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EMPLOYEE BENEFITS - Future benefit payments (Details) - COP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Post-Employment benefits    
Disclosure of defined benefit plans [line items]    
Estimate of contributions expected to be paid to plan for next annual reporting period $ 525,823  
Weighted average duration of defined benefit obligation 5 years 6 months 7 days 4 years 7 months 13 days
Post-Employment benefits | Not later than one year [member]    
Disclosure of defined benefit plans [line items]    
Estimate of contributions expected to be paid to plan for next annual reporting period $ 57,922  
Post-Employment benefits | Later than one year and not later than two years [member]    
Disclosure of defined benefit plans [line items]    
Estimate of contributions expected to be paid to plan for next annual reporting period 58,572  
Post-Employment benefits | Later than two years and not later than three years [member]    
Disclosure of defined benefit plans [line items]    
Estimate of contributions expected to be paid to plan for next annual reporting period 57,227  
Post-Employment benefits | Later than three years and not later than four years [member]    
Disclosure of defined benefit plans [line items]    
Estimate of contributions expected to be paid to plan for next annual reporting period 54,944  
Post-Employment benefits | Later than four years and not later than five years [member]    
Disclosure of defined benefit plans [line items]    
Estimate of contributions expected to be paid to plan for next annual reporting period 53,979  
Post-Employment benefits | More than 5 years [member]    
Disclosure of defined benefit plans [line items]    
Estimate of contributions expected to be paid to plan for next annual reporting period 243,179  
Long-Term Benefits    
Disclosure of defined benefit plans [line items]    
Estimate of contributions expected to be paid to plan for next annual reporting period $ 202,924  
Weighted average duration of defined benefit obligation 3 years 9 months 3 years 6 months 21 days
Long-Term Benefits | Not later than one year [member]    
Disclosure of defined benefit plans [line items]    
Estimate of contributions expected to be paid to plan for next annual reporting period $ 31,798  
Long-Term Benefits | Later than one year and not later than two years [member]    
Disclosure of defined benefit plans [line items]    
Estimate of contributions expected to be paid to plan for next annual reporting period 27,668  
Long-Term Benefits | Later than two years and not later than three years [member]    
Disclosure of defined benefit plans [line items]    
Estimate of contributions expected to be paid to plan for next annual reporting period 22,014  
Long-Term Benefits | Later than three years and not later than four years [member]    
Disclosure of defined benefit plans [line items]    
Estimate of contributions expected to be paid to plan for next annual reporting period 22,121  
Long-Term Benefits | Later than four years and not later than five years [member]    
Disclosure of defined benefit plans [line items]    
Estimate of contributions expected to be paid to plan for next annual reporting period 19,934  
Long-Term Benefits | More than 5 years [member]    
Disclosure of defined benefit plans [line items]    
Estimate of contributions expected to be paid to plan for next annual reporting period $ 79,389