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INCOME TAX - Estimates to recover income tax assets and settle income tax liabilities - Deferred tax (Details) - COP ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Deferred tax assets and liabilities [abstract]        
Deferred tax (liability) asset, net $ (3,988,263) $ (4,265,728) $ (3,211,452) $ (2,567,101)
Deferred tax assets [member]        
Deferred tax assets and liabilities [abstract]        
Deferred tax (liability) asset, net 7,527,728 6,642,821 7,669,219 6,171,791
Deferred tax assets [member] | Later than one year [member]        
Deferred tax assets and liabilities [abstract]        
Deferred tax (liability) asset, net 1,238,172 1,720,235    
Deferred tax assets [member] | Not later than one year [member]        
Deferred tax assets and liabilities [abstract]        
Deferred tax (liability) asset, net 6,289,556 4,922,586    
Deferred tax liabilities [member]        
Deferred tax assets and liabilities [abstract]        
Deferred tax (liability) asset, net (11,515,991) (10,908,549) $ (10,880,671) $ (8,738,892)
Deferred tax liabilities [member] | Later than one year [member]        
Deferred tax assets and liabilities [abstract]        
Deferred tax (liability) asset, net (1,082,965) (999,487)    
Deferred tax liabilities [member] | Not later than one year [member]        
Deferred tax assets and liabilities [abstract]        
Deferred tax (liability) asset, net $ (10,433,026) $ (9,909,062)