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RISK MANAGEMENT - Credit risk model - Loss allowance (Details) - COP ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets $ (280,746,878) $ (274,682,875)    
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 10,521,501 9,694,456    
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 70,268 64,910 $ 62,041 $ 67,393
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 1,924,795 1,619,273    
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 61,637 58,160 45,916 57,226
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 1,315,930 1,460,951    
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 7,682 6,461 10,097 8,679
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 7,081,394 6,417,117    
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 949 289 6,028 1,488
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 186,282 185,301 165,159 139,155
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 25,965 24,977 18,939 18,136
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 19,188 20,201 16,771 13,548
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 141,129 140,123 129,449 107,471
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 199,382 197,115    
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 199,382 197,115 217,643 203,902
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 (24,446,014) (23,939,915)    
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 (236,970,165) (235,373,468)    
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 10,438,261 9,616,860    
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 1,850,186 1,548,427    
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 1,308,248 1,454,490    
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 7,080,445 6,416,828    
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 (176,168,055) (179,115,847)    
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 10,035,715 9,197,514 11,275,612 10,905,171
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 1,811,608 1,494,887 1,824,446 1,760,076
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 1,284,791 1,425,922 2,703,117 3,039,056
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 6,939,316 6,276,705 6,748,049 6,106,039
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 (102,145,802) (105,248,652)    
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 5,294,622 5,494,190    
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 (101,753,217) (99,282,353)    
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 5,294,600 5,492,746 5,854,745 5,280,406
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 612,441 598,538 655,655 656,830
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 218,824 515,202 1,006,822 805,097
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 4,463,335 4,379,006 4,192,268 3,818,479
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 (392,585) (5,966,299)    
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 22 1,444 2,386 851
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 22 1,444 2,386 792
Financial assets at amortised cost, category [member] | Interbank and overnight funds [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       59
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 (55,692,165) (56,107,532)    
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 4,307,446 3,311,912 4,581,004 4,938,971
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 1,141,997 839,904 1,066,543 1,013,071
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 993,268 853,159 1,396,101 1,948,030
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 2,172,181 1,618,849 2,118,360 1,977,870
Financial assets at amortised cost, category [member] | Mortgage [member]        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Financial assets (18,106,219) (17,530,914)    
Financial assets at amortised cost, category [member] | Mortgage [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 379,987 352,441 732,407 560,904
Financial assets at amortised cost, category [member] | Mortgage [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 45,080 48,763 93,122 72,294
Financial assets at amortised cost, category [member] | Mortgage [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 66,333 52,639 286,903 225,889
Financial assets at amortised cost, category [member] | Mortgage [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 268,574 251,039 352,382 262,721
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 (223,869) (228,749)    
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 53,660 38,971 105,070 124,039
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 12,068 6,238 6,740 17,089
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 6,366 4,922 13,291 60,040
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 35,226 27,811 85,039 46,910
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 385,664 382,416    
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 25,965 24,977    
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 19,188 20,201    
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 141,129 140,123    
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 199,382 197,115    
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 (23,326,776) (22,461,805)    
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 16,882 36,930 10,698 7,195
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 12,613 28,563 3,297 7,188
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 4,269 8,367 7,401 7
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 (23,326,776) (22,461,805)    
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 (23,326,776) (22,461,805)    
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 12,972 12,686 123,978 96,486
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 $ 12,972 $ 12,686 $ 123,978 96,307
Debt securities [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Investment securities at fair value [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       $ 179