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Balances under contracts with customers and other ifrs 15 disclosures satisfield at year end table (Details) - EUR (€) € in Millions | Dec. 31, 2028 | Dec. 31, 2027 | Dec. 31, 2026 | Dec. 31, 2025 | Dec. 31, 2024
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DisclosureOfRevenue related to performanc obligations not satisfied at year end [Line Items] |  |  |  |  |
Revenue related to performance obligations not satisfied at year end |  |  |  |  | € 18,080
Construction division [Member] |  |  |  |  |
DisclosureOfRevenue related to performanc obligations not satisfied at year end [Line Items] |  |  |  |  |
Revenue related to performance obligations not satisfied at year end |  |  |  |  | 16,756
Energy infraestructure and Mobility [Member] |  |  |  |  |
DisclosureOfRevenue related to performanc obligations not satisfied at year end [Line Items] |  |  |  |  |
Revenue related to performance obligations not satisfied at year end |  |  |  |  | 1,324
Not later than one year [member] |  |  |  |  |
DisclosureOfRevenue related to performanc obligations not satisfied at year end [Line Items] |  |  |  |  |
Revenue related to performance obligations not satisfied at year end |  |  |  |  | 7,005
Not later than one year [member] | Construction division [Member] |  |  |  |  |
DisclosureOfRevenue related to performanc obligations not satisfied at year end [Line Items] |  |  |  |  |
Revenue related to performance obligations not satisfied at year end |  |  |  |  | 6,482
Not later than one year [member] | Energy infraestructure and Mobility [Member] |  |  |  |  |
DisclosureOfRevenue related to performanc obligations not satisfied at year end [Line Items] |  |  |  |  |
Revenue related to performance obligations not satisfied at year end |  |  |  |  | € 523
Later than one year and not later than two years [member] |  |  |  |  |
DisclosureOfRevenue related to performanc obligations not satisfied at year end [Line Items] |  |  |  |  |
Revenue related to performance obligations not satisfied at year end |  |  |  | € 5,502 |
Later than one year and not later than two years [member] | Construction division [Member] |  |  |  |  |
DisclosureOfRevenue related to performanc obligations not satisfied at year end [Line Items] |  |  |  |  |
Revenue related to performance obligations not satisfied at year end |  |  |  | 5,309 |
Later than one year and not later than two years [member] | Energy infraestructure and Mobility [Member] |  |  |  |  |
DisclosureOfRevenue related to performanc obligations not satisfied at year end [Line Items] |  |  |  |  |
Revenue related to performance obligations not satisfied at year end |  |  |  | € 193 |
Later than two years and not later than three years [member] |  |  |  |  |
DisclosureOfRevenue related to performanc obligations not satisfied at year end [Line Items] |  |  |  |  |
Revenue related to performance obligations not satisfied at year end |  |  | € 2,634 |  |
Later than two years and not later than three years [member] | Construction division [Member] |  |  |  |  |
DisclosureOfRevenue related to performanc obligations not satisfied at year end [Line Items] |  |  |  |  |
Revenue related to performance obligations not satisfied at year end |  |  | 2,521 |  |
Later than two years and not later than three years [member] | Energy infraestructure and Mobility [Member] |  |  |  |  |
DisclosureOfRevenue related to performanc obligations not satisfied at year end [Line Items] |  |  |  |  |
Revenue related to performance obligations not satisfied at year end |  |  | € 113 |  |
Later than three years and not later than four years [member] |  |  |  |  |
DisclosureOfRevenue related to performanc obligations not satisfied at year end [Line Items] |  |  |  |  |
Revenue related to performance obligations not satisfied at year end |  | € 784 |  |  |
Later than three years and not later than four years [member] | Construction division [Member] |  |  |  |  |
DisclosureOfRevenue related to performanc obligations not satisfied at year end [Line Items] |  |  |  |  |
Revenue related to performance obligations not satisfied at year end |  | 683 |  |  |
Later than three years and not later than four years [member] | Energy infraestructure and Mobility [Member] |  |  |  |  |
DisclosureOfRevenue related to performanc obligations not satisfied at year end [Line Items] |  |  |  |  |
Revenue related to performance obligations not satisfied at year end |  | € 101 |  |  |
Later than four years [Member] |  |  |  |  |
DisclosureOfRevenue related to performanc obligations not satisfied at year end [Line Items] |  |  |  |  |
Revenue related to performance obligations not satisfied at year end | € 2,154 |  |  |  |
Later than four years [Member] | Construction division [Member] |  |  |  |  |
DisclosureOfRevenue related to performanc obligations not satisfied at year end [Line Items] |  |  |  |  |
Revenue related to performance obligations not satisfied at year end | 1,760 |  |  |  |
Later than four years [Member] | Energy infraestructure and Mobility [Member] |  |  |  |  |
DisclosureOfRevenue related to performanc obligations not satisfied at year end [Line Items] |  |  |  |  |
Revenue related to performance obligations not satisfied at year end | € 394 |  |  |  |

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