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RISK MANAGEMENT - Identifiable collateral (Details) - Commercial lending portfolio [member] - COP ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Disclosure of financial assets [line items] |  |
Financial assets, identifiable collateral, carrying amount | $ 26,436,467 | $ 25,112,420
Financial assets, identifiable collateral, fair value | 18,425,401 | 18,221,974
Twelve-month expected credit losses and lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets, identifiable collateral, carrying amount | 23,484,250 | 22,537,899
Financial assets, identifiable collateral, fair value | 15,996,375 | 15,742,699
Lifetime expected credit losses [member] | Financial instruments credit-impaired [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets, identifiable collateral, carrying amount | 2,952,217 | 2,574,521
Financial assets, identifiable collateral, fair value | $ 2,429,026 | $ 2,479,275

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