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RISK MANAGEMENT - Loans individually evaluated for impairment (Details) - COP ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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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
Financial instruments credit-impaired [member] | Lifetime expected credit losses [member] | Expected credit losses individually assessed [member] |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |
Financial assets, loans, collateral guarantees | 1,317,353 | 1,693,275
Financial instruments credit-impaired [member] | Lifetime expected credit losses [member] | Without recognized provision | Expected credit losses individually assessed [member] |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |
Financial assets, loans, collateral guarantees | 239,937 | 138,324
Financial instruments credit-impaired [member] | Lifetime expected credit losses [member] | With recognized provision | Expected credit losses individually assessed [member] |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |
Financial assets, loans, collateral guarantees | 1,077,416 | 1,554,951
Commercial lending portfolio [member] | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member] | Expected credit losses individually assessed [member] |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |
Financial assets, loans, collateral guarantees | 1,315,383 | 1,692,996
Commercial lending portfolio [member] | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member] | Without recognized provision | Expected credit losses individually assessed [member] |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |
Financial assets, loans, collateral guarantees | 239,937 | 138,324
Commercial lending portfolio [member] | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member] | With recognized provision | Expected credit losses individually assessed [member] |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |
Financial assets, loans, collateral guarantees | 1,075,446 | 1,554,672
Loans to consumers [member] | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member] | Expected credit losses individually assessed [member] |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |
Financial assets, loans, collateral guarantees |  | 279
Loans to consumers [member] | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member] | With recognized provision | Expected credit losses individually assessed [member] |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |
Financial assets, loans, collateral guarantees |  | 279
Mortgage [member] | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member] | Expected credit losses individually assessed [member] |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |
Financial assets, loans, collateral guarantees | 1,970 |
Mortgage [member] | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member] | With recognized provision | Expected credit losses individually assessed [member] |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |
Financial assets, loans, collateral guarantees | 1,970 |
Gross carrying amount [member] | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member] | Expected credit losses individually assessed [member] |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |
Financial assets | 7,336,775 | 7,604,642
Gross carrying amount [member] | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member] | Without recognized provision | Expected credit losses individually assessed [member] |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |
Financial assets | 240,358 | 143,728
Gross carrying amount [member] | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member] | With recognized provision | Expected credit losses individually assessed [member] |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |
Financial assets | 7,096,417 | 7,460,914
Gross carrying amount [member] | Commercial lending portfolio [member] | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member] | Expected credit losses individually assessed [member] |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |
Financial assets | 7,321,116 | 7,587,745
Gross carrying amount [member] | Commercial lending portfolio [member] | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member] | Without recognized provision | Expected credit losses individually assessed [member] |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |
Financial assets | 240,358 | 143,728
Gross carrying amount [member] | Commercial lending portfolio [member] | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member] | With recognized provision | Expected credit losses individually assessed [member] |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |
Financial assets | 7,080,758 | 7,444,017
Gross carrying amount [member] | Loans to consumers [member] | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member] | Expected credit losses individually assessed [member] |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |
Financial assets | 3,144 | 5,913
Gross carrying amount [member] | Loans to consumers [member] | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member] | With recognized provision | Expected credit losses individually assessed [member] |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |
Financial assets | 3,144 | 5,913
Gross carrying amount [member] | Mortgage [member] | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member] | Expected credit losses individually assessed [member] |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |
Financial assets | 12,515 | 10,983
Gross carrying amount [member] | Mortgage [member] | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member] | With recognized provision | Expected credit losses individually assessed [member] |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |
Financial assets | 12,515 | 10,983
Gross carrying amount [member] | Repos, interbank loans portfolio [member] | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member] | Expected credit losses individually assessed [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
Gross carrying amount [member] | Repos, interbank loans portfolio [member] | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member] | With recognized provision | Expected credit losses individually assessed [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
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] | Financial instruments credit-impaired [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 | (7,081,394) | (6,417,117)
Accumulated impairment [member] | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member] | Expected credit losses individually assessed [member] |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |
Financial assets | (3,209,266) | (3,340,570)
Accumulated impairment [member] | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member] | With recognized provision | Expected credit losses individually assessed [member] |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |
Financial assets | (3,209,266) | (3,340,570)
Accumulated impairment [member] | Commercial lending portfolio [member] | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member] | Expected credit losses individually assessed [member] |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |
Financial assets | (3,196,800) | (3,332,063)
Accumulated impairment [member] | Commercial lending portfolio [member] | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member] | With recognized provision | Expected credit losses individually assessed [member] |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |
Financial assets | (3,196,800) | (3,332,063)
Accumulated impairment [member] | Loans to consumers [member] | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member] | Expected credit losses individually assessed [member] |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |
Financial assets | (1,959) | (2,337)
Accumulated impairment [member] | Loans to consumers [member] | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member] | With recognized provision | Expected credit losses individually assessed [member] |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |
Financial assets | (1,959) | (2,337)
Accumulated impairment [member] | Mortgage [member] | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member] | Expected credit losses individually assessed [member] |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |
Financial assets | (10,507) | (6,170)
Accumulated impairment [member] | Mortgage [member] | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member] | With recognized provision | Expected credit losses individually assessed [member] |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |
Financial assets | $ (10,507) | $ (6,170)

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