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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
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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The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities]

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