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RISK MANAGEMENT - Credit risk model - Loss allowance (Details) - COP ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets $ (304,853,883) $ (280,746,878)    
Accumulated impairment [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 10,478,009 10,521,501    
Accumulated impairment [member] | Loan commitments and financial guarantee contracts [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 72,414 70,268 $ 64,910 $ 62,041
Accumulated impairment [member] | 12-month expected credit losses [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 2,017,308 1,924,795    
Accumulated impairment [member] | 12-month expected credit losses [member] | Loan commitments and financial guarantee contracts [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 62,509 61,637 58,160 45,916
Accumulated impairment [member] | Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 1,250,965 1,315,930    
Accumulated impairment [member] | Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] | Loan commitments and financial guarantee contracts [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 7,671 7,682 6,461 10,097
Accumulated impairment [member] | Lifetime expected credit losses [member] | Financial instruments credit-impaired [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 7,018,695 7,081,394    
Accumulated impairment [member] | Lifetime expected credit losses [member] | Financial instruments credit-impaired [member] | Loan commitments and financial guarantee contracts [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 2,234 949 289 6,028
Other accounts receivable, general approach | Accumulated impairment [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 170,930 186,282 185,301 165,159
Other accounts receivable, general approach | Accumulated impairment [member] | 12-month expected credit losses [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 31,226 25,965 24,977 18,939
Other accounts receivable, general approach | Accumulated impairment [member] | Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 22,196 19,188 20,201 16,771
Other accounts receivable, general approach | Accumulated impairment [member] | Lifetime expected credit losses [member] | Financial instruments credit-impaired [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 117,508 141,129 140,123 129,449
Other accounts receivable, simplified approach | Accumulated impairment [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 191,041 199,382    
Other accounts receivable, simplified approach | Accumulated impairment [member] | Lifetime expected credit losses [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 191,041 199,382 197,115 217,643
Investment securities at fair value [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets (28,472,926) (24,446,014)    
Financial assets at amortised cost, category [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets (251,981,889) (236,970,165)    
Financial assets at amortised cost, category [member] | Accumulated impairment [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 10,387,285 10,438,261    
Financial assets at amortised cost, category [member] | Accumulated impairment [member] | 12-month expected credit losses [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 1,936,489 1,850,186    
Financial assets at amortised cost, category [member] | Accumulated impairment [member] | Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 1,243,294 1,308,248    
Financial assets at amortised cost, category [member] | Accumulated impairment [member] | Lifetime expected credit losses [member] | Financial instruments credit-impaired [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 7,016,461 7,080,445    
Financial assets at amortised cost, category [member] | Loan portfolio [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets (190,129,486) (176,168,055)    
Financial assets at amortised cost, category [member] | Loan portfolio [member] | Accumulated depreciation, amortisation and impairment [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 10,006,639 10,035,715    
Financial assets at amortised cost, category [member] | Loan portfolio [member] | Accumulated impairment [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 10,006,639 10,035,715 9,197,514 11,275,612
Financial assets at amortised cost, category [member] | Loan portfolio [member] | Accumulated impairment [member] | 12-month expected credit losses [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 1,890,934 1,811,608 1,494,887 1,824,446
Financial assets at amortised cost, category [member] | Loan portfolio [member] | Accumulated impairment [member] | Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 1,216,752 1,284,791 1,425,922 2,703,117
Financial assets at amortised cost, category [member] | Loan portfolio [member] | Accumulated impairment [member] | Lifetime expected credit losses [member] | Financial instruments credit-impaired [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 6,898,953 6,939,316 6,276,705 6,748,049
Financial assets at amortised cost, category [member] | Loans to corporate entities [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets (110,756,010) (102,145,802)    
Financial assets at amortised cost, category [member] | Loans to corporate entities [member] | Accumulated impairment [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 5,363,688 5,294,622    
Financial assets at amortised cost, category [member] | Commercial lending portfolio [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets (110,051,750) (101,753,217)    
Financial assets at amortised cost, category [member] | Commercial lending portfolio [member] | Accumulated impairment [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 5,362,893 5,294,600 5,492,746 5,854,745
Financial assets at amortised cost, category [member] | Commercial lending portfolio [member] | Accumulated impairment [member] | 12-month expected credit losses [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 724,075 612,441 598,538 655,655
Financial assets at amortised cost, category [member] | Commercial lending portfolio [member] | Accumulated impairment [member] | Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 217,588 218,824 515,202 1,006,822
Financial assets at amortised cost, category [member] | Commercial lending portfolio [member] | Accumulated impairment [member] | Lifetime expected credit losses [member] | Financial instruments credit-impaired [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 4,421,230 4,463,335 4,379,006 4,192,268
Financial assets at amortised cost, category [member] | Interbank and overnight funds [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets (704,260) (392,585)    
Financial assets at amortised cost, category [member] | Interbank and overnight funds [member] | Accumulated impairment [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 795 22 1,444 2,386
Financial assets at amortised cost, category [member] | Interbank and overnight funds [member] | Accumulated impairment [member] | 12-month expected credit losses [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 794 22 1,444 2,386
Financial assets at amortised cost, category [member] | Interbank and overnight funds [member] | Accumulated impairment [member] | Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 1      
Financial assets at amortised cost, category [member] | Loans to consumers [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets (57,810,307) (55,692,165)    
Financial assets at amortised cost, category [member] | Loans to consumers [member] | Accumulated impairment [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 4,166,018 4,307,446 3,311,912 4,581,004
Financial assets at amortised cost, category [member] | Loans to consumers [member] | Accumulated impairment [member] | 12-month expected credit losses [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 1,105,918 1,141,997 839,904 1,066,543
Financial assets at amortised cost, category [member] | Loans to consumers [member] | Accumulated impairment [member] | Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 927,310 993,268 853,159 1,396,101
Financial assets at amortised cost, category [member] | Loans to consumers [member] | Accumulated impairment [member] | Lifetime expected credit losses [member] | Financial instruments credit-impaired [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 2,132,790 2,172,181 1,618,849 2,118,360
Financial assets at amortised cost, category [member] | Mortgages [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets (21,562,412) (18,106,219)    
Financial assets at amortised cost, category [member] | Mortgages [member] | Accumulated impairment [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 473,315 379,987 352,441 732,407
Financial assets at amortised cost, category [member] | Mortgages [member] | Accumulated impairment [member] | 12-month expected credit losses [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 60,088 45,080 48,763 93,122
Financial assets at amortised cost, category [member] | Mortgages [member] | Accumulated impairment [member] | Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 71,839 66,333 52,639 286,903
Financial assets at amortised cost, category [member] | Mortgages [member] | Accumulated impairment [member] | Lifetime expected credit losses [member] | Financial instruments credit-impaired [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 341,388 268,574 251,039 352,382
Financial assets at amortised cost, category [member] | Microcredit [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets (757) (223,869)    
Financial assets at amortised cost, category [member] | Microcredit [member] | Accumulated impairment [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 3,618 53,660 38,971 105,070
Financial assets at amortised cost, category [member] | Microcredit [member] | Accumulated impairment [member] | 12-month expected credit losses [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 59 12,068 6,238 6,740
Financial assets at amortised cost, category [member] | Microcredit [member] | Accumulated impairment [member] | Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 14 6,366 4,922 13,291
Financial assets at amortised cost, category [member] | Microcredit [member] | Accumulated impairment [member] | Lifetime expected credit losses [member] | Financial instruments credit-impaired [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 3,545 35,226 27,811 85,039
Financial assets at amortised cost, category [member] | Other accounts receivable at amortized cost [member] | Accumulated impairment [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 361,971 385,664    
Financial assets at amortised cost, category [member] | Other accounts receivable, general approach | Accumulated impairment [member] | 12-month expected credit losses [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 31,226 25,965    
Financial assets at amortised cost, category [member] | Other accounts receivable, general approach | Accumulated impairment [member] | Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 22,196 19,188    
Financial assets at amortised cost, category [member] | Other accounts receivable, general approach | Accumulated impairment [member] | Lifetime expected credit losses [member] | Financial instruments credit-impaired [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 117,508 141,129    
Financial assets at amortised cost, category [member] | Other accounts receivable, simplified approach | Accumulated impairment [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 191,041 199,382    
Financial assets measured at fair value through other comprehensive income, category [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets (27,050,198) (23,326,776)    
Debt securities [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 18,675 16,882 36,930 10,698
Debt securities [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member] | 12-month expected credit losses [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 14,329 12,613 28,563 3,297
Debt securities [member] | Financial assets at amortised cost, category [member] | Accumulated impairment [member] | Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 4,346 4,269 8,367 7,401
Debt securities [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Investment securities at fair value [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets (27,050,198) (23,326,776)    
Debt securities [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Investment securities at fair value [member] | 12-month expected credit losses [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets (27,050,198) (23,326,776)    
Debt securities [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Investment securities at fair value [member] | Accumulated impairment [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets 18,310 12,972 12,686 123,978
Debt securities [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Investment securities at fair value [member] | Accumulated impairment [member] | 12-month expected credit losses [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets $ 18,310 $ 12,972 $ 12,686 $ 123,978