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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
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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

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