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RISK MANAGEMENT - Trading book risk - Assets (Details) - COP ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets $ 304,853,883 $ 280,746,878
Market risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 40,012,350 32,568,274
Financial assets at fair value through profit or loss, category [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 24,400,493 19,332,588
Financial assets measured at fair value through other comprehensive income, category [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 27,050,198 23,326,776
Trading securities [member]    
Disclosure of nature and extent of risks arising from financial instruments [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 nature and extent of risks arising from financial instruments [line items]    
Financial assets 20,163,214 15,451,121
Investment securities at fair value [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 28,472,926 24,446,014
Debt securities [member] | Market risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 38,989,037 30,442,045
Debt securities [member] | Trading securities [member]    
Disclosure of nature and extent of risks arising from financial instruments [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 nature and extent of risks arising from financial instruments [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] | Market risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 11,937,414 7,113,380
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 nature and extent of risks arising from financial instruments [line items]    
Financial assets 1,425 1,889
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] | Market risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 1,425 1,889
Debt securities [member] | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 27,050,198 23,326,776
Debt securities [member] | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Market risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 27,050,198 23,326,776
Derivatives [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 1,023,313 2,126,229
Derivatives [member] | Market risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 1,023,313 2,126,229
Derivatives [member] | Trading securities [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 969,294 2,077,567
Derivatives [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 nature and extent of risks arising from financial instruments [line items]    
Financial assets 969,294 2,077,567
Derivatives [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] | Market risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 969,294 2,077,567
Derivatives [member] | Hedging instruments [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 54,019 48,662
Derivatives [member] | Hedging instruments [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 54,019 48,662
Derivatives [member] | Hedging instruments [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Market risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets $ 54,019 $ 48,662