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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
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

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: 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
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-URIDate 2023-03-23

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