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ESTIMATION OF FAIR VALUE - Measurements at fair value on a non-recurring basis (Details) - COP ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of fair value measurement of assets [line items]    
Non-current assets held for sale $ 101,184 $ 92,830
Non-recurring fair value measurement    
Disclosure of fair value measurement of assets [line items]    
Impaired collateralized loans 1,494,862 1,740,705
Non-current assets held for sale 101,184 92,830
Assets held for sale 1,596,046 1,833,535
Level 3 of fair value hierarchy [member] | Non-recurring fair value measurement    
Disclosure of fair value measurement of assets [line items]    
Impaired collateralized loans 1,494,862 1,740,705
Non-current assets held for sale 101,184 92,830
Assets held for sale $ 1,596,046 $ 1,833,535