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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, 2023 | Dec. 31, 2022
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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
Investment securities [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 34,425,693 | 33,674,477
Investment securities [member] | Gross carrying amount [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 34,442,575 | 33,711,407
Investment securities [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 9,996,561 | 9,771,492
Debt securities [member] | Gross carrying amount [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 40,438,606 | 35,995,562
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 | 9,996,561 | 9,771,492
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 | 4,610,056 | 2,362,096
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 | 5,181,940 | 7,102,559
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 | 204,565 | 306,837
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 | 9,936,217 | 9,665,844
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 | 4,610,056 | 2,362,096
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 | 5,181,940 | 7,102,559
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 | 144,221 | 201,189
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 | 60,344 | 105,648
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 | 60,344 | 105,648
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 | 2,593,978 | 2,333,070
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 | 2,593,978 | 2,333,070
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 | 5,112,355 | 4,509,839
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 | 5,112,355 | 4,509,839
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 | 63,824 | 72,390
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 | 143,410 | 237,537
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 | 63,824 | 72,390
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 | 83,066 | 157,338
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 | 60,344 | 80,199
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 | 2,016,078 | 29,026
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 | 5,761 | 2,520,330
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 | 61,155 | 69,300
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 | 2,016,078 | 29,026
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 | 5,761 | 2,520,330
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 | $ 61,155 | 43,851
Financial Entities | 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 |  | $ 25,449

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