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INCOME TAX - Estimates to recover income tax assets and settle income tax liabilities - Deferred tax (Details) - COP ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Deferred tax assets and liabilities [abstract] |  |  |  |
Deferred tax (liability) asset, net | $ (3,988,263) | $ (4,265,728) | $ (3,211,452) | $ (2,567,101)
Deferred tax assets [member] |  |  |  |
Deferred tax assets and liabilities [abstract] |  |  |  |
Deferred tax (liability) asset, net | 7,527,728 | 6,642,821 | 7,669,219 | 6,171,791
Deferred tax assets [member] | Later than one year [member] |  |  |  |
Deferred tax assets and liabilities [abstract] |  |  |  |
Deferred tax (liability) asset, net | 1,238,172 | 1,720,235 |  |
Deferred tax assets [member] | Not later than one year [member] |  |  |  |
Deferred tax assets and liabilities [abstract] |  |  |  |
Deferred tax (liability) asset, net | 6,289,556 | 4,922,586 |  |
Deferred tax liabilities [member] |  |  |  |
Deferred tax assets and liabilities [abstract] |  |  |  |
Deferred tax (liability) asset, net | (11,515,991) | (10,908,549) | $ (10,880,671) | $ (8,738,892)
Deferred tax liabilities [member] | Later than one year [member] |  |  |  |
Deferred tax assets and liabilities [abstract] |  |  |  |
Deferred tax (liability) asset, net | (1,082,965) | (999,487) |  |
Deferred tax liabilities [member] | Not later than one year [member] |  |  |  |
Deferred tax assets and liabilities [abstract] |  |  |  |
Deferred tax (liability) asset, net | $ (10,433,026) | $ (9,909,062) |  |

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- Definition The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2024-03-27 + Details
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