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ESTIMATION OF FAIR VALUE - Reconciliation Level 3 of the fair value hierarchy - Tabular disclosure (Details) - COP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of fair value measurement of assets [line items]      
Assets at the beginning of the period $ 301,181,596    
Changes in fair value recognised in profit or loss 350,919 $ 323,685 $ 278,751
Assets at the end of the period 327,859,383 301,181,596  
Recurring fair value measurement [member]      
Disclosure of fair value measurement of assets [line items]      
Assets at the beginning of the period 44,913,854    
Assets at the end of the period 54,083,268 44,913,854  
Recurring fair value measurement [member] | Level 3 of fair value hierarchy [member]      
Disclosure of fair value measurement of assets [line items]      
Assets at the beginning of the period 7,740,172    
Assets at the end of the period 8,707,511 7,740,172  
Financial Assets In Concession [Member] | Recurring fair value measurement [member] | Level 3 of fair value hierarchy [member]      
Disclosure of fair value measurement of assets [line items]      
Assets at the beginning of the period 3,830,916 3,507,231 3,228,480
Changes in fair value recognised in profit or loss 350,919 323,685 278,751
Assets at the end of the period 4,181,835 3,830,916 3,507,231
Debt securities [member] | Recurring fair value measurement [member]      
Disclosure of fair value measurement of assets [line items]      
Assets at the beginning of the period 30,442,045    
Assets at the end of the period 38,989,037 30,442,045  
Debt securities [member] | Recurring fair value measurement [member] | Level 3 of fair value hierarchy [member]      
Disclosure of fair value measurement of assets [line items]      
Assets at the beginning of the period 1,889 1,383 88,821
Changes in fair value recognised in profit or loss (464) 506 (58,845)
Changes in fair value recognised in OCI     671,348
Additions     227,854
Sales/redemptions     (783,552)
Loss of control in subsidiary     (71,248)
Transfers from level 2 to level 3     (72,995)
Assets at the end of the period 1,425 1,889 1,383
Equity securities | Recurring fair value measurement [member]      
Disclosure of fair value measurement of assets [line items]      
Assets at the beginning of the period 7,377,523    
Assets at the end of the period 8,677,809 7,377,523  
Equity securities | Recurring fair value measurement [member] | Level 3 of fair value hierarchy [member]      
Disclosure of fair value measurement of assets [line items]      
Assets at the beginning of the period 2,770,226 2,302,280 1,357,164
Changes in fair value recognised in profit or loss 224,673 204,276 80,408
Changes in fair value recognised in OCI (6,819) 39,566 16,613
Additions 326,096 830,718 918,046
Sales/redemptions (1,199) (606,614) (13,062)
Discontinued operations     1
Loss of control in subsidiary     (56,599)
Transfers from level 2 to level 3     (291)
Assets at the end of the period 3,312,977 2,770,226 2,302,280
Biological assets [member] | Recurring fair value measurement [member]      
Disclosure of fair value measurement of assets [line items]      
Assets at the beginning of the period 230,672    
Assets at the end of the period 238,339 230,672  
Biological assets [member] | Recurring fair value measurement [member] | Level 3 of fair value hierarchy [member]      
Disclosure of fair value measurement of assets [line items]      
Assets at the beginning of the period 230,672 212,630 154,986
Changes in fair value recognised in profit or loss 7,589 18,601 56,859
Additions 26,572 26,118 28,368
Sales/redemptions (26,494) (26,677) (27,583)
Assets at the end of the period 238,339 230,672 212,630
Investment property [member] | Recurring fair value measurement [member]      
Disclosure of fair value measurement of assets [line items]      
Assets at the beginning of the period 906,469    
Assets at the end of the period 972,935 906,469  
Investment property [member] | Recurring fair value measurement [member] | Level 3 of fair value hierarchy [member]      
Disclosure of fair value measurement of assets [line items]      
Assets at the beginning of the period 906,469 880,963 852,935
Changes in fair value recognised in profit or loss 35,841 84,958 55,930
Changes in fair value recognised in OCI 16,935 557 797
Transfers to non-current assets held for sale 22,370 95,593 31,184
Reclassification 32,470 (4,160) (4,493)
Effect of movements in exchange rates 6,966 (7,079) 2,282
Additions 37,859 56,307 70,081
Sales/redemptions (85,975) (200,670) (127,753)
Assets at the end of the period $ 972,935 $ 906,469 $ 880,963