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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
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