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RISK MANAGEMENT - Credit risk model scenarios - Loss allowance (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)    
Accumulated impairment [member]        
Disclosure of financial assets [line items]        
Financial assets 10,521,501 9,694,456    
Financial assets at amortised cost, category [member]        
Disclosure of financial assets [line items]        
Financial assets (236,970,165) (235,373,468)    
Financial assets at amortised cost, category [member] | Accumulated impairment [member]        
Disclosure of financial assets [line items]        
Financial assets 10,438,261 9,616,860    
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] | Accumulated impairment [member]        
Disclosure of financial assets [line items]        
Financial assets 10,035,715 9,197,514 $ 11,275,612 $ 10,905,171
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member] | Scenario A        
Disclosure of financial assets [line items]        
Financial assets 9,944,875 9,034,631    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member] | Scenario B        
Disclosure of financial assets [line items]        
Financial assets 9,995,354 9,239,368    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member] | Scenario C        
Disclosure of financial assets [line items]        
Financial assets 10,117,504 9,298,614    
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] | Accumulated impairment [member]        
Disclosure of financial assets [line items]        
Financial assets 5,294,622 5,494,190    
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] | Accumulated impairment [member]        
Disclosure of financial assets [line items]        
Financial assets 5,294,600 5,492,746 5,854,745 5,280,406
Commercial lending portfolio [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member] | Scenario A        
Disclosure of financial assets [line items]        
Financial assets 5,272,129 5,390,734    
Commercial lending portfolio [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member] | Scenario B        
Disclosure of financial assets [line items]        
Financial assets 5,289,159 5,472,794    
Commercial lending portfolio [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member] | Scenario C        
Disclosure of financial assets [line items]        
Financial assets 5,341,865 5,523,548    
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] | Accumulated impairment [member]        
Disclosure of financial assets [line items]        
Financial assets 22 1,444 2,386 851
Interbank and overnight funds [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member] | Scenario A        
Disclosure of financial assets [line items]        
Financial assets 127 10,311    
Interbank and overnight funds [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member] | Scenario B        
Disclosure of financial assets [line items]        
Financial assets 126 11,275    
Interbank and overnight funds [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member] | Scenario C        
Disclosure of financial assets [line items]        
Financial assets 136 11,997    
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] | Accumulated impairment [member]        
Disclosure of financial assets [line items]        
Financial assets 4,307,446 3,311,912 4,581,004 4,938,971
Loans to consumers [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member] | Scenario A        
Disclosure of financial assets [line items]        
Financial assets 4,246,126 3,248,144    
Loans to consumers [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member] | Scenario B        
Disclosure of financial assets [line items]        
Financial assets 4,273,465 3,338,076    
Loans to consumers [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member] | Scenario C        
Disclosure of financial assets [line items]        
Financial assets 4,336,939 3,370,089    
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] | Accumulated impairment [member]        
Disclosure of financial assets [line items]        
Financial assets 379,987 352,441 732,407 560,904
Mortgage [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member] | Scenario A        
Disclosure of financial assets [line items]        
Financial assets 372,739 347,828    
Mortgage [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member] | Scenario B        
Disclosure of financial assets [line items]        
Financial assets 378,986 378,471    
Mortgage [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member] | Scenario C        
Disclosure of financial assets [line items]        
Financial assets 384,902 352,819    
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] | Accumulated impairment [member]        
Disclosure of financial assets [line items]        
Financial assets 53,660 38,971 $ 105,070 $ 124,039
Microcredit [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member] | Scenario A        
Disclosure of financial assets [line items]        
Financial assets 53,754 37,614    
Microcredit [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member] | Scenario B        
Disclosure of financial assets [line items]        
Financial assets 53,618 38,752    
Microcredit [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member] | Scenario C        
Disclosure of financial assets [line items]        
Financial assets $ 53,662 $ 40,161