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INCOME TAX - Deferred tax assets and liabilities - Gross deferred tax and offset (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 liability (asset), net, offset	(5,361,909)	(5,818,001)
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 liability (asset), net, offset	$ 5,361,909	$ 5,818,001