v3.26.1
Additional disclosure requirements - Condensed Balance Sheets (Details) - EUR (€)
€ in Millions
Jun. 30, 2026
Dec. 31, 2025
Jun. 30, 2025
Dec. 31, 2024
Assets        
Cash and due from banks € 119,102   € 158,978  
Trading account assets 286,941 € 252,318    
Premises and equipment, net 25,515 26,416    
Other assets 11,798 8,719    
TOTAL ASSETS 1,954,465 1,867,515    
Liabilities        
Other liabilities 15,182 15,937    
TOTAL LIABILITIES 1,838,567 1,754,767    
Stockholders' equity        
Capital stock 7,345 7,345    
TOTAL EQUITY 115,898 112,748 € 108,985 € 107,327
TOTAL LIABILITIES AND EQUITY 1,954,465 1,867,515    
Banco Santander S.A. | Reportable legal entities        
Assets        
Cash and due from banks 126,198 144,292    
Trading account assets 184,891 154,939    
Investment securities 109,138 91,217    
Investment in affiliated companies 101,780 98,317    
Premises and equipment, net 5,728 5,825    
Other assets 14,790 18,941    
TOTAL ASSETS 897,138 836,784    
Liabilities        
Deposits 419,537 415,898    
Short-term debt 172,032 129,462    
Long-term debt 118,829 114,756    
Total debt 290,860 244,218    
Other liabilities 101,657 94,325    
TOTAL LIABILITIES 812,055 754,441    
Stockholders' equity        
Capital stock 7,345 7,345    
Retained earnings and other reserves 77,739 74,998    
TOTAL EQUITY 85,084 82,343    
TOTAL LIABILITIES AND EQUITY 897,138 836,784    
Banco Santander S.A. | Reportable legal entities | Loans and Leases        
Assets        
Financial assets 354,613 323,253    
Bank subsidiaries | Banco Santander S.A. | Reportable legal entities        
Assets        
Cash and due from banks 14,622 11,517    
Investment securities 12,994 13,607    
Investment in affiliated companies 74,510 71,796    
Liabilities        
Deposits 10,856 8,773    
Total debt 6,281 3,994    
Non-bank subsidiaries | Banco Santander S.A. | Reportable legal entities        
Assets        
Investment securities 1,639 1,697    
Investment in affiliated companies 27,270 26,521    
Liabilities        
Deposits 31,748 26,412    
Total debt 1,374 1,363    
Non-bank subsidiaries | Banco Santander S.A. | Reportable legal entities | Loans and Leases        
Assets        
Financial assets € 23,115 € 23,340