v3.26.1
Distribution of Banco Santander's profit, shareholder remuneration scheme and earnings per share - Narrative (Details)
€ / shares in Units, € in Millions
1 Months Ended 5 Months Ended 11 Months Ended 12 Months Ended
Feb. 24, 2026
€ / shares
Jan. 09, 2026
May 02, 2025
€ / shares
Apr. 04, 2025
EUR (€)
Nov. 30, 2025
€ / shares
Dec. 31, 2025
EUR (€)
Dec. 31, 2026
EUR (€)
Dec. 31, 2025
EUR (€)
program
Profit Distribution [Line Items]                
Share buyback program, percentage of underlying profit             25.00% 25.00%
Number of share buyback programs | program               2
Percentage of capital released of sale of Poland             50.00%  
Agreement For The Sale Of Santander Bank Polska S.A. | Santander Bank Polska S.A.                
Profit Distribution [Line Items]                
Sale of proportion of ownership interest in subsidiary   49.00%            
2024 Program, First                
Profit Distribution [Line Items]                
Share buyback program, amount       € 1,525        
2024 Program, Second                
Profit Distribution [Line Items]                
Share buyback program, amount       € 1,587        
2025 Program, First                
Profit Distribution [Line Items]                
Share buyback program, amount           € 1,700    
2025 Program, Second                
Profit Distribution [Line Items]                
Share buyback program, amount             € 5,030  
2025 And 2026 Program                
Profit Distribution [Line Items]                
Share buyback program, amount               € 10,000
2025 Program, Second, Capital Released Of Poland Sale                
Profit Distribution [Line Items]                
Share buyback program, amount             3,200  
2025 Program, Second, Group Underlying Profit                
Profit Distribution [Line Items]                
Share buyback program, amount             € 1,830  
Interim dividend                
Profit Distribution [Line Items]                
Dividends per share (in eur per share) | € / shares         € 0.115      
Complementary dividend                
Profit Distribution [Line Items]                
Dividends per share (in eur per share) | € / shares     € 0.11          
Dividends proposed, total per share (in eur per share) | € / shares € 0.125