v3.26.1
RISK MANAGEMENT - Trading book risk - Assets (Details) - COP ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets $ 305,457,293 $ 304,853,883
Market risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 48,492,380 40,012,350
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 31,969,586 24,400,493
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 28,455,957 27,050,198
Trading securities [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 29,097,591 20,163,214
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 29,097,591 20,163,214
Investment securities at fair value [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 30,055,436 28,472,926
Debt securities [member] | Market risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 46,038,801 38,989,037
Debt securities [member] | Trading securities [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 17,582,844 11,937,414
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 17,582,844 11,937,414
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 17,582,844 11,937,414
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
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
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 28,455,957 27,050,198
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 28,455,957 27,050,198
Derivatives [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 2,453,579 1,023,313
Derivatives [member] | Market risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 2,453,579 1,023,313
Derivatives [member] | Trading securities [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 2,217,021 969,294
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 2,217,021 969,294
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 2,217,021 969,294
Derivatives [member] | Hedging instruments [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 236,558 54,019
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 236,558 54,019
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 $ 236,558 $ 54,019