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INVESTMENT SECURITIES - Investments in debt securities mandatorily at FVTPL (Details) - COP ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of financial assets [line items]    
Financial assets $ 280,746,878 $ 274,682,875
Financial assets at fair value through profit or loss, category [member]    
Disclosure of financial assets [line items]    
Financial assets 19,332,588 15,370,870
Investment securities at fair value [member]    
Disclosure of financial assets [line items]    
Financial assets 24,446,014 23,939,915
Debt securities [member] | Investment securities at fair value [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member]    
Disclosure of financial assets [line items]    
Financial assets 1,889 1,378
Other debt securities | Investment securities at fair value [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member]    
Disclosure of financial assets [line items]    
Financial assets $ 1,889 $ 1,378