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RISK MANAGEMENT - Credit risk model scenarios - Loss allowance (Details) - COP ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of financial assets [line items]        
Financial assets $ (304,853,883) $ (280,746,878)    
Accumulated impairment [member]        
Disclosure of financial assets [line items]        
Financial assets 10,478,009 10,521,501    
Financial assets at amortised cost, category [member]        
Disclosure of financial assets [line items]        
Financial assets (251,981,889) (236,970,165)    
Financial assets at amortised cost, category [member] | Accumulated impairment [member]        
Disclosure of financial assets [line items]        
Financial assets 10,387,285 10,438,261    
Loan portfolio [member] | Financial assets at amortised cost, category [member]        
Disclosure of financial assets [line items]        
Financial assets (190,129,486) (176,168,055)    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Accumulated depreciation, amortisation and impairment [member]        
Disclosure of financial assets [line items]        
Financial assets 10,006,639 10,035,715    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member]        
Disclosure of financial assets [line items]        
Financial assets 10,006,639 10,035,715 $ 9,197,514 $ 11,275,612
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member] | Scenario A        
Disclosure of financial assets [line items]        
Financial assets 9,902,575 9,944,875    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member] | Scenario B        
Disclosure of financial assets [line items]        
Financial assets 9,983,548 9,995,354    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member] | Scenario C        
Disclosure of financial assets [line items]        
Financial assets 10,157,126 10,117,504    
Loans to corporate entities [member] | Financial assets at amortised cost, category [member]        
Disclosure of financial assets [line items]        
Financial assets (110,756,010) (102,145,802)    
Loans to corporate entities [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member]        
Disclosure of financial assets [line items]        
Financial assets 5,363,688 5,294,622    
Commercial lending portfolio [member] | Financial assets at amortised cost, category [member]        
Disclosure of financial assets [line items]        
Financial assets (110,051,750) (101,753,217)    
Commercial lending portfolio [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member]        
Disclosure of financial assets [line items]        
Financial assets 5,362,893 5,294,600 5,492,746 5,854,745
Commercial lending portfolio [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member] | Scenario A        
Disclosure of financial assets [line items]        
Financial assets 5,309,528 5,272,129    
Commercial lending portfolio [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member] | Scenario B        
Disclosure of financial assets [line items]        
Financial assets 5,336,949 5,289,159    
Commercial lending portfolio [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member] | Scenario C        
Disclosure of financial assets [line items]        
Financial assets 5,430,691 5,341,865    
Interbank and overnight funds [member] | Financial assets at amortised cost, category [member]        
Disclosure of financial assets [line items]        
Financial assets (704,260) (392,585)    
Interbank and overnight funds [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member]        
Disclosure of financial assets [line items]        
Financial assets 795 22 1,444 2,386
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 2,505 127    
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 2,619 126    
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 3,029 136    
Loans to consumers [member] | Financial assets at amortised cost, category [member]        
Disclosure of financial assets [line items]        
Financial assets (57,810,307) (55,692,165)    
Loans to consumers [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member]        
Disclosure of financial assets [line items]        
Financial assets 4,166,018 4,307,446 3,311,912 4,581,004
Loans to consumers [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member] | Scenario A        
Disclosure of financial assets [line items]        
Financial assets 4,118,656 4,246,126    
Loans to consumers [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member] | Scenario B        
Disclosure of financial assets [line items]        
Financial assets 4,168,736 4,273,465    
Loans to consumers [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member] | Scenario C        
Disclosure of financial assets [line items]        
Financial assets 4,239,720 4,336,939    
Mortgages [member] | Financial assets at amortised cost, category [member]        
Disclosure of financial assets [line items]        
Financial assets (21,562,412) (18,106,219)    
Mortgages [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member]        
Disclosure of financial assets [line items]        
Financial assets 473,315 379,987 352,441 732,407
Mortgages [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member] | Scenario A        
Disclosure of financial assets [line items]        
Financial assets 468,275 372,739    
Mortgages [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member] | Scenario B        
Disclosure of financial assets [line items]        
Financial assets 471,634 378,986    
Mortgages [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member] | Scenario C        
Disclosure of financial assets [line items]        
Financial assets 480,073 384,902    
Microcredit [member] | Financial assets at amortised cost, category [member]        
Disclosure of financial assets [line items]        
Financial assets (757) (223,869)    
Microcredit [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member]        
Disclosure of financial assets [line items]        
Financial assets 3,618 53,660 $ 38,971 $ 105,070
Microcredit [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member] | Scenario A        
Disclosure of financial assets [line items]        
Financial assets 3,611 53,754    
Microcredit [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member] | Scenario B        
Disclosure of financial assets [line items]        
Financial assets 3,610 53,618    
Microcredit [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member] | Scenario C        
Disclosure of financial assets [line items]        
Financial assets $ 3,613 $ 53,662