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RISK MANAGEMENT - Credit quality of financial assets (excluding loan portfolio) - Trading investments in debt securities (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
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
Debt securities [member] | Trading securities [member]    
Disclosure of financial assets [line items]    
Financial assets 7,113,380 3,760,887
Debt securities [member] | 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 7,113,380 3,760,887
Debt securities [member] | Trading securities [member] | Financial assets at fair value through profit or loss, classified as held for trading, category, International Financial Reporting Standards 9 [member] | Investment grade [member]    
Disclosure of financial assets [line items]    
Financial assets 6,136,270 2,912,653
Debt securities [member] | Trading securities [member] | Financial assets at fair value through profit or loss, classified as held for trading, category, International Financial Reporting Standards 9 [member] | Speculative grade [member]    
Disclosure of financial assets [line items]    
Financial assets 976,832 848,170
Debt securities [member] | Trading securities [member] | Financial assets at fair value through profit or loss, classified as held for trading, category, International Financial Reporting Standards 9 [member] | Without grade or not available [member]    
Disclosure of financial assets [line items]    
Financial assets 278 64
Sovereign | Trading securities [member] | Financial assets at fair value through profit or loss, classified as held for trading, category, International Financial Reporting Standards 9 [member] | Investment grade [member]    
Disclosure of financial assets [line items]    
Financial assets 5,764,699 2,721,755
Sovereign | Trading securities [member] | Financial assets at fair value through profit or loss, classified as held for trading, category, International Financial Reporting Standards 9 [member] | Speculative grade [member]    
Disclosure of financial assets [line items]    
Financial assets 62,213 157,246
Other Public Entities | Trading securities [member] | Financial assets at fair value through profit or loss, classified as held for trading, category, International Financial Reporting Standards 9 [member] | Investment grade [member]    
Disclosure of financial assets [line items]    
Financial assets 18,886 12,202
Other Public Entities | Trading securities [member] | Financial assets at fair value through profit or loss, classified as held for trading, category, International Financial Reporting Standards 9 [member] | Speculative grade [member]    
Disclosure of financial assets [line items]    
Financial assets 136,851 181,948
Corporate | Trading securities [member] | Financial assets at fair value through profit or loss, classified as held for trading, category, International Financial Reporting Standards 9 [member] | Investment grade [member]    
Disclosure of financial assets [line items]    
Financial assets 3,412 112
Corporate | Trading securities [member] | Financial assets at fair value through profit or loss, classified as held for trading, category, International Financial Reporting Standards 9 [member] | Speculative grade [member]    
Disclosure of financial assets [line items]    
Financial assets 42,581 33,880
Corporate | Trading securities [member] | Financial assets at fair value through profit or loss, classified as held for trading, category, International Financial Reporting Standards 9 [member] | Without grade or not available [member]    
Disclosure of financial assets [line items]    
Financial assets 278 64
Financial Entities | Trading securities [member] | Financial assets at fair value through profit or loss, classified as held for trading, category, International Financial Reporting Standards 9 [member] | Investment grade [member]    
Disclosure of financial assets [line items]    
Financial assets 349,273 178,584
Financial Entities | Trading securities [member] | Financial assets at fair value through profit or loss, classified as held for trading, category, International Financial Reporting Standards 9 [member] | Speculative grade [member]    
Disclosure of financial assets [line items]    
Financial assets $ 735,187 473,223
Multilaterals | Trading securities [member] | Financial assets at fair value through profit or loss, classified as held for trading, category, International Financial Reporting Standards 9 [member] | Speculative grade [member]    
Disclosure of financial assets [line items]    
Financial assets   $ 1,873