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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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 | $ 94,543 | $ (97,739) | $ 654,734
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 | (13,761) | 86,003 | 651,534
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 | (4) | (611) | 77
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 | 94,656 | (92,385) | (24,985)
Mortgage [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 | 13,725 | (90,615) | 45,447
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 | (73) | (131) | (17,339)
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 | 66,298 | (171,007) | (73,359)
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 | 3,952 | (51,598) | 26,567
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 | (4) | (611) | 77
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 | 57,239 | (54,668) | (97,455)
12-month expected credit losses [member] | Mortgage [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 | 5,207 | (63,752) | 7,918
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 | (96) | (378) | (10,466)
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 | 35,139 | 42 | 588,507
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 | (20,629) | 54,452 | 539,703
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 | 51,135 | (37,148) | 56,801
Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] | Mortgage [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 | 4,604 | (17,595) | (1,149)
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 | 29 | 333 | (6,848)
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 | (6,894) | 73,226 | 139,586
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 | 2,916 | 83,149 | 85,264
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 | (13,718) | (569) | 15,669
Lifetime expected credit losses [member] | Financial instruments credit-impaired [member] | Mortgage [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 | 3,914 | (9,268) | 38,678
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) | (25)
Debt securities [member] | Financial assets at amortised cost, class [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 | 9,632 | (22) | (225)
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 | (359) | (1,056) | (12,852)
Debt securities [member] | 12-month expected credit losses [member] | Financial assets at amortised cost, class [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 | 9,632 | (70) | (225)
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 | $ (359) | (1,056) | $ (12,852)
Debt securities [member] | Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] | Financial assets at amortised cost, class [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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