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EMPLOYEE BENEFITS - Liabilities for employee benefits (Details) - COP ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of defined benefit plans [line items]    
Gross employee benefits $ 1,027,429 $ 924,832
Plan Asset (24,126) (17,024)
Net employee benefits 1,003,303 907,808
Short Term Benefits    
Disclosure of defined benefit plans [line items]    
Gross employee benefits 441,644 385,296
Post-Employment benefits    
Disclosure of defined benefit plans [line items]    
Gross employee benefits 405,240 380,207
Long-Term Benefits    
Disclosure of defined benefit plans [line items]    
Gross employee benefits $ 180,545 $ 159,329