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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets and liabilities [abstract]        
Deferred tax (liability) asset, net $ (4,265,728) $ (3,211,452) $ (2,567,101) $ (2,320,272)
Deferred tax assets [member]        
Deferred tax assets and liabilities [abstract]        
Deferred tax (liability) asset, net 6,642,821 7,669,219 6,171,791 4,166,160
Deferred tax assets [member] | Later than one year [member]        
Deferred tax assets and liabilities [abstract]        
Deferred tax (liability) asset, net 4,922,586 5,656,771    
Deferred tax assets [member] | Not later than one year [member]        
Deferred tax assets and liabilities [abstract]        
Deferred tax (liability) asset, net 1,720,235 2,012,448    
Deferred tax liabilities [member]        
Deferred tax assets and liabilities [abstract]        
Deferred tax (liability) asset, net (10,908,549) (10,880,671) $ (8,738,892) $ (6,486,432)
Deferred tax liabilities [member] | Later than one year [member]        
Deferred tax assets and liabilities [abstract]        
Deferred tax (liability) asset, net (9,909,062) (9,560,077)    
Deferred tax liabilities [member] | Not later than one year [member]        
Deferred tax assets and liabilities [abstract]        
Deferred tax (liability) asset, net $ (999,487) $ (1,320,594)