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LEGAL RELATED AND NON-LEGAL RELATED PROVISIONS - Roll forward (Details) - COP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of other provisions [line items]      
Beginning Balance $ 1,227,171 $ 1,150,261 $ 912,850
Provisions increased during the period 633,693 563,299 607,262
Use of provisions (389,696) (245,301) (120,318)
Reversed provisions not utilized (368,840) (217,655) (265,464)
Effect of movements in exchange rates (19,045) 18,180 8,152
Reclassification BAC   (42,240) (6,367)
Discontinued operations   627 14,146
Ending Balance 1,083,283 1,227,171 1,150,261
Legal proceedings provision [member]      
Disclosure of other provisions [line items]      
Beginning Balance 229,193 247,529 241,774
Provisions increased during the period 298,719 183,294 196,452
Use of provisions (51,160) (44,895) (72,892)
Reversed provisions not utilized (258,421) (155,475) (118,865)
Effect of movements in exchange rates (642) 370 503
Reclassification BAC   (2,047) (9,749)
Discontinued operations   417 10,306
Ending Balance 217,689 229,193 247,529
Miscellaneous other provisions [member]      
Disclosure of other provisions [line items]      
Beginning Balance 997,978 902,732 671,076
Provisions increased during the period 334,974 380,005 410,810
Use of provisions (338,536) (200,406) (47,426)
Reversed provisions not utilized (110,419) (62,180) (146,599)
Effect of movements in exchange rates (18,403) 17,810 7,649
Reclassification BAC   (40,193) 3,382
Discontinued operations   210 3,840
Ending Balance $ 865,594 $ 997,978 $ 902,732