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NON-CURRENT ASSETS HELD FOR SALE - Roll forward (Details) - COP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of noncurrent assets held-for-sale [line items]      
Balance at the beginning of the year $ 92,830    
Withdrawals from leaseback operation (79,546) $ (15,179) $ (32,365)
Balance at year end balance 101,184 92,830  
Non-current assets held for sale [member]      
Disclosure of noncurrent assets held-for-sale [line items]      
Balance at the beginning of the year 92,830 208,426 240,412
Additions 72,466 74,812 137,710
Assets sold, net (118,808) (51,863) (60,747)
Increase / decrease by changes in fair value (268) (76) (3,780)
Reclassifications 62,058 (88,609) (135,643)
Effect of movements in exchange rates (7,094) 13,960 (8,310)
Loss of control in subsidiary   (72,014)  
Discontinued operations   8,194 (94)
Balance at year end balance 101,184 92,830 208,426
Non-current assets held for sale [member] | Investment property [member]      
Disclosure of noncurrent assets held-for-sale [line items]      
Reclassifications (95,593) (31,184) (22,847)
Non-current assets held for sale [member] | Other assets [member]      
Disclosure of noncurrent assets held-for-sale [line items]      
Reclassifications 25,654 (62,943) (111,442)
Non-current assets held for sale [member] | Property, plant and equipment [member]      
Disclosure of noncurrent assets held-for-sale [line items]      
Reclassifications $ 131,997 $ 5,536 1,074
Non-current assets held for sale [member] | Concession arrangements [member]      
Disclosure of noncurrent assets held-for-sale [line items]      
Reclassifications     (2,516)
Non-current assets held for sale [member] | Right of use assets      
Disclosure of noncurrent assets held-for-sale [line items]      
Reclassifications     $ 102