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INVESTMENT SECURITIES - Investments in debt securities at fair value through OCI (Details) - Financial assets measured at fair value through other comprehensive income, category [member] - Investment securities at fair value [member] - COP ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Debt securities [member] |  |
Disclosure of financial assets [line items] |  |
Cost | $ 24,517,308 | $ 25,447,717
Unrealized Gain | 178,985 | 49,657
Unrealized Losses | (1,369,517) | (3,035,569)
Fair Value | 23,326,776 | 22,461,805
ECL | 12,972 | 12,686
Securities issued or secured by Colombian Government |  |
Disclosure of financial assets [line items] |  |
Cost | 17,626,642 | 17,891,099
Unrealized Gain | 146,608 | 15,293
Unrealized Losses | (982,457) | (2,353,520)
Fair Value | 16,790,793 | 15,552,872
ECL | 7,204 | 6,845
Securities issued or secured by other Colombian Government entities |  |
Disclosure of financial assets [line items] |  |
Cost | 898,373 | 885,106
Unrealized Gain | 6,213 | 28
Unrealized Losses | (40,798) | (95,886)
Fair Value | 863,788 | 789,248
ECL | 1,183 | 1,059
Securities issued or secured by foreign Governments |  |
Disclosure of financial assets [line items] |  |
Cost | 2,717,651 | 3,734,594
Unrealized Gain | 6,385 | 17,215
Unrealized Losses | (216,998) | (355,354)
Fair Value | 2,507,038 | 3,396,455
ECL | 611 | 1,210
Securities issued or secured by central banks |  |
Disclosure of financial assets [line items] |  |
Cost | 194,480 | 242,047
Unrealized Losses | (48,991) | (47,949)
Fair Value | 145,489 | 194,098
ECL | 56 | 27
Securities issued or secured by other financial entities |  |
Disclosure of financial assets [line items] |  |
Cost | 2,159,892 | 1,718,512
Unrealized Gain | 19,370 | 304
Unrealized Losses | (36,615) | (95,912)
Fair Value | 2,142,647 | 1,622,904
ECL | 2,398 | 2,316
Securities issued or secured by non-financial sector entities |  |
Disclosure of financial assets [line items] |  |
Cost | 215,877 | 57,252
Unrealized Gain | 156 |
Unrealized Losses | (1,462) | (3,445)
Fair Value | 214,571 | 53,807
ECL | 822 | 257
Other debt securities |  |
Disclosure of financial assets [line items] |  |
Cost | 704,393 | 919,107
Unrealized Gain | 253 | 16,817
Unrealized Losses | (42,196) | (83,503)
Fair Value | 662,450 | 852,421
ECL | $ 698 | $ 972

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