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INCOME TAX - Tax losses and excess of presumptive income (Details) - COP ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of income tax [line items]    
Tax loss carry forwards not recognized as deferred tax assets $ 1,993,196 $ 1,629,254
Excess of presumptive income not recognized as deferred tax assets 34,525 75,529
Tax loss carry forwards and excess of presumptive income not recognized as deferred tax assets 2,027,721 1,704,783
Not later than one year [member]    
Disclosure of income tax [line items]    
Tax loss carry forwards not recognized as deferred tax assets 4,902 1,323
Excess of presumptive income not recognized as deferred tax assets 26,883 44,246
Later than one year and not later than two years [member]    
Disclosure of income tax [line items]    
Tax loss carry forwards not recognized as deferred tax assets 2,179 4,846
Excess of presumptive income not recognized as deferred tax assets 7,642 24,492
Later than two years and not later than three years [member]    
Disclosure of income tax [line items]    
Tax loss carry forwards not recognized as deferred tax assets 5,908 2,748
Excess of presumptive income not recognized as deferred tax assets   6,791
Later than three years and not later than four years [member]    
Disclosure of income tax [line items]    
Tax loss carry forwards not recognized as deferred tax assets   40
Later than five years and not later than six years [member]    
Disclosure of income tax [line items]    
Tax loss carry forwards not recognized as deferred tax assets 173,448  
Later than six years and not later than seven years [member]    
Disclosure of income tax [line items]    
Tax loss carry forwards not recognized as deferred tax assets 289,982 170,835
Later than seven years and not later than eight years [member]    
Disclosure of income tax [line items]    
Tax loss carry forwards not recognized as deferred tax assets 248,444 279,605
Later than eight years and not later than nine years [member]    
Disclosure of income tax [line items]    
Tax loss carry forwards not recognized as deferred tax assets 169,572 215,970
Later than nine years and not later than ten years [member]    
Disclosure of income tax [line items]    
Tax loss carry forwards not recognized as deferred tax assets 37,969 15,799
Later than ten years and not later than eleven years [member]    
Disclosure of income tax [line items]    
Tax loss carry forwards not recognized as deferred tax assets 262,578 6,931
Later than eleven years and not later than twelve years [member]    
Disclosure of income tax [line items]    
Tax loss carry forwards not recognized as deferred tax assets 383,897 516,801
Later than twelve years and not later than thirteen years [member]    
Disclosure of income tax [line items]    
Tax loss carry forwards not recognized as deferred tax assets   122
Without expiration date [member]    
Disclosure of income tax [line items]    
Tax loss carry forwards not recognized as deferred tax assets $ 414,318 $ 414,234