v3.26.1
Non-current assets held for sale and liabilities associated with non-current assets held for sale - Schedule of non-current assets classified as held for sale (Details) - EUR (€)
€ in Millions
Jun. 30, 2026
Dec. 31, 2025
Assets And Liabilities Classified As Held For Sale [Line Items]    
Tangible assets € 26,480 € 27,438
Other assets 11,798 8,719
Total Assets associated with non-current assets held for sale 2,866 75,011
Total Liabilities associated with non-current assets held for sale 0 62,995
Assets and liabilities classified as held for sale    
Assets And Liabilities Classified As Held For Sale [Line Items]    
Tangible assets 2,857 2,850
Other assets 9 13
Total Assets associated with non-current assets held for sale 2,866 75,011
Total Liabilities associated with non-current assets held for sale 0 62,995
Assets and liabilities classified as held for sale | Foreclosed assets    
Assets And Liabilities Classified As Held For Sale [Line Items]    
Tangible assets 2,487 2,487
Assets and liabilities classified as held for sale | Other tangible assets held for sale    
Assets And Liabilities Classified As Held For Sale [Line Items]    
Tangible assets 370 363
Assets and liabilities classified as held for sale | Spain | Foreclosed assets    
Assets And Liabilities Classified As Held For Sale [Line Items]    
Tangible assets 1,643 1,705
Assets and liabilities classified as held for sale | Total for all subsidiaries    
Assets And Liabilities Classified As Held For Sale [Line Items]    
Total Assets associated with non-current assets held for sale 0 72,148
Assets and liabilities classified as held for sale | Santander Bank Polska SA    
Assets And Liabilities Classified As Held For Sale [Line Items]    
Total Assets associated with non-current assets held for sale 0 72,148
Total Liabilities associated with non-current assets held for sale € 0 € 62,995