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ANALYSIS OF OPERATING SEGMENTS - Revenue from contracts with customers (Details) - COP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of operating segments [line items]      
Revenue from contracts with customers $ 15,664,744 $ 15,579,892 $ 16,015,766
Goods or services transferred at point in time [member]      
Disclosure of operating segments [line items]      
Revenue from contracts with customers 752,551 606,015 567,374
Goods or services transferred over time [member]      
Disclosure of operating segments [line items]      
Revenue from contracts with customers 14,912,193 14,973,877 15,448,392
Operating segments [member] | Banking Services      
Disclosure of operating segments [line items]      
Revenue from contracts with customers 3,465,811 3,383,055 3,003,635
Operating segments [member] | Banking Services | Goods or services transferred at point in time [member]      
Disclosure of operating segments [line items]      
Revenue from contracts with customers 165,173 142,134 318,011
Operating segments [member] | Banking Services | Goods or services transferred over time [member]      
Disclosure of operating segments [line items]      
Revenue from contracts with customers 3,300,638 3,240,921 2,685,624
Operating segments [member] | Merchant Banking      
Disclosure of operating segments [line items]      
Revenue from contracts with customers 11,018,584 11,207,150 12,117,232
Operating segments [member] | Merchant Banking | Goods or services transferred at point in time [member]      
Disclosure of operating segments [line items]      
Revenue from contracts with customers 523,221 400,146 193,572
Operating segments [member] | Merchant Banking | Goods or services transferred over time [member]      
Disclosure of operating segments [line items]      
Revenue from contracts with customers 10,495,363 10,807,004 11,923,660
Operating segments [member] | Pension and Severance Fund Management      
Disclosure of operating segments [line items]      
Revenue from contracts with customers 1,269,914 1,063,588 956,465
Operating segments [member] | Pension and Severance Fund Management | Goods or services transferred at point in time [member]      
Disclosure of operating segments [line items]      
Revenue from contracts with customers 84,808 75,527 62,743
Operating segments [member] | Pension and Severance Fund Management | Goods or services transferred over time [member]      
Disclosure of operating segments [line items]      
Revenue from contracts with customers 1,185,106 988,061 893,722
Operating segments [member] | Holding      
Disclosure of operating segments [line items]      
Revenue from contracts with customers 284,991 292,641 282,924
Operating segments [member] | Holding | Goods or services transferred at point in time [member]      
Disclosure of operating segments [line items]      
Revenue from contracts with customers 284,991 292,641 282,924
Elimination of intersegment amounts [member]      
Disclosure of operating segments [line items]      
Revenue from contracts with customers (374,556) (366,542) (344,490)
Elimination of intersegment amounts [member] | Goods or services transferred at point in time [member]      
Disclosure of operating segments [line items]      
Revenue from contracts with customers (305,642) (304,433) (289,876)
Elimination of intersegment amounts [member] | Goods or services transferred over time [member]      
Disclosure of operating segments [line items]      
Revenue from contracts with customers $ (68,914) $ (62,109) $ (54,614)