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ANALYSIS OF OPERATING SEGMENTS - Revenue from contracts with customers (Details) - COP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of operating segments [line items]      
Revenue from contracts with customers $ 15,579,892 $ 16,015,766 $ 14,246,843
Goods or services transferred at point in time [member]      
Disclosure of operating segments [line items]      
Revenue from contracts with customers 606,015 567,374 460,204
Goods or services transferred over time [member]      
Disclosure of operating segments [line items]      
Revenue from contracts with customers 14,973,877 15,448,392 13,786,639
Operating segments [member] | Banking Services      
Disclosure of operating segments [line items]      
Revenue from contracts with customers 3,383,055 3,003,635 2,632,034
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 142,134 318,011 273,025
Operating segments [member] | Banking Services | Goods or services transferred over time [member]      
Disclosure of operating segments [line items]      
Revenue from contracts with customers 3,240,921 2,685,624 2,359,009
Operating segments [member] | Merchant Banking      
Disclosure of operating segments [line items]      
Revenue from contracts with customers 11,207,150 12,117,232 10,406,561
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 400,146 193,572 139,770
Operating segments [member] | Merchant Banking | Goods or services transferred over time [member]      
Disclosure of operating segments [line items]      
Revenue from contracts with customers 10,807,004 11,923,660 10,266,791
Operating segments [member] | Pension and Severance Fund Management      
Disclosure of operating segments [line items]      
Revenue from contracts with customers 1,063,588 956,465 1,260,013
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 75,527 62,743 54,701
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 988,061 893,722 1,205,312
Operating segments [member] | Holding      
Disclosure of operating segments [line items]      
Revenue from contracts with customers 292,641 282,924 284,231
Operating segments [member] | Holding | Goods or services transferred at point in time [member]      
Disclosure of operating segments [line items]      
Revenue from contracts with customers 292,641 282,924 284,231
Elimination of intersegment amounts [member]      
Disclosure of operating segments [line items]      
Revenue from contracts with customers (366,542) (344,490) (335,996)
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 (304,433) (289,876) (291,523)
Elimination of intersegment amounts [member] | Goods or services transferred over time [member]      
Disclosure of operating segments [line items]      
Revenue from contracts with customers $ (62,109) $ (54,614) $ (44,473)