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RISK MANAGEMENT - Trading book risk - Net position (Details) - COP ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets $ 259,515,428 $ 245,105,338
Financial liabilities 231,392,733 216,578,285
Market risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 27,376,239 23,528,815
Financial liabilities 1,056,736 1,006,844
Net position $ 26,319,503 $ 22,521,971