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ESTIMATION OF FAIR VALUE - Measurements at fair value on a non-recurring basis (Details) - COP ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of fair value measurement of assets [line items]    
Non-current assets held for sale $ 105,214 $ 101,184
Non-recurring fair value measurement [member]    
Disclosure of fair value measurement of assets [line items]    
Impaired collateralized loans 1,795,616 1,494,862
Non-current assets held for sale 105,214 101,184
Assets held for sale 1,900,830 1,596,046
Level 3 of fair value hierarchy [member] | Non-recurring fair value measurement [member]    
Disclosure of fair value measurement of assets [line items]    
Impaired collateralized loans 1,795,616 1,494,862
Non-current assets held for sale 105,214 101,184
Assets held for sale $ 1,900,830 $ 1,596,046