INCOME TAX - Deferred tax assets and liabilities - Gross deferred tax and offset (Details) - COP ($) $ in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
|---|---|---|---|---|
| Deferred tax assets and liabilities [abstract] | ||||
| Deferred tax (liability) asset | $ (4,592,028) | $ (3,988,263) | $ (4,265,728) | $ (3,211,452) |
| Deferred tax assets [member] | ||||
| Deferred tax assets and liabilities [abstract] | ||||
| Deferred tax (liability) asset | 7,566,046 | 7,527,728 | 6,642,821 | 7,669,219 |
| Deferred tax liability (asset), net, offset | (6,199,226) | (5,899,527) | ||
| Deferred tax liabilities [member] | ||||
| Deferred tax assets and liabilities [abstract] | ||||
| Deferred tax (liability) asset | (12,158,074) | (11,515,991) | $ (10,908,549) | $ (10,880,671) |
| Deferred tax liability (asset), net, offset | $ 6,199,226 | $ 5,899,527 |