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INCOME TAX - Reconciliation between total expenses of income tax and tax expense - General information (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2027 item | Dec. 31, 2026 item | Dec. 31, 2025 item | Dec. 31, 2024 COP ($) item | Dec. 31, 2023 COP ($) item | Dec. 31, 2022 COP ($) item
Disclosure of income tax [line items] |  |  |  |  |  |
Applicable tax rate (as a percent) |  |  |  | 40.00% | 40.00% | 38.00%
Individual value of Tax Value Unit | $ |  |  |  | $ 47,065 | $ 42,412 | $ 38,004
Probability percentage of industry and commerce tax paid |  |  |  | 100.00% | 100.00% |
Dividend withholding tax rate |  |  |  | 10.00% | 10.00% |
Bottom of range |  |  |  |  |  |
Disclosure of income tax [line items] |  |  |  |  |  |
Required percentage of increase in net income tax to get audit benefit |  |  |  | 25.00% |  |
Top of range |  |  |  |  |  |
Disclosure of income tax [line items] |  |  |  |  |  |
Required percentage of increase in net income tax to get audit benefit |  |  |  | 35.00% |  |
COLOMBIA |  |  |  |  |  |
Disclosure of income tax [line items] |  |  |  |  |  |
Applicable tax rate (as a percent) |  |  |  | 35.00% | 35.00% | 35.00%
Tax value unit (UVT) |  |  |  | 120,000 | 120,000 | 120,000
Tax rate of special free zone |  |  |  | 20.00% | 20.00% | 20.00%
COLOMBIA | Forecast |  |  |  |  |  |
Disclosure of income tax [line items] |  |  |  |  |  |
Applicable tax rate (as a percent) | 35.00% | 35.00% | 35.00% |  |  |
Tax value unit (UVT) | 120,000 | 120,000 | 120,000 |  |  |
COLOMBIA | Surcharge |  |  |  |  |  |
Disclosure of income tax [line items] |  |  |  |  |  |
Applicable tax rate (as a percent) |  |  |  | 5.00% | 5.00% | 3.00%
COLOMBIA | Surcharge | Forecast |  |  |  |  |  |
Disclosure of income tax [line items] |  |  |  |  |  |
Applicable tax rate (as a percent) | 5.00% | 5.00% | 5.00% |  |  |
COLOMBIA | Capital gain Tax |  |  |  |  |  |
Disclosure of income tax [line items] |  |  |  |  |  |
Applicable tax rate (as a percent) |  |  |  | 15.00% | 15.00% |
PANAMA |  |  |  |  |  |
Disclosure of income tax [line items] |  |  |  |  |  |
Applicable tax rate (as a percent) |  |  |  | 25.00% | 25.00% | 25.00%
PERU |  |  |  |  |  |
Disclosure of income tax [line items] |  |  |  |  |  |
Applicable tax rate (as a percent) |  |  |  | 29.50% | 29.50% | 29.50%
BARBADOS |  |  |  |  |  |
Disclosure of income tax [line items] |  |  |  |  |  |
Applicable tax rate (as a percent) |  |  |  | 4.25% | 4.25% | 4.25%

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