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ANALYSIS OF OPERATING SEGMENTS - Revenue from contracts with customers (Details) - COP ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of operating segments [line items] |  |  |
Revenue from contracts with customers | $ 15,664,744 | $ 15,579,892 | $ 16,015,766
Goods or services transferred at point in time [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue from contracts with customers | 752,551 | 606,015 | 567,374
Goods or services transferred over time [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue from contracts with customers | 14,912,193 | 14,973,877 | 15,448,392
Operating segments [member] | Banking Services |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue from contracts with customers | 3,465,811 | 3,383,055 | 3,003,635
Operating segments [member] | Banking Services | Goods or services transferred at point in time [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue from contracts with customers | 165,173 | 142,134 | 318,011
Operating segments [member] | Banking Services | Goods or services transferred over time [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue from contracts with customers | 3,300,638 | 3,240,921 | 2,685,624
Operating segments [member] | Merchant Banking |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue from contracts with customers | 11,018,584 | 11,207,150 | 12,117,232
Operating segments [member] | Merchant Banking | Goods or services transferred at point in time [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue from contracts with customers | 523,221 | 400,146 | 193,572
Operating segments [member] | Merchant Banking | Goods or services transferred over time [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue from contracts with customers | 10,495,363 | 10,807,004 | 11,923,660
Operating segments [member] | Pension and Severance Fund Management |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue from contracts with customers | 1,269,914 | 1,063,588 | 956,465
Operating segments [member] | Pension and Severance Fund Management | Goods or services transferred at point in time [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue from contracts with customers | 84,808 | 75,527 | 62,743
Operating segments [member] | Pension and Severance Fund Management | Goods or services transferred over time [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue from contracts with customers | 1,185,106 | 988,061 | 893,722
Operating segments [member] | Holding |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue from contracts with customers | 284,991 | 292,641 | 282,924
Operating segments [member] | Holding | Goods or services transferred at point in time [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue from contracts with customers | 284,991 | 292,641 | 282,924
Elimination of intersegment amounts [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue from contracts with customers | (374,556) | (366,542) | (344,490)
Elimination of intersegment amounts [member] | Goods or services transferred at point in time [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue from contracts with customers | (305,642) | (304,433) | (289,876)
Elimination of intersegment amounts [member] | Goods or services transferred over time [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue from contracts with customers | $ (68,914) | $ (62,109) | $ (54,614)

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- Definition The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2024-01-01 -Paragraph 114 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2024-en-r&anchor=para_114&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2024-01-01 -Paragraph 113 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2024-en-r&anchor=para_113_a&doctype=Standard -URIDate 2024-03-27 + Details
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