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RISK MANAGEMENT - Investment debt securities - Concentration by location (Details) - COP ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Disclosure of financial assets [line items] |  |
Financial assets | $ 280,746,878 | $ 274,682,875
Debt securities [member] | Gross carrying amount [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 40,438,606 | 35,995,562
Debt securities [member] | Gross carrying amount [member] | Countries |  |
Disclosure of financial assets [line items] |  |
Financial assets | 40,104,308 | 35,490,736
Debt securities [member] | Gross carrying amount [member] | Colombia |  |
Disclosure of financial assets [line items] |  |
Financial assets | 33,713,283 | 28,040,520
Debt securities [member] | Gross carrying amount [member] | Panama |  |
Disclosure of financial assets [line items] |  |
Financial assets | 3,952,223 | 4,381,752
Debt securities [member] | Gross carrying amount [member] | United States |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,421,010 | 2,213,308
Debt securities [member] | Gross carrying amount [member] | Brazil |  |
Disclosure of financial assets [line items] |  |
Financial assets | 114,879 | 264,073
Debt securities [member] | Gross carrying amount [member] | Mexico |  |
Disclosure of financial assets [line items] |  |
Financial assets | 410,599 | 221,754
Debt securities [member] | Gross carrying amount [member] | Costa Rica |  |
Disclosure of financial assets [line items] |  |
Financial assets | 95,643 | 143,513
Debt securities [member] | Gross carrying amount [member] | Chile |  |
Disclosure of financial assets [line items] |  |
Financial assets | 182,398 | 115,033
Debt securities [member] | Gross carrying amount [member] | Peru |  |
Disclosure of financial assets [line items] |  |
Financial assets | 177,096 | 102,190
Debt securities [member] | Gross carrying amount [member] | Paraguay |  |
Disclosure of financial assets [line items] |  |
Financial assets | 37,177 | 8,593
Debt securities [member] | Gross carrying amount [member] | Multilateral |  |
Disclosure of financial assets [line items] |  |
Financial assets | 334,298 | 504,826
Debt securities [member] | Gross carrying amount [member] | Multilateral - Bladex (Foreign Trade Bank of Latin America) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 225,642 | 277,501
Debt securities [member] | Gross carrying amount [member] | Multilateral - Andean Development Corporation (Corporacion Andina de Fomento) |  |
Disclosure of financial assets [line items] |  |
Financial assets | 105,107 | 111,124
Debt securities [member] | Gross carrying amount [member] | Multilateral - International Bank for Reconstruction and Development |  |
Disclosure of financial assets [line items] |  |
Financial assets |  | 89,266
Debt securities [member] | Gross carrying amount [member] | Multilateral - Inter-American Corporation for the Financing of Infrastructure |  |
Disclosure of financial assets [line items] |  |
Financial assets | $ 3,549 | $ 26,935

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