v3.26.1
ESTIMATION OF FAIR VALUE - Trading assets in debt securities pledged as collateral (Details) - Financial assets at fair value through profit or loss, classified as held for trading, category, International Financial Reporting Standards 9 [member] - COP ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Debt securities [member]    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral $ 8,702,596 $ 6,452,275
Pledged in money market operations | Debt securities [member]    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral 7,130,536 5,272,055
Pledged in money market operations | Securities issued or secured by Colombian Government    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral 7,127,460 5,270,000
Pledged in money market operations | Securities issued or secured by other financial entities    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral 3,076 2,055
Pledged as collateral to special entities such as CRCC, BR and BVC | Debt securities [member]    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral 1,572,060 1,179,027
Pledged as collateral to special entities such as CRCC, BR and BVC | Securities issued or secured by Colombian Government    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral 1,572,060 1,179,027
Pledged as collateral in operations with derivative instruments | Debt securities [member]    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral   1,193
Pledged as collateral in operations with derivative instruments | Securities issued or secured by Colombian Government    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral   1,193
Level 1 of fair value hierarchy [member] | Debt securities [member]    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral 8,697,775 6,450,220
Level 1 of fair value hierarchy [member] | Pledged in money market operations | Debt securities [member]    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral 7,127,460 5,270,000
Level 1 of fair value hierarchy [member] | Pledged in money market operations | Securities issued or secured by Colombian Government    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral 7,127,460 5,270,000
Level 1 of fair value hierarchy [member] | Pledged as collateral to special entities such as CRCC, BR and BVC | Debt securities [member]    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral 1,570,315 1,179,027
Level 1 of fair value hierarchy [member] | Pledged as collateral to special entities such as CRCC, BR and BVC | Securities issued or secured by Colombian Government    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral 1,570,315 1,179,027
Level 1 of fair value hierarchy [member] | Pledged as collateral in operations with derivative instruments | Debt securities [member]    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral   1,193
Level 1 of fair value hierarchy [member] | Pledged as collateral in operations with derivative instruments | Securities issued or secured by Colombian Government    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral   1,193
Level 2 of fair value hierarchy [member] | Debt securities [member]    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral 4,821 2,055
Level 2 of fair value hierarchy [member] | Pledged in money market operations | Debt securities [member]    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral 3,076 2,055
Level 2 of fair value hierarchy [member] | Pledged in money market operations | Securities issued or secured by other financial entities    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral 3,076 $ 2,055
Level 2 of fair value hierarchy [member] | Pledged as collateral to special entities such as CRCC, BR and BVC | Debt securities [member]    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral 1,745  
Level 2 of fair value hierarchy [member] | Pledged as collateral to special entities such as CRCC, BR and BVC | Securities issued or secured by Colombian Government    
Disclosure of financial assets [line items]    
Financial assets pledged as collateral $ 1,745