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INCOME TAX - Components of income tax expense (Details) - COP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of income tax [abstract]      
Current period income tax $ 1,017,411 $ 822,758 $ 1,075,407
Income tax surcharge 27,627 15,625 60,730
Subtotal current period taxes 1,045,038 838,383 1,136,137
Prior years adjustments (20,491) (35,553) (102,937)
Adjustment due to settlement of uncertain tax positions form prior years (772) (6,802) (933)
Deferred taxes current period 286,824 1,467,519 1,256,588
Deferred taxes - Prior years adjustments (165) 7,857 34,573
Subtotal deferred taxes 286,659 1,475,376 1,291,161
Total tax expense $ 1,310,434 $ 2,271,404 $ 2,323,428