v3.26.1
RISK MANAGEMENT - Liquidity risk - Undiscounted cash flows of financial liabilities (Details) - COP ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities $ 278,063,105 $ 274,729,544
Liquidity risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 292,816,987 286,706,897
Liquidity risk [member] | Not later than one month [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 148,713,033 133,982,932
Liquidity risk [member] | Later than one month and not later than six months [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 57,328,977 61,787,411
Liquidity risk [member] | Later than six months and not later than one year [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 32,822,890 31,519,583
Liquidity risk [member] | Later than one year [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 53,952,087 59,416,971
Financial liabilities at fair value through profit or loss, category [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 1,986,281 1,033,592
Financial liabilities at amortised cost, category [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 276,076,824 273,695,952
Trading derivatives [member] | Financial liabilities at fair value through profit or loss, classified as held for trading, category [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 1,951,439 1,011,934
Customer deposits [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 207,405,238 200,872,177
Customer deposits [member] | Financial liabilities at amortised cost, category [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 207,405,238 200,872,177
Checking accounts [member] | Financial liabilities at amortised cost, category [member] | Liquidity risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 23,598,235 24,579,536
Checking accounts [member] | Financial liabilities at amortised cost, category [member] | Liquidity risk [member] | Not later than one month [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 23,598,235 24,579,536
Time deposits [member] | Financial liabilities at amortised cost, category [member] | Liquidity risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 101,697,409 102,545,667
Time deposits [member] | Financial liabilities at amortised cost, category [member] | Liquidity risk [member] | Not later than one month [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 12,207,927 9,186,183
Time deposits [member] | Financial liabilities at amortised cost, category [member] | Liquidity risk [member] | Later than one month and not later than six months [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 44,796,477 49,090,487
Time deposits [member] | Financial liabilities at amortised cost, category [member] | Liquidity risk [member] | Later than six months and not later than one year [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 23,537,597 25,405,518
Time deposits [member] | Financial liabilities at amortised cost, category [member] | Liquidity risk [member] | Later than one year [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 21,155,408 18,863,479
Saving deposits [member] | Financial liabilities at amortised cost, category [member] | Liquidity risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 88,238,541 79,614,904
Saving deposits [member] | Financial liabilities at amortised cost, category [member] | Liquidity risk [member] | Not later than one month [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 88,238,541 79,614,904
Other deposits [member] | Financial liabilities at amortised cost, category [member] | Liquidity risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 462,545 347,910
Other deposits [member] | Financial liabilities at amortised cost, category [member] | Liquidity risk [member] | Not later than one month [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 432,549 235,111
Other deposits [member] | Financial liabilities at amortised cost, category [member] | Liquidity risk [member] | Later than one month and not later than six months [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 29,996 111,456
Other deposits [member] | Financial liabilities at amortised cost, category [member] | Liquidity risk [member] | Later than one year [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities   1,343
Financial obligations [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 68,671,586 72,823,775
Financial obligations [member] | Financial liabilities at amortised cost, category [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 68,671,586 72,823,775
Interbank and overnight funds [member] | Financial liabilities at amortised cost, category [member] | Liquidity risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 22,667,854 18,536,807
Interbank and overnight funds [member] | Financial liabilities at amortised cost, category [member] | Liquidity risk [member] | Not later than one month [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 22,456,432 17,666,654
Interbank and overnight funds [member] | Financial liabilities at amortised cost, category [member] | Liquidity risk [member] | Later than one month and not later than six months [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 208,589 538,143
Interbank and overnight funds [member] | Financial liabilities at amortised cost, category [member] | Liquidity risk [member] | Later than six months and not later than one year [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 2,833 332,010
Borrowing from banks and other [member] | Financial liabilities at amortised cost, category [member] | Liquidity risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 28,957,844 30,661,500
Borrowing from banks and other [member] | Financial liabilities at amortised cost, category [member] | Liquidity risk [member] | Not later than one month [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 1,197,304 1,995,053
Borrowing from banks and other [member] | Financial liabilities at amortised cost, category [member] | Liquidity risk [member] | Later than one month and not later than six months [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 6,658,939 10,510,170
Borrowing from banks and other [member] | Financial liabilities at amortised cost, category [member] | Liquidity risk [member] | Later than six months and not later than one year [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 7,630,961 4,796,438
Borrowing from banks and other [member] | Financial liabilities at amortised cost, category [member] | Liquidity risk [member] | Later than one year [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 13,470,640 13,359,839
IFRS Long-term Debt [Member] | Financial liabilities at amortised cost, category [member] | Liquidity risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 24,427,462 29,386,367
IFRS Long-term Debt [Member] | Financial liabilities at amortised cost, category [member] | Liquidity risk [member] | Not later than one month [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities   395,469
IFRS Long-term Debt [Member] | Financial liabilities at amortised cost, category [member] | Liquidity risk [member] | Later than one month and not later than six months [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 4,692,748 1,156,876
IFRS Long-term Debt [Member] | Financial liabilities at amortised cost, category [member] | Liquidity risk [member] | Later than six months and not later than one year [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 1,191,133 886,593
IFRS Long-term Debt [Member] | Financial liabilities at amortised cost, category [member] | Liquidity risk [member] | Later than one year [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 18,543,581 26,947,429
Derivatives [member] | Trading derivatives [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 1,951,439 1,011,934
Derivatives [member] | Trading derivatives [member] | Financial liabilities at fair value through profit or loss, classified as held for trading, category [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 1,951,439 1,011,934
Derivatives [member] | Trading derivatives [member] | Financial liabilities at fair value through profit or loss, classified as held for trading, category [member] | Liquidity risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 2,632,382 1,025,429
Derivatives [member] | Trading derivatives [member] | Financial liabilities at fair value through profit or loss, classified as held for trading, category [member] | Liquidity risk [member] | Not later than one month [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 582,011 308,653
Derivatives [member] | Trading derivatives [member] | Financial liabilities at fair value through profit or loss, classified as held for trading, category [member] | Liquidity risk [member] | Later than one month and not later than six months [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 835,227 380,271
Derivatives [member] | Trading derivatives [member] | Financial liabilities at fair value through profit or loss, classified as held for trading, category [member] | Liquidity risk [member] | Later than six months and not later than one year [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 438,932 95,804
Derivatives [member] | Trading derivatives [member] | Financial liabilities at fair value through profit or loss, classified as held for trading, category [member] | Liquidity risk [member] | Later than one year [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 776,212 240,701
Derivatives [member] | Hedging instruments [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 34,842 21,658
Derivatives [member] | Hedging instruments [member] | Financial liabilities 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 liabilities 34,842 21,658
Derivatives [member] | Hedging instruments [member] | Financial liabilities at fair value through profit or loss, mandatorily measured at fair value, category [member] | Liquidity risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 134,715 8,777
Derivatives [member] | Hedging instruments [member] | Financial liabilities at fair value through profit or loss, mandatorily measured at fair value, category [member] | Liquidity risk [member] | Not later than one month [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 34 1,369
Derivatives [member] | Hedging instruments [member] | Financial liabilities at fair value through profit or loss, mandatorily measured at fair value, category [member] | Liquidity risk [member] | Later than one month and not later than six months [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 107,001 8
Derivatives [member] | Hedging instruments [member] | Financial liabilities at fair value through profit or loss, mandatorily measured at fair value, category [member] | Liquidity risk [member] | Later than six months and not later than one year [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 21,434 3,220
Derivatives [member] | Hedging instruments [member] | Financial liabilities at fair value through profit or loss, mandatorily measured at fair value, category [member] | Liquidity risk [member] | Later than one year [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities $ 6,246 $ 4,180