INVESTMENT SECURITIES - Investments in equity securities at fair value through OCI (Details) - Investments in equity instruments designated at fair value through other comprehensive income [member] - Equity investments [member] - Investment securities at fair value [member] - COP ($) $ in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Disclosure of financial assets [line items] | ||
| Cost | $ 515,160 | $ 597,035 |
| Unrealized Gain | 1,092,859 | 836,645 |
| Unrealized Losses | (8,540) | (12,377) |
| Fair Value | 1,599,479 | 1,421,303 |
| Colombia, Pesos | ||
| Disclosure of financial assets [line items] | ||
| Cost | 462,233 | 546,822 |
| Unrealized Gain | 1,091,504 | 832,222 |
| Unrealized Losses | (4,769) | (2,799) |
| Fair Value | 1,548,968 | 1,376,245 |
| Foreign currency [member] | ||
| Disclosure of financial assets [line items] | ||
| Cost | 52,927 | 50,213 |
| Unrealized Gain | 1,355 | 4,423 |
| Unrealized Losses | (3,771) | (9,578) |
| Fair Value | $ 50,511 | $ 45,058 |