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EMPLOYEE BENEFITS - Future benefit payments (Details) - COP ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Post-Employment benefits |  |
Disclosure of defined benefit plans [line items] |  |
Estimate of contributions expected to be paid to plan for next annual reporting period | $ 488,247 |
Weighted average duration of defined benefit obligation | 5 years 10 months 20 days | 5 years 6 months 7 days
Post-Employment benefits | Not later than one year [member] |  |
Disclosure of defined benefit plans [line items] |  |
Estimate of contributions expected to be paid to plan for next annual reporting period | $ 61,487 |
Post-Employment benefits | Later than one year and not later than two years [member] |  |
Disclosure of defined benefit plans [line items] |  |
Estimate of contributions expected to be paid to plan for next annual reporting period | 56,004 |
Post-Employment benefits | Later than two years and not later than three years [member] |  |
Disclosure of defined benefit plans [line items] |  |
Estimate of contributions expected to be paid to plan for next annual reporting period | 52,583 |
Post-Employment benefits | Later than three years and not later than four years [member] |  |
Disclosure of defined benefit plans [line items] |  |
Estimate of contributions expected to be paid to plan for next annual reporting period | 51,751 |
Post-Employment benefits | Later than four years and not later than five years [member] |  |
Disclosure of defined benefit plans [line items] |  |
Estimate of contributions expected to be paid to plan for next annual reporting period | 48,748 |
Post-Employment benefits | Later than five years [member] |  |
Disclosure of defined benefit plans [line items] |  |
Estimate of contributions expected to be paid to plan for next annual reporting period | 217,674 |
Long-Term Benefits |  |
Disclosure of defined benefit plans [line items] |  |
Estimate of contributions expected to be paid to plan for next annual reporting period | $ 219,778 |
Weighted average duration of defined benefit obligation | 4 years 2 months 1 day | 3 years 9 months
Long-Term Benefits | Not later than one year [member] |  |
Disclosure of defined benefit plans [line items] |  |
Estimate of contributions expected to be paid to plan for next annual reporting period | $ 32,940 |
Long-Term Benefits | Later than one year and not later than two years [member] |  |
Disclosure of defined benefit plans [line items] |  |
Estimate of contributions expected to be paid to plan for next annual reporting period | 25,538 |
Long-Term Benefits | Later than two years and not later than three years [member] |  |
Disclosure of defined benefit plans [line items] |  |
Estimate of contributions expected to be paid to plan for next annual reporting period | 26,331 |
Long-Term Benefits | Later than three years and not later than four years [member] |  |
Disclosure of defined benefit plans [line items] |  |
Estimate of contributions expected to be paid to plan for next annual reporting period | 24,272 |
Long-Term Benefits | Later than four years and not later than five years [member] |  |
Disclosure of defined benefit plans [line items] |  |
Estimate of contributions expected to be paid to plan for next annual reporting period | 23,559 |
Long-Term Benefits | Later than five years [member] |  |
Disclosure of defined benefit plans [line items] |  |
Estimate of contributions expected to be paid to plan for next annual reporting period | $ 87,138 |

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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. + Details
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- Definition The estimate of the expected contributions to be made to a defined benefit plan for the next annual reporting period. [Refer: Defined benefit plans [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 147 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_147_b&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 148 -Subparagraph d -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_148_d_iii&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The weighted average duration of a defined benefit obligation. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 147 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_147_c&doctype=Standard -URIDate 2024-03-27 + Details
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