+ Details

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Namespace Prefix:	fer_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of non-current provisions for employee benefits. [Refer: Provisions for employee benefits]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 78
-Subparagraph d
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_78_d&doctype=Standard
-URIDate 2024-03-27

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant