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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, 2024
Dec. 31, 2023
Disclosure of financial assets [line items]    
Financial assets $ 304,853,883 $ 280,746,878
Financial assets at fair value through profit or loss, category [member]    
Disclosure of financial assets [line items]    
Financial assets 24,400,493 19,332,588
Trading securities [member]    
Disclosure of financial assets [line items]    
Financial assets 20,163,214 15,451,121
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 20,163,214 15,451,121
Debt securities [member] | Trading securities [member]    
Disclosure of financial assets [line items]    
Financial assets 11,937,414 7,113,380
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 11,937,414 7,113,380
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 10,877,024 6,136,270
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 1,060,390 976,832
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
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 10,699,113 5,764,699
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 17,824 62,213
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 12,450 18,886
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 171,310 136,851
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 3,996 3,412
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 30,527 42,581
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
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 161,465 349,273
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 $ 840,729 $ 735,187