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INVESTMENT SECURITIES - Investments in equity securities at fair value through OCI (Details) - Investments in equity instruments designated at fair value through other comprehensive income [member] - Equity investments [member] - Investment securities at fair value [member] - COP ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Disclosure of financial assets [line items] |  |
Cost | $ 597,035 | $ 594,578
Unrealized Gain | 836,645 | 561,580
Unrealized Losses | (12,377) | (38,809)
Fair Value | 1,421,303 | 1,117,349
Colombia, Pesos |  |
Disclosure of financial assets [line items] |  |
Cost | 546,822 | 585,351
Unrealized Gain | 832,222 | 121,018
Unrealized Losses | (2,799) | (33,137)
Fair Value | 1,376,245 | 673,232
Foreign currency [member] |  |
Disclosure of financial assets [line items] |  |
Cost | 50,213 | 9,227
Unrealized Gain | 4,423 | 440,562
Unrealized Losses | (9,578) | (5,672)
Fair Value | $ 45,058 | $ 444,117

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