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GOODWILL - Cash-generating units - General information (Details) - COP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
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 $ 12,257
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 $ 9,666,524  
Exceeds the book value of cash generating-unit $ 6,618,375  
Growth rate used to extrapolate cash flow projections 3.10%  
Increase decrease in discount rate applied to cash flow projections 0.50%  
Recoverable value if discount rate was 0.5% higher $ 8,958,407  
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 $ 12,391,866  
Exceeds the book value of cash generating-unit $ 6,039,628  
Growth rate used to extrapolate cash flow projections 6.50%  
Increase decrease in discount rate applied to cash flow projections 0.50%  
Recoverable value if discount rate was 0.5% higher $ 11,213,891  
Book value of cash-generating unit $ 6,352,238  
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 $ 3,776,691  
Exceeds the book value of cash generating-unit $ 838,149  
Growth rate used to extrapolate cash flow projections 6.00%  
Increase decrease in discount rate applied to cash flow projections 0.50%  
Recoverable value if discount rate was 0.5% higher $ 3,442,796  
Book value of cash-generating unit $ 2,938,542  
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 $ 14,060,477  
Exceeds the book value of cash generating-unit $ 5,054,718  
Growth rate used to extrapolate cash flow projections 6.00%  
Increase decrease in discount rate applied to cash flow projections 0.50%  
Recoverable value if discount rate was 0.5% higher $ 12,865,943  
Book value of cash-generating unit 9,005,759  
Multi Financial Group Inc [member]    
Disclosure of information for cash-generating units [line items]    
Recoverable amount of asset or cash-generating unit 2,503,432  
Exceeds the book value of cash generating-unit $ 829,630  
Growth rate used to extrapolate cash flow projections 5.60%  
Increase decrease in discount rate applied to cash flow projections 0.50%  
Recoverable value if discount rate was 0.5% higher $ 2,273,792  
Book value of cash-generating unit $ 1,673,802