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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
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

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

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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

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