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EMPLOYEE BENEFITS - Future benefit payments (Details) - COP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Post-Employment benefits    
Disclosure of defined benefit plans [line items]    
Estimate of contributions expected to be paid to plan for next annual reporting period $ 488,247  
Weighted average duration of defined benefit obligation 5 years 10 months 20 days 5 years 6 months 7 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 $ 61,487  
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 56,004  
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 52,583  
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 51,751  
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 48,748  
Post-Employment benefits | 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 217,674  
Long-Term Benefits    
Disclosure of defined benefit plans [line items]    
Estimate of contributions expected to be paid to plan for next annual reporting period $ 219,778  
Weighted average duration of defined benefit obligation 4 years 2 months 1 day 3 years 9 months
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 $ 32,940  
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 25,538  
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 26,331  
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 24,272  
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 23,559  
Long-Term Benefits | 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 $ 87,138