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RISK MANAGEMENT - Investment debt securities - Concentration by location (Details) - COP ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of financial assets [line items]    
Financial assets $ 280,746,878 $ 274,682,875
Debt securities [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 40,438,606 35,995,562
Debt securities [member] | Gross carrying amount [member] | Countries    
Disclosure of financial assets [line items]    
Financial assets 40,104,308 35,490,736
Debt securities [member] | Gross carrying amount [member] | Colombia    
Disclosure of financial assets [line items]    
Financial assets 33,713,283 28,040,520
Debt securities [member] | Gross carrying amount [member] | Panama    
Disclosure of financial assets [line items]    
Financial assets 3,952,223 4,381,752
Debt securities [member] | Gross carrying amount [member] | United States    
Disclosure of financial assets [line items]    
Financial assets 1,421,010 2,213,308
Debt securities [member] | Gross carrying amount [member] | Brazil    
Disclosure of financial assets [line items]    
Financial assets 114,879 264,073
Debt securities [member] | Gross carrying amount [member] | Mexico    
Disclosure of financial assets [line items]    
Financial assets 410,599 221,754
Debt securities [member] | Gross carrying amount [member] | Costa Rica    
Disclosure of financial assets [line items]    
Financial assets 95,643 143,513
Debt securities [member] | Gross carrying amount [member] | Chile    
Disclosure of financial assets [line items]    
Financial assets 182,398 115,033
Debt securities [member] | Gross carrying amount [member] | Peru    
Disclosure of financial assets [line items]    
Financial assets 177,096 102,190
Debt securities [member] | Gross carrying amount [member] | Paraguay    
Disclosure of financial assets [line items]    
Financial assets 37,177 8,593
Debt securities [member] | Gross carrying amount [member] | Multilateral    
Disclosure of financial assets [line items]    
Financial assets 334,298 504,826
Debt securities [member] | Gross carrying amount [member] | Multilateral - Bladex (Foreign Trade Bank of Latin America)    
Disclosure of financial assets [line items]    
Financial assets 225,642 277,501
Debt securities [member] | Gross carrying amount [member] | Multilateral - Andean Development Corporation (Corporacion Andina de Fomento)    
Disclosure of financial assets [line items]    
Financial assets 105,107 111,124
Debt securities [member] | Gross carrying amount [member] | Multilateral - International Bank for Reconstruction and Development    
Disclosure of financial assets [line items]    
Financial assets   89,266
Debt securities [member] | Gross carrying amount [member] | Multilateral - Inter-American Corporation for the Financing of Infrastructure    
Disclosure of financial assets [line items]    
Financial assets $ 3,549 $ 26,935