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EMPLOYEE BENEFITS - Liabilities for employee benefits (Details) - COP ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of defined benefit plans [line items]    
Gross employee benefits $ 924,832 $ 908,195
Plan Asset (17,024) (18,176)
Net employee benefits 907,808 890,019
Short Term Benefits    
Disclosure of defined benefit plans [line items]    
Gross employee benefits 385,296 425,523
Post-Employment benefits    
Disclosure of defined benefit plans [line items]    
Gross employee benefits 380,207 349,587
Long-Term Benefits    
Disclosure of defined benefit plans [line items]    
Gross employee benefits $ 159,329 $ 133,085