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INVESTMENT SECURITIES - Balances of investment securities (Details)
$ in Millions, $ in Millions
Dec. 31, 2018
USD ($)
[1]
Dec. 31, 2018
COP ($)
Dec. 31, 2017
COP ($)
Disclosure of investment securities      
Total investment securities   $ 23,030,230  
Loss impairment   (71)  
Total investment securities net $ 7,086.7 23,030,159 $ 21,513,199 [2]
Investments in debt securities available for sale     17,790,127
Investments in debt securities held to maturity     2,899,039
Investments in equity securities available-for-sale     $ 824,033
Financial assets at fair value through profit or loss, category [member]      
Disclosure of investment securities      
Total investment securities   31,256  
Financial assets measured at fair value through other comprehensive income, category [member]      
Disclosure of investment securities      
Total investment securities   18,935,757  
Financial assets at amortised cost, category [member]      
Disclosure of investment securities      
Total investment securities   2,972,616  
Loss impairment   (71)  
Investments in equity instruments designated at fair value through other comprehensive income [member]      
Disclosure of investment securities      
Total investment securities   $ 1,090,601  
[1] See note 2.4, “convenience translation into U.S. dollars”.
[2] See note 2.32, Changes in presentation.