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RISK MANAGEMENT - Structural interest rate risk - Accounting sensitivity exercise (Details) - COP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of risk management [abstract]    
Accounting sensitivity exercise to variations in interest rates, basis point increase (as a percent) 1.00%  
Accounting sensitivity exercise to variations in interest rates, 100 basis point increase, net income before income tax expense, increase (decrease), amount $ 33,715 $ 254,981
Accounting sensitivity exercise to variations in interest rates, 100 basis point increase, net income before income tax expense, increase (decrease), percentage (as a percent) 0.46% 4.00%
Accounting sensitivity exercise to variations in interest rates, 100 basis point increase, other comprehensive income (loss) in equity, amount $ 868,462 $ 518,156