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Cash flow (Tables) | 12 Months Ended
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Dec. 31, 2024
Cash flow [Abstract] |
Disclosure of detailed information about cash flows [Table Text Block] |
(Million euro) |  | 2024 | 2023 | 2022
Cash flows from operating activities ex tax payments |  | 1,485 |  | 1,433 |  | 1,084 |
Tax payments |  | (192) |  | (170) |  | (82) |
Cash flows from operating activities |  | 1,293 |  | 1,263 |  | 1,002 |
Investment |  | (1,269) |  | (468) |  | (1,161) |
Divestment |  | 2,582 |  | 43 |  | 429 |
Cash flows from investing activities |  | 1,313 |  | (425) |  | (732) |
Cash flows before financing activities |  | 2,606 |  | 838 |  | 270 |
Cash flows from financing activities |  | (2,567) |  | (1,179) |  | (676) |
Change in cash and cash equivalents |  | 39 |  | (341) |  | (406) |
2024-2022 (Million euro) | 2024 | 2023 | 2022 |
Cash flows from operating activities ex tax payments | — |  | — |  | 20 |  |
Tax payments | — |  | — |  | (1) |  |
Cash flows from operating activities | — |  | — |  | 19 |  |
Investment | — |  | — |  | (1) |  |
Divestment | — |  | — |  | — |  |
Cash flows before financing activities | — |  | — |  | 18 |  |

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- Definition Cash flow + 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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- Definition Disclosure of detailed information about cash flows + References No definition available. + Details
Name: | fer_DisclosureOfDetailedInformationAboutCashFlowsTableTextBlock
Namespace Prefix: | fer_
Data Type: | dtr-types1:textBlockItemType
Balance Type: | na
Period Type: | duration