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Short-term trade and other payables about other non trade payables - Narrative (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of short term trade and other payables [Line Items]    
Increase decrease in trade and other current payables other € 198 € 195
Payments to suppliers for goods and services 130  
Construction division [Member] | POLAND | Sydney Metro [Member]    
Disclosure of short term trade and other payables [Line Items]    
Increase decrease in trade and other current payables 59  
Energy Division [Member] | SPAIN    
Disclosure of short term trade and other payables [Line Items]    
Increase decrease in trade and other current payables 24  
Trade payables [Member]    
Disclosure of short term trade and other payables [Line Items]    
Increase decrease in trade and other current payables   84
Increase decrease in trade and other current payables other 53 24
Trade payables [Member] | Trade payables sent for reverse factoring [Member]    
Disclosure of short term trade and other payables [Line Items]    
Increase decrease in trade and other current payables other 35 48
Trade payables [Member] | Energy Division [Member]    
Disclosure of short term trade and other payables [Line Items]    
Increase decrease in trade and other current payables 23  
Work certified in advance [Member]    
Disclosure of short term trade and other payables [Line Items]    
Increase decrease in trade and other current payables other 77 165
Advance payments [Member]    
Disclosure of short term trade and other payables [Line Items]    
Increase decrease in trade and other current payables other € (14) € (1)