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RISK MANAGEMENT - Investment debt securities - Concentration by location (Details) - COP ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of financial assets [line items]    
Financial assets $ 304,853,883 $ 280,746,878
Debt securities | Gross carrying amount    
Disclosure of financial assets [line items]    
Financial assets 49,697,404 40,438,606
Debt securities | Gross carrying amount | Countries    
Disclosure of financial assets [line items]    
Financial assets 49,359,851 40,104,308
Debt securities | Gross carrying amount | COLOMBIA    
Disclosure of financial assets [line items]    
Financial assets 39,769,376 33,713,283
Debt securities | Gross carrying amount | PANAMA    
Disclosure of financial assets [line items]    
Financial assets 6,114,059 3,952,223
Debt securities | Gross carrying amount | UNITED STATES    
Disclosure of financial assets [line items]    
Financial assets 1,543,389 1,421,010
Debt securities | Gross carrying amount | BRAZIL    
Disclosure of financial assets [line items]    
Financial assets 128,970 114,879
Debt securities | Gross carrying amount | MEXICO    
Disclosure of financial assets [line items]    
Financial assets 583,979 410,599
Debt securities | Gross carrying amount | COSTA RICA    
Disclosure of financial assets [line items]    
Financial assets 110,714 95,643
Debt securities | Gross carrying amount | CHILE    
Disclosure of financial assets [line items]    
Financial assets 524,430 182,398
Debt securities | Gross carrying amount | PERU    
Disclosure of financial assets [line items]    
Financial assets 443,698 177,096
Debt securities | Gross carrying amount | PARAGUAY    
Disclosure of financial assets [line items]    
Financial assets 102,473 37,177
Debt securities | Gross carrying amount | JAPAN    
Disclosure of financial assets [line items]    
Financial assets 22,957  
Debt securities | Gross carrying amount | GERMANY    
Disclosure of financial assets [line items]    
Financial assets 15,806  
Debt securities | Gross carrying amount | Multilateral    
Disclosure of financial assets [line items]    
Financial assets 337,553 334,298
Debt securities | Gross carrying amount | Multilateral - Bladex (Foreign Trade Bank of Latin America)    
Disclosure of financial assets [line items]    
Financial assets 216,218 225,642
Debt securities | Gross carrying amount | Multilateral - Andean Development Corporation (Corporacion Andina de Fomento)    
Disclosure of financial assets [line items]    
Financial assets 117,061 105,107
Debt securities | Gross carrying amount | Multilateral - Inter-American Corporation for the Financing of Infrastructure    
Disclosure of financial assets [line items]    
Financial assets $ 4,274 $ 3,549