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

X

- 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

X

- 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