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ESTIMATION OF FAIR VALUE - Investment in debt securities pledged as collateral (Details) - Financial assets measured at fair value through other comprehensive income, category [member] - COP ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Debt securities [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral | $ 10,190,595 | $ 10,789,962
Pledged in money market operations | Debt securities [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral | 9,554,188 | 9,710,403
Pledged in money market operations | Securities issued or secured by central banks |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral | 18,670 | 15,185
Pledged in money market operations | Securities issued or secured by foreign Governments |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral | 1,195,671 | 702,885
Pledged in money market operations | Securities issued or secured by Colombian Government |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral | 8,113,512 | 8,644,027
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 | 24,260 | 55,249
Pledged in money market operations | Securities issued or secured by other financial entities |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral | 37,767 | 18,479
Pledged in money market operations | Securities issued or secured by non-financial sector entities |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral |  | 118,865
Pledged in money market operations | Other debt securities |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral | 164,308 | 155,713
Pledged as collateral in operations with derivative instruments | Debt securities [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral |  | 3,650
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 |  | 3,650
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 | 636,407 | 1,075,909
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 | 636,407 | 1,075,909
Level 1 of fair value hierarchy [member] | Debt securities [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral | 8,656,735 | 10,328,854
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 | 8,233,618 | 9,249,295
Level 1 of fair value hierarchy [member] | Pledged in money market operations | Securities issued or secured by foreign Governments |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral | 862,930 | 662,623
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 | 7,353,270 | 8,571,208
Level 1 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 | 17,418 | 15,464
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 |  | 3,650
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 |  | 3,650
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 | 423,117 | 1,075,909
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 | 423,117 | 1,075,909
Level 2 of fair value hierarchy [member] | Debt securities [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral | 1,533,860 | 461,108
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 | 1,320,570 | 461,108
Level 2 of fair value hierarchy [member] | Pledged in money market operations | Securities issued or secured by central banks |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral | 18,670 | 15,185
Level 2 of fair value hierarchy [member] | Pledged in money market operations | Securities issued or secured by foreign Governments |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral | 332,741 | 40,262
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 | 760,242 | 72,819
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 | 6,842 | 39,785
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 | 37,767 | 18,479
Level 2 of fair value hierarchy [member] | Pledged in money market operations | Securities issued or secured by non-financial sector entities |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral |  | 118,865
Level 2 of fair value hierarchy [member] | Pledged in money market operations | Other debt securities |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral | 164,308 | $ 155,713
Level 2 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 | 213,290 |
Level 2 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 | $ 213,290 |

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- Definition The amount of financial assets that the entity has pledged as collateral for liabilities or contingent liabilities, including amounts that have been reclassified in accordance with paragraph 3.2.23(a) of IFRS 9. [Refer: Classes of contingent liabilities [domain]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 14 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_14_a&doctype=Standard -URIDate 2024-03-27 + Details
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