v3.26.1
ASSETS AND FINANCIAL LIABILITIES - Financial assets (Details) - COP ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of financial assets [line items]        
Financial assets $ 305,457,293 $ 304,853,883    
Financial assets at fair value through profit or loss, category [member]        
Disclosure of financial assets [line items]        
Financial assets 31,969,586 24,400,493    
Financial assets at amortised cost, category [member]        
Disclosure of financial assets [line items]        
Financial assets 243,432,271 251,981,889    
Financial assets measured at fair value through other comprehensive income, category [member]        
Disclosure of financial assets [line items]        
Financial assets 28,455,957 27,050,198    
Investments in equity instruments designated at fair value through other comprehensive income [member]        
Disclosure of financial assets [line items]        
Financial assets 1,599,479 1,421,303    
Investment securities [member]        
Disclosure of financial assets [line items]        
Financial assets 39,252,615 39,162,618    
Investment securities [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 39,260,893 39,181,293    
Investment securities [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 9,205,457 10,708,367    
Other accounts receivable at fair value through profit or loss, mandatorily measured at fair value, and at amortized cost [member]        
Disclosure of financial assets [line items]        
Financial assets 24,458,906 27,958,402    
Other accounts receivable at fair value through profit or loss, mandatorily measured at fair value, and at amortized cost [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 24,851,598 28,320,373    
Other accounts receivable at fair value through profit or loss, mandatorily measured at fair value, and at amortized cost [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 2,635,437 4,181,835    
Other accounts receivable at fair value through profit or loss, mandatorily measured at fair value, and at amortized cost [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 22,216,161 24,138,538    
Loan portfolio [member] | Financial assets at amortised cost, category [member]        
Disclosure of financial assets [line items]        
Financial assets 184,225,973 190,129,486    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 192,655,943 200,136,125 $ 186,203,770 $ 188,313,361
Other accounts receivable at amortized cost [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 22,216,161 24,138,538    
Other accounts receivable at amortized cost [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 22,216,161 24,138,538    
Trading securities [member]        
Disclosure of financial assets [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 financial assets [line items]        
Financial assets 29,097,591 20,163,214    
Investment securities at fair value [member]        
Disclosure of financial assets [line items]        
Financial assets 30,055,436 28,472,926    
Service concession arrangement [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 2,635,437 4,181,835    
Service concession arrangement [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 2,635,437 4,181,835    
IFRS Cash and Cash Equivalents [Member]        
Disclosure of financial assets [line items]        
Financial assets 19,354,710 16,998,859    
IFRS Cash and Cash Equivalents [Member] | Financial assets at amortised cost, category [member]        
Disclosure of financial assets [line items]        
Financial assets 19,354,710 16,998,859    
Debt securities [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 55,244,258 49,697,404    
Debt securities [member] | Investment securities [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 39,260,893 39,181,293    
Debt securities [member] | Investment securities [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member]        
Disclosure of financial assets [line items]        
Financial assets   1,425    
Debt securities [member] | Investment securities [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 9,205,457 10,708,367    
Debt securities [member] | Investment securities [member] | Financial assets measured at fair value through other comprehensive income, category [member]        
Disclosure of financial assets [line items]        
Financial assets 28,455,957 27,050,198    
Debt securities [member] | Trading securities [member]        
Disclosure of financial assets [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 financial assets [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] | Gross carrying amount [member]        
Disclosure of financial assets [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 financial assets [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 financial assets [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] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 28,455,957 27,050,198    
Trading equity securities [member] | Trading securities [member]        
Disclosure of financial assets [line items]        
Financial assets 9,297,726 7,256,506    
Trading equity 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 9,297,726 7,256,506    
Equity investments [member] | Investment securities [member] | Investments in equity instruments designated at fair value through other comprehensive income [member]        
Disclosure of financial assets [line items]        
Financial assets 1,599,479 1,421,303    
Equity investments [member] | Investment securities at fair value [member] | Investments in equity instruments designated at fair value through other comprehensive income [member]        
Disclosure of financial assets [line items]        
Financial assets 1,599,479 1,421,303    
Derivatives [member]        
Disclosure of financial assets [line items]        
Financial assets 2,453,579 1,023,313    
Derivatives [member] | Trading securities [member]        
Disclosure of financial assets [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 financial assets [line items]        
Financial assets 2,217,021 969,294    
Derivatives [member] | Hedging instruments [member]        
Disclosure of financial assets [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 financial assets [line items]        
Financial assets $ 236,558 $ 54,019