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Right-of-use assets and associated lease liabilities - Narrativo (Details) - EUR (€)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Detail information about right of use and associated liabilities [Line Items]      
Carry out several phases of a project for periods of less than a year or are considered to have low value € 5,000    
Disposals due to payments lease liabilities (104,000,000) € (87,000,000)  
Additions to right-of-use assets 143,000,000 87,000,000  
Miscellaneous other operating expense 4,931,000,000 4,878,000,000 € 4,182,000,000
Leases expenses [Member]      
Detail information about right of use and associated liabilities [Line Items]      
Miscellaneous other operating expense 257,000,000 251,000,000 € 257,000,000
Construction division [Member]      
Detail information about right of use and associated liabilities [Line Items]      
Additions to right-of-use assets € 109,000,000 € 72,000,000