v3.25.4
Transactions With Related Parties (Details) - Schedule of Business Operations of the Bank With their Clients
$ in Millions
12 Months Ended
Dec. 31, 2025
CLP ($)
Dec. 31, 2024
CLP ($)
Dec. 31, 2025
CLF
Dec. 31, 2025
USD ($)
Dec. 31, 2025
CLP ($)
Schedule of Business Operations of the Bank With their Clients [Line Items]          
Exceed amount     CLF 2,000 $ 77,289  
Expenses MCh$ $ 14,095 $ 33,385      
Banco Santander, S.A.| Spain| Group| Consulting Services| Monthly          
Schedule of Business Operations of the Bank With their Clients [Line Items]          
Income MCh$ 5 0      
Expenses MCh$ 19,095 21,898      
Account receivable 0 0      
Account payable MCh$   1,264     $ 656
Santander Back-Offices Globales Mayoristas, S.A.| Spain| Group| Consulting Services| Monthly          
Schedule of Business Operations of the Bank With their Clients [Line Items]          
Income MCh$ 0        
Expenses MCh$ 3,496        
Account receivable 0        
Account payable MCh$         0
Santander Chile Holding S.A.| Chile| Group| Consulting Services| Monthly          
Schedule of Business Operations of the Bank With their Clients [Line Items]          
Income MCh$ 233        
Expenses MCh$ 0        
Account receivable 4        
Account payable MCh$         0
Santander Factoring S.A.| Chile| Group| Consulting Services| Monthly          
Schedule of Business Operations of the Bank With their Clients [Line Items]          
Income MCh$ 39        
Expenses MCh$ 395        
Account receivable 20        
Account payable MCh$         66
Bansa Santander S.A.| Chile| Group| Consulting Services| Monthly          
Schedule of Business Operations of the Bank With their Clients [Line Items]          
Income MCh$ 4        
Expenses MCh$ 87        
Account receivable 0        
Account payable MCh$         0
Gesban Santander Servicios Profesionales Contables Limitada| Chile| Group| Consulting Services| Monthly          
Schedule of Business Operations of the Bank With their Clients [Line Items]          
Income MCh$ 60        
Account receivable 0        
Account payable MCh$         134
Other income (118)        
Santander Global Services, S.L.| Spain| Group| Consulting Services| Monthly          
Schedule of Business Operations of the Bank With their Clients [Line Items]          
Income MCh$ 0        
Expenses MCh$ 609        
Account receivable 0        
Account payable MCh$         0
Santander Investment Chile Limitada| Chile| Group| Consulting Services| Monthly          
Schedule of Business Operations of the Bank With their Clients [Line Items]          
Income MCh$ 0        
Expenses MCh$ 5,141        
Account receivable 12        
Account payable MCh$         336
Santander Global Technology and Operations Chile limitada| Chile| Consulting Services| IT Services| Monthly          
Schedule of Business Operations of the Bank With their Clients [Line Items]          
Income MCh$ 178        
Expenses MCh$ 7,637        
Account receivable 2        
Account payable MCh$         9,088
Universia Chile S.A.| Chile| Group| Institutional Consulting Services| Monthly [Member]          
Schedule of Business Operations of the Bank With their Clients [Line Items]          
Income MCh$ 8        
Expenses MCh$ 446        
Account receivable 0        
Account payable MCh$         0
Aquanima Chile S.A.| Chile| Group| Consulting Services| Monthly [Member]          
Schedule of Business Operations of the Bank With their Clients [Line Items]          
Income MCh$ 0        
Expenses MCh$ 1,067        
Account receivable 0        
Account payable MCh$         0
Santander Asset Management S.A. Administradora General de Fondos| Chile| Group| Consulting Services| Mon[Member]          
Schedule of Business Operations of the Bank With their Clients [Line Items]          
Income MCh$ 693        
Expenses MCh$ 85        
Account receivable 9,976        
Account payable MCh$         21
Centro de Compensación Automatizado S.A.| Chile| Associated| Consulting Services| Monthly          
Schedule of Business Operations of the Bank With their Clients [Line Items]          
Income MCh$ 0        
Expenses MCh$ 3,453        
Account receivable 0        
Account payable MCh$         0
Sociedad Operadora de la Cámara de Compensación de Pagos de Alto Valor S.A.| Chile| Associated| Consulting Services| Monthly          
Schedule of Business Operations of the Bank With their Clients [Line Items]          
Income MCh$ 0        
Expenses MCh$ 600        
Account receivable 0        
Account payable MCh$         0
Zurich Santander Seguros Generales Chile S.A.| Chile| Associated| Channel Consulting Services| Monthly          
Schedule of Business Operations of the Bank With their Clients [Line Items]          
Income MCh$ 122        
Expenses MCh$ 0        
Account receivable 1,452        
Account payable MCh$         0
Santander Banca de Inversión Colombia, S.A.S.| Colombia| Group| Consulting Services| Monthly          
Schedule of Business Operations of the Bank With their Clients [Line Items]          
Income MCh$ 0        
Expenses MCh$ 291        
Account receivable 0        
Account payable MCh$         0
F1rst Tecnologia e Inovação Ltda.| Brazil| Group| Consulting Services| Monthly [Member]          
Schedule of Business Operations of the Bank With their Clients [Line Items]          
Income MCh$ 0        
Expenses MCh$ 8,783        
Account receivable 0        
Account payable MCh$         0
Santander Global Technology and Operations, S.L. Unipersonal| Spain| Group| Consulting Services| Monthly          
Schedule of Business Operations of the Bank With their Clients [Line Items]          
Income MCh$ 0        
Expenses MCh$ 53,843        
Account receivable 0        
Account payable MCh$         0
PagoNxt Payments Services, S.L.| Spain| Group| Consulting Services| Monthly          
Schedule of Business Operations of the Bank With their Clients [Line Items]          
Income MCh$ 0        
Expenses MCh$ 751        
Account receivable 0        
Account payable MCh$         0
Santander Global Cards & Digital Solutions, S.L.| Spain| Group| Consulting Services| Monthly [Member]          
Schedule of Business Operations of the Bank With their Clients [Line Items]          
Income MCh$ 0        
Expenses MCh$ 2,316        
Account receivable 0        
Account payable MCh$         0
Open Digital Services, S.L.| Spain| Group| Consulting Services| Monthly          
Schedule of Business Operations of the Bank With their Clients [Line Items]          
Income MCh$ 0        
Expenses MCh$ 4,141        
Account receivable 0        
Account payable MCh$         0
Klare Corredora de Seguros S.A.| Chile| Group| Consulting Services| Monthly [Member]          
Schedule of Business Operations of the Bank With their Clients [Line Items]          
Income MCh$ 9        
Expenses MCh$ 274        
Account receivable $ 1        
Account payable MCh$         $ 0
Santander Back-Offices Globales Mayoristas, S.A.| Spain| Group| Back Office services| Monthly          
Schedule of Business Operations of the Bank With their Clients [Line Items]          
Income MCh$   0      
Expenses MCh$   3,554      
Account receivable   0      
Account payable MCh$   0      
Santander Chile Holding S.A.| Chile| Group| Leases| Monthly          
Schedule of Business Operations of the Bank With their Clients [Line Items]          
Income MCh$   266      
Expenses MCh$   0      
Account receivable   1      
Account payable MCh$   0      
Santander Factoring S.A.| Chile| Group| Leases, Custody and Portal| Monthly          
Schedule of Business Operations of the Bank With their Clients [Line Items]          
Income MCh$   44      
Expenses MCh$   412      
Account receivable   20      
Account payable MCh$   103      
Bansa Santander S.A.| Chile| Group| Leases and Other| Monthly          
Schedule of Business Operations of the Bank With their Clients [Line Items]          
Income MCh$   4      
Expenses MCh$   83      
Account receivable   0      
Account payable MCh$   0      
Gesban Santander Servicios Profesionales Contables Limitada| Chile| Group| Accounting Services| Monthly          
Schedule of Business Operations of the Bank With their Clients [Line Items]          
Income MCh$   57      
Expenses MCh$   762      
Account receivable   0      
Account payable MCh$   0      
Santander Global Services, S.L. Unipersonal| Spain| Group| Consulting services| Monthly          
Schedule of Business Operations of the Bank With their Clients [Line Items]          
Income MCh$   0      
Expenses MCh$   643      
Account receivable   0      
Account payable MCh$   0      
Santander Investment Chile Limitada| Chile| Group| Leases| Monthly          
Schedule of Business Operations of the Bank With their Clients [Line Items]          
Income MCh$   0      
Expenses MCh$   4,925      
Account receivable   3      
Account payable MCh$   310      
Santander Global Technology and Operations Chile limitada| Chile| Group| IT Services| Monthly          
Schedule of Business Operations of the Bank With their Clients [Line Items]          
Income MCh$   0      
Expenses MCh$   372      
Account receivable   0      
Account payable MCh$   14      
Universia Chile S.A.| Chile| Group| Institutional Services| Monthly          
Schedule of Business Operations of the Bank With their Clients [Line Items]          
Income MCh$   7      
Expenses MCh$   435      
Account receivable   0      
Account payable MCh$   84      
Aquanima Chile S.A.| Chile| Group| Procurement Services| Monthly          
Schedule of Business Operations of the Bank With their Clients [Line Items]          
Income MCh$   0      
Expenses MCh$   1,904      
Account receivable   0      
Account payable MCh$   351      
Santander Asset Management S.A. Administradora General de Fondos| Chile| Group| Leases and Other| Monthly          
Schedule of Business Operations of the Bank With their Clients [Line Items]          
Income MCh$   0      
Expenses MCh$   483      
Account receivable   9,335      
Account payable MCh$   81      
Centro de Compensación Automatizado S.A.| Chile| Associated| Derivatives clearing| Monthly          
Schedule of Business Operations of the Bank With their Clients [Line Items]          
Income MCh$   0      
Expenses MCh$   3,501      
Account receivable   0      
Account payable MCh$   0      
Sociedad Operadora de la Cámara de Compensación de Pagos de Alto Valor S.A.| Chile| Associated| Card operator| Monthly          
Schedule of Business Operations of the Bank With their Clients [Line Items]          
Income MCh$   0      
Expenses MCh$   733      
Account receivable   0      
Account payable MCh$   0      
Zurich Santander Seguros Generales Chile S.A.| Chile| Associated| Channel Usage Services| Monthly          
Schedule of Business Operations of the Bank With their Clients [Line Items]          
Income MCh$   187      
Expenses MCh$   0      
Account receivable   1,883      
Account payable MCh$   0      
F1rst Tecnologia e Inovação Ltda.| Brazil| Group| IT Services and Service Desk| Monthly          
Schedule of Business Operations of the Bank With their Clients [Line Items]          
Income MCh$   0      
Expenses MCh$   26,816      
Account receivable   0      
Account payable MCh$   0      
Santander Global Technology and Operations, S.L. Unipersonal| Spain| Group| IT services and Ops,| Monthly          
Schedule of Business Operations of the Bank With their Clients [Line Items]          
Income MCh$   0      
Expenses MCh$   57,379      
Account receivable   132      
Account payable MCh$   0      
PagoNxt Trade Services, S.L.| Spain| Group| Digital payments| Monthly          
Schedule of Business Operations of the Bank With their Clients [Line Items]          
Income MCh$   0      
Expenses MCh$   620      
Account receivable   0      
Account payable MCh$   0      
Klare Corredora de Seguros S.A.| Chile| Group| Leases| Monthly          
Schedule of Business Operations of the Bank With their Clients [Line Items]          
Income MCh$   78      
Expenses MCh$   0      
Account receivable   267      
Account payable MCh$   0      
Universia Holding, S.L.| Spain| Group| Institutional Services| Monthly          
Schedule of Business Operations of the Bank With their Clients [Line Items]          
Income MCh$   0      
Expenses MCh$   77      
Account receivable   0      
Account payable MCh$   0      
Santander Global Cards & Digital Solutions, S.L.| Spain| Group| Institutional Services| Monthly          
Schedule of Business Operations of the Bank With their Clients [Line Items]          
Income MCh$   0      
Expenses MCh$   515      
Account receivable   0      
Account payable MCh$   $ 0