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TRADING ASSETS AND LIABILITIES - Investments in equity securities at fair value (Details) - COP ($)
$ in Millions
12 Months Ended
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
Trading securities [member]    
Disclosure of financial assets [line items]    
Financial assets 15,451,121 11,841,407
Trading securities [member] | Financial assets at fair value through profit or loss, classified as held for trading, category, International Financial Reporting Standards 9 [member]    
Disclosure of financial assets [line items]    
Financial assets 15,451,121 11,841,407
Private real estate equity fund Nexus    
Disclosure of financial assets [line items]    
Financial assets at fair value through profit or loss classified as held equity securities $ 2,567,099 1,602,297
Pension and severance funds    
Disclosure of financial assets [line items]    
Percentage of total assets of funds to be invested in mandatory severance and pension funds 1.00%  
Equity financial instruments | Trading securities [member]    
Disclosure of financial assets [line items]    
Financial assets $ 6,260,174 6,039,115
Equity financial instruments | Trading securities [member] | Financial assets at fair value through profit or loss, classified as held for trading, category, International Financial Reporting Standards 9 [member]    
Disclosure of financial assets [line items]    
Financial assets 6,260,174 6,039,115
Equity financial instruments | Trading securities [member] | Financial assets at fair value through profit or loss, classified as held for trading, category, International Financial Reporting Standards 9 [member] | Colombia, Pesos    
Disclosure of financial assets [line items]    
Financial assets 6,172,974 5,932,409
Equity financial instruments | Trading securities [member] | Financial assets at fair value through profit or loss, classified as held for trading, category, International Financial Reporting Standards 9 [member] | Foreign currency [member]    
Disclosure of financial assets [line items]    
Financial assets 87,200 106,706
Equity financial instruments | Corporate stock | Financial assets at fair value through profit or loss, classified as held for trading, category, International Financial Reporting Standards 9 [member] | Colombia, Pesos    
Disclosure of financial assets [line items]    
Financial assets 8,949 4,040
Equity financial instruments | Corporate stock | Financial assets at fair value through profit or loss, classified as held for trading, category, International Financial Reporting Standards 9 [member] | Foreign currency [member]    
Disclosure of financial assets [line items]    
Financial assets 4,100 5,490
Equity financial instruments | Investment funds | Financial assets at fair value through profit or loss, classified as held for trading, category, International Financial Reporting Standards 9 [member] | Colombia, Pesos    
Disclosure of financial assets [line items]    
Financial assets 4,079,070 3,855,604
Equity financial instruments | Investment funds | Financial assets at fair value through profit or loss, classified as held for trading, category, International Financial Reporting Standards 9 [member] | Foreign currency [member]    
Disclosure of financial assets [line items]    
Financial assets 83,100 101,216
Equity financial instruments | Pension and severance funds | Financial assets at fair value through profit or loss, classified as held for trading, category, International Financial Reporting Standards 9 [member] | Colombia, Pesos    
Disclosure of financial assets [line items]    
Financial assets $ 2,084,955 $ 2,072,765