v3.26.1
TRADING ASSETS AND LIABILITIES - Investments in equity securities at fair value (Details) - COP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of financial assets [line items]    
Financial assets $ 305,457,293 $ 304,853,883
Financial assets at fair value through profit or loss, category [member]    
Disclosure of financial assets [line items]    
Financial assets 31,969,586 24,400,493
Trading securities [member]    
Disclosure of financial assets [line items]    
Financial assets 29,097,591 20,163,214
Trading securities [member] | Held for trading    
Disclosure of financial assets [line items]    
Financial assets 29,097,591 20,163,214
Private real estate equity fund Nexus    
Disclosure of financial assets [line items]    
Financial assets at fair value through profit or loss classified as held equity securities $ 3,717,262 2,772,165
Pension and severance funds    
Disclosure of financial assets [line items]    
Percentage of total assets of funds to be invested in mandatory severance and pension funds 1.00%  
Concesionaria Nueva Via al Mar    
Disclosure of financial assets [line items]    
Financial assets at fair value through profit or loss classified as held equity securities $ 1,060,638  
Concesionaria Vial del Pacfico    
Disclosure of financial assets [line items]    
Financial assets at fair value through profit or loss classified as held equity securities 1,768  
Concesionaria Vial del Oriente    
Disclosure of financial assets [line items]    
Financial assets at fair value through profit or loss classified as held equity securities 209,664  
Trading equity securities [member] | Financial assets at fair value through profit or loss, category [member] | Colombia, Pesos    
Disclosure of financial assets [line items]    
Financial assets 9,296,955 7,152,169
Trading equity securities [member] | Trading securities [member]    
Disclosure of financial assets [line items]    
Financial assets 9,297,726 7,256,506
Trading equity securities [member] | Trading securities [member] | Held for trading    
Disclosure of financial assets [line items]    
Financial assets 9,297,726 7,256,506
Trading equity securities [member] | Trading securities [member] | Held for trading | Foreign currency    
Disclosure of financial assets [line items]    
Financial assets 771 104,337
Trading equity securities [member] | Corporate stock | Held for trading | Colombia, Pesos    
Disclosure of financial assets [line items]    
Financial assets 15,284 13,453
Trading equity securities [member] | Corporate stock | Held for trading | Foreign currency    
Disclosure of financial assets [line items]    
Financial assets   4,813
Trading equity securities [member] | Investment funds [member] | Held for trading | Colombia, Pesos    
Disclosure of financial assets [line items]    
Financial assets 6,600,357 4,757,848
Trading equity securities [member] | Investment funds [member] | Held for trading | Foreign currency    
Disclosure of financial assets [line items]    
Financial assets 771 99,524
Trading equity securities [member] | Stabilization reserves | Held for trading | Colombia, Pesos    
Disclosure of financial assets [line items]    
Financial assets 2,669,785 $ 2,380,868
Trading equity securities [member] | Fiduciary assignments | Held for trading | Colombia, Pesos    
Disclosure of financial assets [line items]    
Financial assets $ 11,529