v3.26.1
Investments - Summary of investments by company (Details) - EUR (€)
€ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of associates [line items]        
Associated entities € 5,096 € 5,216 € 5,682  
Joint venture entities 1,956 2,061 1,964  
INVESTMENTS 7,052 7,277 7,646 € 7,615
Santander Caceis Latam Holding 1, S.L        
Disclosure of associates [line items]        
Joint venture entities 404 381 389  
Santander Vida Seguros y Reaseguros, S.A.        
Disclosure of associates [line items]        
Joint venture entities 329 356 362  
U.C.I., S.A.        
Disclosure of associates [line items]        
Joint venture entities 293 325 349  
Fortune Auto Finance Co., Ltd        
Disclosure of associates [line items]        
Joint venture entities 232 261 254  
Hyundai Capital UK Limited        
Disclosure of associates [line items]        
Joint venture entities 270 249 205  
Volvo Car Financial Services UK Limited        
Disclosure of associates [line items]        
Joint venture entities 116 99 76  
Banco RCI Brasil S.A.        
Disclosure of associates [line items]        
Joint venture entities 77 94 92  
Other companies        
Disclosure of associates [line items]        
Joint venture entities 235 296 237  
Merlin Properties, SOCIMI, S.A.        
Disclosure of associates [line items]        
Associated entities 1,830 1,803 1,621  
Zurich Santander Insurance America, S.L. - Consolidated        
Disclosure of associates [line items]        
Associated entities 940 884 936  
Metrovacesa, S.A.        
Disclosure of associates [line items]        
Associated entities 748 841 899  
CNP Santander        
Disclosure of associates [line items]        
Associated entities 399 397 423  
Pluxee Beneficios Brasil, S.A.        
Disclosure of associates [line items]        
Associated entities 295 € 309 0  
Percentage of voting equity interests acquired   20.00%    
Caceis (Notes 3 and 12)        
Disclosure of associates [line items]        
Associated entities 0 € 0 1,139  
Other companies        
Disclosure of associates [line items]        
Associated entities € 884 € 982 € 664