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RISK MANAGEMENT - Investment debt securities - Concentration by sovereign risk - Tabular disclosure (Details) - COP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of financial assets [line items]    
Central Government debt instruments held $ 36,072,003 $ 27,718,721
Central Government debt instruments held, Percentage 100.00% 100.00%
Central Banks [Member]    
Disclosure of financial assets [line items]    
Central Bank debt instruments held, Percentage 100.00% 100.00%
Total Sovereign Risk $ 36,276,858 $ 27,864,210
Investment grade    
Disclosure of financial assets [line items]    
Central Government debt instruments held $ 32,861,347 $ 25,238,131
Central Government debt instruments held, Percentage 91.10% 91.05%
Investment grade | Central Banks [Member]    
Disclosure of financial assets [line items]    
Central Bank debt instruments held $ 204,855 $ 145,489
Central Bank debt instruments held, Percentage 100.00% 100.00%
Investment grade | COLOMBIA    
Disclosure of financial assets [line items]    
Central Government debt instruments held $ 28,361,534 $ 22,768,597
Central Government debt instruments held, Percentage 78.64% 82.14%
Investment grade | PANAMA    
Disclosure of financial assets [line items]    
Central Government debt instruments held $ 2,724,276 $ 1,077,656
Central Government debt instruments held, Percentage 7.55% 3.89%
Investment grade | PANAMA | Central Banks [Member]    
Disclosure of financial assets [line items]    
Central Bank debt instruments held $ 204,855 $ 145,489
Central Bank debt instruments held, Percentage 100.00% 100.00%
Investment grade | CHILE    
Disclosure of financial assets [line items]    
Central Government debt instruments held $ 238,765 $ 3,768
Central Government debt instruments held, Percentage 0.66% 0.01%
Investment grade | PERU    
Disclosure of financial assets [line items]    
Central Government debt instruments held $ 37,023  
Central Government debt instruments held, Percentage 0.10%  
Investment grade | GERMANY    
Disclosure of financial assets [line items]    
Central Government debt instruments held $ 15,806  
Central Government debt instruments held, Percentage 0.04%  
Investment grade | MEXICO    
Disclosure of financial assets [line items]    
Central Government debt instruments held $ 17,987 $ 16,268
Central Government debt instruments held, Percentage 0.05% 0.06%
Investment grade | UNITED STATES    
Disclosure of financial assets [line items]    
Central Government debt instruments held $ 1,465,956 $ 1,371,842
Central Government debt instruments held, Percentage 4.06% 4.95%
Speculative grade    
Disclosure of financial assets [line items]    
Central Government debt instruments held $ 3,210,656 $ 2,480,590
Central Government debt instruments held, Percentage 8.90% 8.95%
Speculative grade | BRAZIL    
Disclosure of financial assets [line items]    
Central Government debt instruments held $ 30,266 $ 27,643
Central Government debt instruments held, Percentage 0.08% 0.10%
Speculative grade | COLOMBIA    
Disclosure of financial assets [line items]    
Central Government debt instruments held $ 3,101,625 $ 2,384,493
Central Government debt instruments held, Percentage 8.60% 8.60%
Speculative grade | COSTA RICA    
Disclosure of financial assets [line items]    
Central Government debt instruments held $ 78,765 $ 68,454
Central Government debt instruments held, Percentage 0.22% 0.25%