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RISK MANAGEMENT - Concentrations of credit risk - Concentration by sector (Details) - COP ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Disclosure of financial assets [line items] |  |  |  |
Financial assets | $ 280,746,878 | $ 274,682,875 |  |
Financial assets at amortised cost, category [member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Financial assets | 236,970,165 | 235,373,468 |  |
Loan portfolio [member] | Financial assets at amortised cost, category [member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Financial assets | 176,168,055 | 179,115,847 |  |
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Financial assets | $ 186,203,770 | $ 188,313,361 | $ 231,573,437 | $ 206,447,165
Concentration risk, percentage, financial assets (as a percent) | 100.00% | 100.00% |  |
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Consumer services |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Financial assets | $ 84,358,141 | $ 84,466,684 |  |
Concentration risk, percentage, financial assets (as a percent) | 45.30% | 44.80% |  |
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Commercial services |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Financial assets | $ 40,341,863 | $ 42,542,019 |  |
Concentration risk, percentage, financial assets (as a percent) | 21.70% | 22.60% |  |
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | IFRS Construction [Member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Financial assets | $ 14,733,390 | $ 14,438,349 |  |
Concentration risk, percentage, financial assets (as a percent) | 7.90% | 7.70% |  |
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Food, beverage and tobacco |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Financial assets | $ 7,191,477 | $ 7,843,322 |  |
Concentration risk, percentage, financial assets (as a percent) | 3.90% | 4.20% |  |
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Other industrial and manufacturing products |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Financial assets | $ 6,410,022 | $ 7,006,245 |  |
Concentration risk, percentage, financial assets (as a percent) | 3.40% | 3.70% |  |
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Transportation and communications |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Financial assets | $ 6,283,172 | $ 6,567,477 |  |
Concentration risk, percentage, financial assets (as a percent) | 3.40% | 3.50% |  |
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Public services |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Financial assets | $ 7,172,123 | $ 5,672,379 |  |
Concentration risk, percentage, financial assets (as a percent) | 3.90% | 3.00% |  |
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Chemical production |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Financial assets | $ 5,414,605 | $ 5,422,364 |  |
Concentration risk, percentage, financial assets (as a percent) | 2.90% | 2.90% |  |
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Government |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Financial assets | $ 5,367,471 | $ 5,252,429 |  |
Concentration risk, percentage, financial assets (as a percent) | 2.90% | 2.80% |  |
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Agricultural |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Financial assets | $ 4,192,847 | $ 4,448,738 |  |
Concentration risk, percentage, financial assets (as a percent) | 2.30% | 2.40% |  |
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Trade and tourism |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Financial assets | $ 1,622,212 | $ 1,650,721 |  |
Concentration risk, percentage, financial assets (as a percent) | 0.80% | 0.90% |  |
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Mining products and oil |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Financial assets | $ 1,500,686 | $ 1,226,418 |  |
Concentration risk, percentage, financial assets (as a percent) | 0.80% | 0.60% |  |
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Other [member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Financial assets | $ 1,615,761 | $ 1,776,216 |  |
Concentration risk, percentage, financial assets (as a percent) | 0.80% | 0.90% |  |

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