INVESTMENT SECURITIES - Investments in debt securities mandatorily at FVTPL (Details) - COP ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Disclosure of financial assets [line items]
Financial assets	$ 343,332,362	$ 303,076,129
Financial assets at fair value through profit or loss, category [member]
Disclosure of financial assets [line items]
Financial assets	14,259,498	14,160,846
Investment securities at fair value [member]
Disclosure of financial assets [line items]
Financial assets	$ 38,900,001	30,488,831
Debt securities [member] \| Investment securities at fair value [member] \| Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member]
Disclosure of financial assets [line items]
Financial assets		7,385
Other debt securities \| Investment securities at fair value [member] \| Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member]
Disclosure of financial assets [line items]
Financial assets		$ 7,385

- Definition

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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