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Investments in associates and joint ventures (Details) | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024
Banco Rci Brasil Sa Current Company Name Of Rci Brasil Leasing [Member] | Jointly Controlled By Banco Santander [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Name of joint venture | Banco RCI Brasil S.A. |
Activity | Bank |
Country | Brasil |
Equity interest | 39.89% | 39.89%
Estruturadora Brasileira De Projetos S A [Member] | Jointly Controlled By Banco Santander [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Name of joint venture | Estruturadora Brasileira de Projetos S.A. - EBP |
Activity | Other Activities |
Country | Brasil |
Equity interest | 11.11% | 11.11%
Gestora De Inteligencia De Credito [Member] | Jointly Controlled By Banco Santander [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Name of joint venture | Gestora de Inteligência de Crédito |
Activity | Credit Bureau |
Country | Brasil |
Equity interest | 15.56% | 15.56%
Hyundai Corretora De Seguros [Member] | Jointly Controlled By Santander Sa Servios Tcnicos Administrativos De Corretagem De Seguros Santander Servios [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Name of joint venture | Hyundai Corretora de Seguros |
Activity | Insurance Brokerage |
Country | Brasil |
Equity interest | 50.00% | 50.00%
Loop Gestao De Patios S A [Member] | Subsidiary Of Webmotors S A [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Name of joint venture | Loop Gestão de Pátios S.A. (Loop) |
Activity | Services |
Country | Brasil |
Equity interest | 51.00% | 51.00%
Car 10 Tecnologiae Informacao S A [Member] | Subsidiary Of Webmotors S A [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Name of joint venture | Car10 Tecnologia e Informação S.A. (Car10) |
Activity | Technology |
Country | Brasil |
Equity interest | 66.67% | 66.67%
Pag 10 Fomento Mercantil Ltda [Member] | Subsidiary Of Car 10 Tecnologiae Informacao S A [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Name of joint venture | Pag10 Fomento Mercantil Ltda. |
Activity | Technology |
Country | Brasil |
Equity interest | 100.00% | 100.00%
Tbnet Comercio Locacaoe Administracao Ltda [Member] | Subsidiary Of Tecnologia Bancaria S A [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Name of joint venture | Tbnet Comércio, Locação e Administração Ltda. (Tbnet) |
Activity | Other Activities |
Country | Brasil |
Equity interest | 100.00% | 100.00%
Tec Ban Servicos Integrados Ltda [Member] | Subsidiary Of Tecnologia Bancaria S A [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Name of joint venture | TecBan Serviços Integrados Ltda. |
Activity | Other Activities |
Country | Brasil |
Equity interest | 100.00% | 100.00%
Tbforte Segurancae Transporte De Valores Ltda [Member] | Subsidiary Of Tbnet [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Name of joint venture | Tbforte Segurança e Transporte de Valores Ltda. (Tbforte) |
Activity | Other Activities |
Country | Brasil |
Equity interest | 100.00% | 100.00%
Nuclea S A [Member] | Significant Influence Of Banco Santander [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Name of joint venture | Núclea S.A. |
Activity | Other Activities |
Country | Brasil |
Equity interest | 17.53% | 17.53%
Pluxee Beneficios Brasil S A [Member] | Significant Influence Of Banco Santander [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Name of joint venture | Pluxee Beneficios Brasil S.A. |
Activity | Benefits |
Country | Brasil |
Equity interest | 20.00% | 20.00%
Santander Auto S A [Member] | Jointly Controlled By Banco Santander [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Name of joint venture | Santander Auto S.A. |
Activity | Other Activities |
Country | Brasil |
Equity interest | 50.00% | 50.00%
Tecnologia Bancaria S A T E C B A N [Member] | Significant Influence Of Santander Corretora De Seguros [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Name of joint venture | Tecnologia Bancária S.A. - TECBAN |
Activity | Other Activities |
Country | Brasil |
Equity interest | 18.98% | 18.98%
C S D Central De Servicos De Registre Deposito Aos Mercados Financeiroe De Capitais S A [Member] | Significant Influence Of Santander Corretora De Seguros [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Name of joint venture | CSD Central de Serviços de Registro e Depósito aos Mercados Financeiro e de Capitais S.A |
Activity | Other Activities |
Country | Brasil |
Equity interest | 18.35% | 20.00%
Biomas Servicos Ambientais Restauracaoe Carbono S A [Member] | Significant Influence Of Santander Corretora De Seguros [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Name of joint venture | Biomas - Serviços Ambientais, Restauração e Carbono S.A. |
Activity | Other Activities |
Country | Brasil |
Equity interest | 16.66% | 16.66%
Webmotors S A [Member] | Significant Influence Of Santander Corretora De Seguros [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Name of joint venture | Webmotors S.A. |
Activity | Other Activities |
Country | Brasil |
Equity interest | 30.00% | 30.00%

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