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RISK MANAGEMENT - Impact of the measurement of ECL (Details) - COP ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Loan portfolio [member] |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Impact of the measurement of ECL | $ (181,238) | $ 94,543 | $ (97,739)
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] |  |  |
Impact of the measurement of ECL | (93,542) | (13,761) | 86,003
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] |  |  |
Impact of the measurement of ECL | 6 | (4) | (611)
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] |  |  |
Impact of the measurement of ECL | (89,690) | 94,656 | (92,385)
Mortgages [member] |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Impact of the measurement of ECL | 1,990 | 13,725 | (90,615)
Microcredit [member] |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Impact of the measurement of ECL | (2) | (73) | (131)
12-month expected credit losses [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] |  |  |
Impact of the measurement of ECL | (221,533) | 66,298 | (171,007)
12-month expected credit losses [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] |  |  |
Impact of the measurement of ECL | (72,973) | 3,952 | (51,598)
12-month expected credit losses [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] |  |  |
Impact of the measurement of ECL | 6 | (4) | (611)
12-month expected credit losses [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] |  |  |
Impact of the measurement of ECL | (147,090) | 57,239 | (54,668)
12-month expected credit losses [member] | Mortgages [member] |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Impact of the measurement of ECL | (1,468) | 5,207 | (63,752)
12-month expected credit losses [member] | Microcredit [member] |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Impact of the measurement of ECL | (8) | (96) | (378)
Lifetime expected credit losses [member] | Financial instruments not credit-impaired [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] |  |  |
Impact of the measurement of ECL | (1,913) | 35,139 | 42
Lifetime expected credit losses [member] | Financial instruments not credit-impaired [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] |  |  |
Impact of the measurement of ECL | (25,391) | (20,629) | 54,452
Lifetime expected credit losses [member] | Financial instruments not credit-impaired [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] |  |  |
Impact of the measurement of ECL | 20,156 | 51,135 | (37,148)
Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] | Mortgages [member] |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Impact of the measurement of ECL | 3,316 | 4,604 | (17,595)
Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] | Microcredit [member] |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Impact of the measurement of ECL | 6 | 29 | 333
Lifetime expected credit losses [member] | Financial instruments credit-impaired [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] |  |  |
Impact of the measurement of ECL | 42,208 | (6,894) | 73,226
Lifetime expected credit losses [member] | Financial instruments credit-impaired [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] |  |  |
Impact of the measurement of ECL | 4,822 | 2,916 | 83,149
Lifetime expected credit losses [member] | Financial instruments credit-impaired [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] |  |  |
Impact of the measurement of ECL | 37,244 | (13,718) | (569)
Lifetime expected credit losses [member] | Financial instruments credit-impaired [member] | Mortgages [member] |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Impact of the measurement of ECL | 142 | 3,914 | (9,268)
Lifetime expected credit losses [member] | Financial instruments credit-impaired [member] | Microcredit [member] |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Impact of the measurement of ECL |  | (6) | (86)
Debt securities [member] | 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] |  |  |
Impact of the measurement of ECL | (404) | 9,632 | (22)
Debt securities [member] | 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] |  |  |
Impact of the measurement of ECL | (90) | (359) | (1,056)
Debt securities [member] | 12-month expected credit losses [member] | 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] |  |  |
Impact of the measurement of ECL | (404) | 9,632 | (70)
Debt securities [member] | 12-month expected credit losses [member] | 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] |  |  |
Impact of the measurement of ECL | $ (90) | $ (359) | (1,056)
Debt securities [member] | Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] | 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] |  |  |
Impact of the measurement of ECL |  |  | $ 48

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