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RISK MANAGEMENT - Trading book risk - Net position (Details) - COP ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets $ 343,332,362 $ 303,076,129
Financial liabilities 308,858,471 271,975,564
Market risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 43,442,310 35,044,878
Financial liabilities 1,105,723 1,509,201
Net position $ 42,336,587 $ 33,535,677