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EMPLOYEE BENEFITS - Post-employment and long-term benefits movements (Details) - COP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Post-Employment benefits      
Disclosure of net defined benefit liability (asset) [line items]      
Balance at the beginning of the year $ 331,411 $ 475,356  
Balance at the end of the year 363,183 331,411 $ 475,356
Long-Term Benefits      
Disclosure of net defined benefit liability (asset) [line items]      
Balance at the beginning of the year 133,085 134,831  
Balance at the end of the year 159,329 133,085 134,831
Plan obligation | Post-Employment benefits      
Disclosure of net defined benefit liability (asset) [line items]      
Balance at the beginning of the year 349,587 522,196 597,936
Service costs 2,690 3,845 2,749
Interests cost 41,736 30,778 30,705
Gain on settlements     278
Past Service Costs (2,079)    
Net defined benefit liability asset After Adjustment 391,934 556,819 631,668
Changes in actuarial assumptions from changes in demographic assumptions (753)   (15)
Changes in actuarial assumptions from changes in financial assumptions 26,832 (69,967) (54,996)
Changes in actuarial assumptions from changes in the experience 27,472 2,167 (21,264)
Total changes in actuarial assumptions 53,551 (67,800) (76,275)
Payments to employees (61,589) (51,306) (51,591)
Liquidation of entities   (432)  
Loss of control in subsidiary   (98,024)  
Discontinued operations   6,251 15,125
Reclassification BAC     (1,002)
Effect of movements in exchange rates (3,689) 4,079 4,271
Balance at the end of the year 380,207 349,587 522,196
Plan obligation | Long-Term Benefits      
Disclosure of net defined benefit liability (asset) [line items]      
Balance at the beginning of the year 133,085 134,831 180,090
Service costs 14,765 14,815 18,454
Interests cost 16,699 8,949 7,982
Past Service Costs 10,063   (28,009)
Net defined benefit liability asset After Adjustment 174,612 158,595 178,517
Changes in actuarial assumptions from changes in demographic assumptions (7,342)   (86)
Changes in actuarial assumptions from changes in financial assumptions 473 (14,149) (19,976)
Changes in actuarial assumptions from changes in the experience 17,313 10,456 (2,893)
Total changes in actuarial assumptions 10,444 (3,693) (22,955)
Payments to employees (25,727) (21,817) (20,731)
Balance at the end of the year 159,329 133,085 134,831
Plan Assets | Post-Employment benefits      
Disclosure of net defined benefit liability (asset) [line items]      
Balance at the beginning of the year (18,176) (46,840) (38,241)
Interests cost (794) (427) (522)
Loss of control in subsidiary   27,269  
Discontinued operations     (798)
Remeasurements on plan assets (1,788) 5,885 (1,676)
Reclassification BAC     (3,189)
Effect of movements in exchange rates 3,734 (4,063) (2,414)
Balance at the end of the year $ (17,024) $ (18,176) $ (46,840)