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RISK MANAGEMENT - Credit quality of financial assets (excluding loan portfolio) - Investments in debt securities at amortized cost (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 at amortised cost, category [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 251,981,889 | 236,970,165
Investment securities [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 39,162,618 | 34,425,693
Investment securities [member] | Gross carrying amount [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 39,181,293 | 34,442,575
Investment securities [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 10,708,367 | 9,996,561
Debt securities [member] | Gross carrying amount [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 49,697,404 | 40,438,606
Debt securities [member] | Investment securities [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 10,708,367 | 9,996,561
Debt securities [member] | Investment securities [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Investment grade [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 4,906,250 | 4,610,056
Debt securities [member] | Investment securities [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Speculative grade [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 5,634,564 | 5,181,940
Debt securities [member] | Investment securities [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Without grade or not available [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 167,553 | 204,565
Debt securities [member] | Investment securities [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | 12-month expected credit losses [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 10,639,729 | 9,936,217
Debt securities [member] | Investment securities [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | 12-month expected credit losses [member] | Investment grade [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 4,906,250 | 4,610,056
Debt securities [member] | Investment securities [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | 12-month expected credit losses [member] | Speculative grade [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 5,634,564 | 5,181,940
Debt securities [member] | Investment securities [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | 12-month expected credit losses [member] | Without grade or not available [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 98,915 | 144,221
Debt securities [member] | Investment securities [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 68,638 | 60,344
Debt securities [member] | Investment securities [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] | Without grade or not available [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 68,638 | 60,344
Sovereign | Investment securities [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Investment grade [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 2,584,348 | 2,593,978
Sovereign | Investment securities [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | 12-month expected credit losses [member] | Investment grade [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 2,584,348 | 2,593,978
Other Public Entities | Investment securities [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Speculative grade [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 5,563,208 | 5,112,355
Other Public Entities | Investment securities [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | 12-month expected credit losses [member] | Speculative grade [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 5,563,208 | 5,112,355
Corporate | Investment securities [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Speculative grade [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 64,709 | 63,824
Corporate | Investment securities [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Without grade or not available [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 145,553 | 143,410
Corporate | Investment securities [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | 12-month expected credit losses [member] | Speculative grade [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 64,709 | 63,824
Corporate | Investment securities [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | 12-month expected credit losses [member] | Without grade or not available [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 76,915 | 83,066
Corporate | Investment securities [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] | Without grade or not available [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 68,638 | 60,344
Financial Entities | Investment securities [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Investment grade [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 2,321,902 | 2,016,078
Financial Entities | Investment securities [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Speculative grade [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 6,647 | 5,761
Financial Entities | Investment securities [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Without grade or not available [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 22,000 | 61,155
Financial Entities | Investment securities [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | 12-month expected credit losses [member] | Investment grade [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 2,321,902 | 2,016,078
Financial Entities | Investment securities [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | 12-month expected credit losses [member] | Speculative grade [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 6,647 | 5,761
Financial Entities | Investment securities [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | 12-month expected credit losses [member] | Without grade or not available [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | $ 22,000 | $ 61,155

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