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RISK MANAGEMENT - Credit risk model scenarios - Gross exposure (Details) - COP ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of financial assets [line items]        
Financial assets $ 280,746,878 $ 274,682,875    
Financial assets at amortised cost, category [member]        
Disclosure of financial assets [line items]        
Financial assets 236,970,165 235,373,468    
Loan portfolio [member] | Financial assets at amortised cost, category [member]        
Disclosure of financial assets [line items]        
Financial assets 176,168,055 179,115,847    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 186,203,770 188,313,361 $ 231,573,437 $ 206,447,165
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Scenario A        
Disclosure of financial assets [line items]        
Financial assets 186,203,770 188,313,361    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Scenario B        
Disclosure of financial assets [line items]        
Financial assets 186,203,770 188,313,361    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Scenario C        
Disclosure of financial assets [line items]        
Financial assets 186,203,770 188,313,361    
Loans to corporate entities [member] | Financial assets at amortised cost, category [member]        
Disclosure of financial assets [line items]        
Financial assets 102,145,802 105,248,652    
Loans to corporate entities [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 107,440,424 110,742,842    
Commercial lending portfolio [member] | Financial assets at amortised cost, category [member]        
Disclosure of financial assets [line items]        
Financial assets 101,753,217 99,282,353    
Commercial lending portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 107,047,817 104,775,099 122,027,804 110,986,938
Commercial lending portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Scenario A        
Disclosure of financial assets [line items]        
Financial assets 107,047,817 104,775,099    
Commercial lending portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Scenario B        
Disclosure of financial assets [line items]        
Financial assets 107,047,817 104,775,099    
Commercial lending portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Scenario C        
Disclosure of financial assets [line items]        
Financial assets 107,047,817 104,775,099    
Interbank and overnight funds [member] | Financial assets at amortised cost, category [member]        
Disclosure of financial assets [line items]        
Financial assets 392,585 5,966,299    
Interbank and overnight funds [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 392,607 5,967,743 3,218,433 4,693,678
Interbank and overnight funds [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Scenario A        
Disclosure of financial assets [line items]        
Financial assets 392,607 5,967,743    
Interbank and overnight funds [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Scenario B        
Disclosure of financial assets [line items]        
Financial assets 392,607 5,967,743    
Interbank and overnight funds [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Scenario C        
Disclosure of financial assets [line items]        
Financial assets 392,607 5,967,743    
Loans to consumers [member] | Financial assets at amortised cost, category [member]        
Disclosure of financial assets [line items]        
Financial assets 55,692,165 56,107,532    
Loans to consumers [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 59,999,611 59,419,444 76,889,145 65,835,457
Loans to consumers [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Scenario A        
Disclosure of financial assets [line items]        
Financial assets 59,999,611 59,419,444    
Loans to consumers [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Scenario B        
Disclosure of financial assets [line items]        
Financial assets 59,999,611 59,419,444    
Loans to consumers [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Scenario C        
Disclosure of financial assets [line items]        
Financial assets 59,999,611 59,419,444    
Mortgage [member] | Financial assets at amortised cost, category [member]        
Disclosure of financial assets [line items]        
Financial assets 18,106,219 17,530,914    
Mortgage [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 18,486,206 17,883,355 29,120,316 24,558,771
Mortgage [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Scenario A        
Disclosure of financial assets [line items]        
Financial assets 18,486,206 17,883,355    
Mortgage [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Scenario B        
Disclosure of financial assets [line items]        
Financial assets 18,486,206 17,883,355    
Mortgage [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Scenario C        
Disclosure of financial assets [line items]        
Financial assets 18,486,206 17,883,355    
Microcredit [member] | Financial assets at amortised cost, category [member]        
Disclosure of financial assets [line items]        
Financial assets 223,869 228,749    
Microcredit [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 277,529 267,720 $ 317,739 $ 372,321
Microcredit [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Scenario A        
Disclosure of financial assets [line items]        
Financial assets 277,529 267,720    
Microcredit [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Scenario B        
Disclosure of financial assets [line items]        
Financial assets 277,529 267,720    
Microcredit [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Scenario C        
Disclosure of financial assets [line items]        
Financial assets $ 277,529 $ 267,720