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ESTIMATION OF FAIR VALUE - Valuation of equity instruments level 3 (Details) - Investments in equity instruments designated at fair value through other comprehensive income [member] $ in Millions | 12 Months Ended
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Dec. 31, 2024 COP ($) item | Dec. 31, 2023 COP ($) item
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Sensitivity analysis of investments | $ 61,197 | $ 81,925
Equity investments [member] | Level 3 of fair value hierarchy [member] | Favorable scenario |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Sensitivity analysis of investments | 1,128 | 3,196
Equity investments [member] | Level 3 of fair value hierarchy [member] | Unfavorable scenario |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Sensitivity analysis of investments | $ (1,046) | $ (3,093)
Equity investments [member] | Level 3 of fair value hierarchy [member] | Market comparable prices [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Increase in variation by number of times | item | 1 | 1
Decrease in variation by number of times | item | 1 | 1
Equity investments [member] | Level 3 of fair value hierarchy [member] | Market comparable prices [member] | Favorable scenario |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Sensitivity analysis of investments | $ 434 | $ 557
Equity investments [member] | Level 3 of fair value hierarchy [member] | Market comparable prices [member] | Unfavorable scenario |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Sensitivity analysis of investments | $ (434) | $ (556)
Equity investments [member] | Level 3 of fair value hierarchy [member] | Growth in residual values after five years |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Increase in variation (as a percent) |  | 1.00%
Decrease in variation (as a percent) |  | 1.00%
Equity investments [member] | Level 3 of fair value hierarchy [member] | Growth in residual values after five years | Favorable scenario |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Sensitivity analysis of investments |  | $ 281
Equity investments [member] | Level 3 of fair value hierarchy [member] | Growth in residual values after five years | Unfavorable scenario |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Sensitivity analysis of investments |  | $ (240)
Equity investments [member] | Level 3 of fair value hierarchy [member] | Income approach [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Increase in variation (as a percent) | 1.00% | 1.00%
Decrease in variation (as a percent) | 1.00% | 1.00%
Equity investments [member] | Level 3 of fair value hierarchy [member] | Income approach [member] | Favorable scenario |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Sensitivity analysis of investments | $ 320 | $ 1,035
Equity investments [member] | Level 3 of fair value hierarchy [member] | Income approach [member] | Unfavorable scenario |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Sensitivity analysis of investments | $ (282) | $ (1,046)
Equity investments [member] | Level 3 of fair value hierarchy [member] | Adjusted discounted cash flow, discount interest rates, one |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Increase in variation (as a percent) | 0.50% | 0.50%
Decrease in variation (as a percent) | 0.50% | 0.50%
Equity investments [member] | Level 3 of fair value hierarchy [member] | Adjusted discounted cash flow, discount interest rates, one | Favorable scenario |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Sensitivity analysis of investments | $ 222 | $ 1,066
Equity investments [member] | Level 3 of fair value hierarchy [member] | Adjusted discounted cash flow, discount interest rates, one | Unfavorable scenario |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Sensitivity analysis of investments | $ (216) | $ (988)
Equity investments [member] | Level 3 of fair value hierarchy [member] | Adjusted discounted cash flow, discount interest rates, two |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Increase in variation (as a percent) | 0.50% |
Decrease in variation (as a percent) | 0.50% |
Equity investments [member] | Level 3 of fair value hierarchy [member] | Adjusted discounted cash flow, discount interest rates, two | Favorable scenario |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Sensitivity analysis of investments | $ 114 |
Equity investments [member] | Level 3 of fair value hierarchy [member] | Adjusted discounted cash flow, discount interest rates, two | Unfavorable scenario |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Sensitivity analysis of investments | $ (114) |
Equity investments [member] | Level 3 of fair value hierarchy [member] | Gradient |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Increase in variation (as a percent) | 0.50% | 0.30%
Decrease in variation (as a percent) | 0.50% | 0.30%
Equity investments [member] | Level 3 of fair value hierarchy [member] | Gradient | Favorable scenario |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Sensitivity analysis of investments | $ 38 | $ 257
Equity investments [member] | Level 3 of fair value hierarchy [member] | Gradient | Unfavorable scenario |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Sensitivity analysis of investments |  | $ (263)

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