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ESTIMATION OF FAIR VALUE - Trading assets in debt securities pledged as collateral (Details) - Financial assets at fair value through profit or loss, classified as held for trading, category, International Financial Reporting Standards 9 [member] - COP ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Debt securities [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral | $ 2,853,286 | $ 2,000,025
Pledged in money market operations | Debt securities [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral | 2,774,296 | 1,946,580
Pledged in money market operations | Securities issued or secured by Colombian Government |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral | 2,702,953 | 1,940,594
Pledged in money market operations | Securities issued or secured by other Colombian Government entities |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral |  | 1,006
Pledged in money market operations | Securities issued or secured by other financial entities |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral | 71,343 | 4,980
Pledged as collateral to special entities such as CRCC, BR and BVC | Debt securities [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral | 78,990 | 52,153
Pledged as collateral to special entities such as CRCC, BR and BVC | Securities issued or secured by Colombian Government |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral | 78,990 | 52,153
Pledged as collateral in operations with derivative instruments | Debt securities [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral |  | 1,292
Pledged as collateral in operations with derivative instruments | Securities issued or secured by Colombian Government |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral |  | 1,292
Level 1 of fair value hierarchy [member] | Debt securities [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral | 2,781,943 | 1,856,741
Level 1 of fair value hierarchy [member] | Pledged in money market operations | Debt securities [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral | 2,702,953 | 1,803,296
Level 1 of fair value hierarchy [member] | Pledged in money market operations | Securities issued or secured by Colombian Government |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral | 2,702,953 | 1,803,296
Level 1 of fair value hierarchy [member] | Pledged as collateral to special entities such as CRCC, BR and BVC | Debt securities [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral | 78,990 | 52,153
Level 1 of fair value hierarchy [member] | Pledged as collateral to special entities such as CRCC, BR and BVC | Securities issued or secured by Colombian Government |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral | 78,990 | 52,153
Level 1 of fair value hierarchy [member] | Pledged as collateral in operations with derivative instruments | Debt securities [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral |  | 1,292
Level 1 of fair value hierarchy [member] | Pledged as collateral in operations with derivative instruments | Securities issued or secured by Colombian Government |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral |  | 1,292
Level 2 of fair value hierarchy [member] | Debt securities [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral | 71,343 | 143,284
Level 2 of fair value hierarchy [member] | Pledged in money market operations | Debt securities [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral | 71,343 | 143,284
Level 2 of fair value hierarchy [member] | Pledged in money market operations | Securities issued or secured by Colombian Government |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral |  | 137,298
Level 2 of fair value hierarchy [member] | Pledged in money market operations | Securities issued or secured by other Colombian Government entities |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral |  | 1,006
Level 2 of fair value hierarchy [member] | Pledged in money market operations | Securities issued or secured by other financial entities |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral | $ 71,343 | $ 4,980

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