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INCOME TAX - Reconciliation between total expenses of income tax and tax expense - General information (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2027
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Dec. 31, 2026
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Dec. 31, 2025
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Dec. 31, 2024
COP ($)
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Dec. 31, 2023
COP ($)
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Dec. 31, 2022
COP ($)
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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%