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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, 2023 | Dec. 31, 2022
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Debt securities [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral | $ 10,789,962 | $ 7,723,412
Pledged in money market operations | Debt securities [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral | 9,710,403 | 6,567,488
Pledged in money market operations | Securities issued or secured by central banks |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral | 15,185 | 39,212
Pledged in money market operations | Securities issued or secured by foreign Governments |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral | 702,885 | 1,651,796
Pledged in money market operations | Securities issued or secured by Colombian Government |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral | 8,644,027 | 4,414,866
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 | 55,249 | 175,521
Pledged in money market operations | Securities issued or secured by other financial entities |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral | 18,479 | 89,982
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 | 32,955
Pledged in money market operations | Other debt securities |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral | 155,713 | 163,156
Pledged as collateral in operations with derivative instruments | Debt securities [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral | 3,650 | 10,177
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 | 10,177
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 | 1,075,909 | 1,145,747
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 | 1,075,909 | 1,145,747
Level 1 of fair value hierarchy [member] | Debt securities [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral | 10,328,854 | 6,389,380
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 | 9,249,295 | 5,233,456
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 | 662,623 | 1,376,551
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 | 8,571,208 | 3,718,431
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 | 15,464 | 138,474
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 | 10,177
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 | 10,177
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 | 1,075,909 | 1,145,747
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 | 1,075,909 | 1,145,747
Level 2 of fair value hierarchy [member] | Debt securities [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets pledged as collateral | 461,108 | 1,334,032
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 | 461,108 | 1,334,032
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 | 15,185 | 39,212
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 | 40,262 | 275,245
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 | 72,819 | 696,435
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 | 39,785 | 37,047
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 | 18,479 | 89,982
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 | 32,955
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 | $ 155,713 | $ 163,156

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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: Contingent liabilities [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 14 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_14_a&doctype=Standard -URIDate 2023-03-23 + Details
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