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EMPLOYEE BENEFITS - Future benefit payments (Details) - COP ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Post-Employment benefits |  |
Disclosure of defined benefit plans [line items] |  |
Estimate of contributions expected to be paid to plan for next annual reporting period | $ 525,823 |
Weighted average duration of defined benefit obligation | 5 years 6 months 7 days | 4 years 7 months 13 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 | $ 57,922 |
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 | 58,572 |
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 | 57,227 |
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 | 54,944 |
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 | 53,979 |
Post-Employment benefits | More than 5 years [member] |  |
Disclosure of defined benefit plans [line items] |  |
Estimate of contributions expected to be paid to plan for next annual reporting period | 243,179 |
Long-Term Benefits |  |
Disclosure of defined benefit plans [line items] |  |
Estimate of contributions expected to be paid to plan for next annual reporting period | $ 202,924 |
Weighted average duration of defined benefit obligation | 3 years 9 months | 3 years 6 months 21 days
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 | $ 31,798 |
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 | 27,668 |
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 | 22,014 |
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 | 22,121 |
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 | 19,934 |
Long-Term Benefits | More than 5 years [member] |  |
Disclosure of defined benefit plans [line items] |  |
Estimate of contributions expected to be paid to plan for next annual reporting period | $ 79,389 |

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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 [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 147 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_147_b&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 148 -Subparagraph d -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_148_d_iii&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 147 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_147_c&doctype=Standard -URIDate 2023-03-23 + Details
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