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GOODWILL - Cash-generating units - General information (Details) - COP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of information for cash-generating units [line items]    
Explanation of period over which management has projected cash flows Such calculations used cash flow projections, covering periods from 5 to 20 years.  
Impairment   $ 10,000
Bottom of range [member]    
Disclosure of information for cash-generating units [line items]    
Explanation of period over which management has projected cash flows, period 5 years  
Top of range [member]    
Disclosure of information for cash-generating units [line items]    
Explanation of period over which management has projected cash flows, period 20 years  
Sociedad Administradora de Fondos de Pensiones y Cesantias Porvenir S.A.    
Disclosure of information for cash-generating units [line items]    
Explanation of period over which management has projected cash flows 13-years projection  
Explanation of period over which management has projected cash flows, period 13 years  
Recoverable amount of asset or cash-generating unit $ 14,635,179  
Exceeds the book value of cash generating-unit $ 11,587,030  
Growth rate used to extrapolate cash flow projections 3.00%  
Increase decrease in discount rate applied to cash flow projections 0.50%  
Recoverable value if discount rate was 0.5% higher $ 13,436,597  
Book value of cash-generating unit $ 3,048,149  
Banco de Bogota S.A. over Megabanco    
Disclosure of information for cash-generating units [line items]    
Explanation of period over which management has projected cash flows 5-years projection  
Explanation of period over which management has projected cash flows, period 5 years  
Recoverable amount of asset or cash-generating unit $ 13,241,975  
Exceeds the book value of cash generating-unit $ 6,297,072  
Growth rate used to extrapolate cash flow projections 6.10%  
Increase decrease in discount rate applied to cash flow projections 0.50%  
Recoverable value if discount rate was 0.5% higher $ 12,006,417  
Book value of cash-generating unit $ 6,944,903  
Banco Popular S.A.    
Disclosure of information for cash-generating units [line items]    
Explanation of period over which management has projected cash flows 5-years projection  
Explanation of period over which management has projected cash flows, period 5 years  
Recoverable amount of asset or cash-generating unit $ 4,131,229  
Exceeds the book value of cash generating-unit $ 1,487,724  
Growth rate used to extrapolate cash flow projections 6.10%  
Increase decrease in discount rate applied to cash flow projections 0.50%  
Recoverable value if discount rate was 0.5% higher $ 3,505,844  
Book value of cash-generating unit $ 2,643,505  
Banco de Bogota S.A.    
Disclosure of information for cash-generating units [line items]    
Explanation of period over which management has projected cash flows 5-years projection  
Explanation of period over which management has projected cash flows, period 5 years  
Recoverable amount of asset or cash-generating unit $ 27,840,439  
Exceeds the book value of cash generating-unit $ 18,151,772  
Growth rate used to extrapolate cash flow projections 6.10%  
Increase decrease in discount rate applied to cash flow projections 0.50%  
Recoverable value if discount rate was 0.5% higher $ 25,304,639  
Book value of cash-generating unit 9,688,667  
Multi Financial Group Inc [member]    
Disclosure of information for cash-generating units [line items]    
Recoverable amount of asset or cash-generating unit 2,590,461  
Exceeds the book value of cash generating-unit $ 542,784  
Growth rate used to extrapolate cash flow projections 5.50%  
Increase decrease in discount rate applied to cash flow projections 0.50%  
Recoverable value if discount rate was 0.5% higher $ 2,351,717  
Book value of cash-generating unit $ 2,047,677