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RISK MANAGEMENT - Credit quality of financial assets (excluding loan portfolio) - Investments in debt securities at FVOCI (Details) - COP ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure of financial assets [line items] |  |
Financial assets | $ 304,853,883 | $ 280,746,878
Financial assets measured at fair value through other comprehensive income, category [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 27,050,198 | 23,326,776
Investment securities at fair value [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 28,472,926 | 24,446,014
Debt securities [member] | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 27,050,198 | 23,326,776
Debt securities [member] | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Investment grade [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 21,663,653 | 18,659,060
Debt securities [member] | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Speculative grade [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 5,128,206 | 4,491,773
Debt securities [member] | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Without grade or not available [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 258,339 | 175,943
Debt securities [member] | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | 12-month expected credit losses [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 27,050,198 | 23,326,776
Debt securities [member] | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | 12-month expected credit losses [member] | Investment grade [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 21,663,653 | 18,659,060
Debt securities [member] | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | 12-month expected credit losses [member] | Speculative grade [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 5,128,206 | 4,491,773
Debt securities [member] | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | 12-month expected credit losses [member] | Without grade or not available [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 258,339 | 175,943
Sovereign | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Investment grade [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 19,577,886 | 16,879,453
Sovereign | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Speculative grade [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 3,192,832 | 2,418,378
Sovereign | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | 12-month expected credit losses [member] | Investment grade [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 19,577,886 | 16,879,453
Sovereign | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | 12-month expected credit losses [member] | Speculative grade [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 3,192,832 | 2,418,378
Other Public Entities | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Investment grade [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 33,584 | 123,996
Other Public Entities | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Speculative grade [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 429,161 | 739,792
Other Public Entities | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | 12-month expected credit losses [member] | Investment grade [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 33,584 | 123,996
Other Public Entities | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | 12-month expected credit losses [member] | Speculative grade [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 429,161 | 739,792
Central Banks | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Investment grade [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 204,855 | 145,489
Central Banks | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | 12-month expected credit losses [member] | Investment grade [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 204,855 | 145,489
Corporate | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Investment grade [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 66,347 | 93,637
Corporate | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Speculative grade [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 367,087 | 273,144
Corporate | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Without grade or not available [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 214,110 | 175,943
Corporate | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | 12-month expected credit losses [member] | Investment grade [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 66,347 | 93,637
Corporate | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | 12-month expected credit losses [member] | Speculative grade [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 367,087 | 273,144
Corporate | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | 12-month expected credit losses [member] | Without grade or not available [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 214,110 | 175,943
Financial Entities | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Investment grade [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,447,702 | 1,085,737
Financial Entities | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Speculative grade [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,134,852 | 1,056,910
Financial Entities | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Without grade or not available [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 44,229 |
Financial Entities | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | 12-month expected credit losses [member] | Investment grade [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,447,702 | 1,085,737
Financial Entities | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | 12-month expected credit losses [member] | Speculative grade [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,134,852 | 1,056,910
Financial Entities | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | 12-month expected credit losses [member] | Without grade or not available [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 44,229 |
Multilaterals | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Investment grade [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 333,279 | 330,748
Multilaterals | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Speculative grade [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 4,274 | 3,549
Multilaterals | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | 12-month expected credit losses [member] | Investment grade [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 333,279 | 330,748
Multilaterals | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | 12-month expected credit losses [member] | Speculative grade [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | $ 4,274 | $ 3,549

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