v3.26.1
ESTIMATION OF FAIR VALUE - Measurements of fair value of liabilities on a recurring basis (Details) - COP ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure of fair value measurement of liabilities [line items]    
Liabilities $ 314,193,836 $ 294,696,465
Recurring fair value measurement [member]    
Disclosure of fair value measurement of liabilities [line items]    
Liabilities 1,986,281 1,033,592
Recurring fair value measurement [member] | Trading derivatives [member] | Derivatives [member] | Financial liabilities at fair value through profit or loss, classified as held for trading, category [member]    
Disclosure of fair value measurement of liabilities [line items]    
Liabilities 1,951,439 1,011,934
Recurring fair value measurement [member] | Trading derivatives [member] | Currency forward [member] | Financial liabilities at fair value through profit or loss, classified as held for trading, category [member]    
Disclosure of fair value measurement of liabilities [line items]    
Liabilities 991,647 672,690
Recurring fair value measurement [member] | Trading derivatives [member] | Bond forward [member] | Financial liabilities at fair value through profit or loss, classified as held for trading, category [member]    
Disclosure of fair value measurement of liabilities [line items]    
Liabilities 38,858 15,978
Recurring fair value measurement [member] | Trading derivatives [member] | Interest rate swap contract [member] | Financial liabilities at fair value through profit or loss, classified as held for trading, category [member]    
Disclosure of fair value measurement of liabilities [line items]    
Liabilities 832,470 221,822
Recurring fair value measurement [member] | Trading derivatives [member] | Currency swap contract [member] | Financial liabilities at fair value through profit or loss, classified as held for trading, category [member]    
Disclosure of fair value measurement of liabilities [line items]    
Liabilities 36,441 52,455
Recurring fair value measurement [member] | Trading derivatives [member] | Currency Options [member] | Financial liabilities at fair value through profit or loss, classified as held for trading, category [member]    
Disclosure of fair value measurement of liabilities [line items]    
Liabilities 52,023 48,989
Recurring fair value measurement [member] | Hedging instruments [member] | Derivatives [member] | Financial liabilities at fair value through profit or loss, mandatorily measured at fair value, category [member]    
Disclosure of fair value measurement of liabilities [line items]    
Liabilities 34,842 21,658
Recurring fair value measurement [member] | Hedging instruments [member] | Currency forward [member] | Financial liabilities at fair value through profit or loss, mandatorily measured at fair value, category [member]    
Disclosure of fair value measurement of liabilities [line items]    
Liabilities 9,741 5,250
Recurring fair value measurement [member] | Hedging instruments [member] | Interest rate swap contract [member] | Financial liabilities at fair value through profit or loss, mandatorily measured at fair value, category [member]    
Disclosure of fair value measurement of liabilities [line items]    
Liabilities 25,101 16,408
Recurring fair value measurement [member] | Level 1 of fair value hierarchy [member]    
Disclosure of fair value measurement of liabilities [line items]    
Liabilities 35,179 2,469
Recurring fair value measurement [member] | Level 1 of fair value hierarchy [member] | Trading derivatives [member] | Derivatives [member] | Financial liabilities at fair value through profit or loss, classified as held for trading, category [member]    
Disclosure of fair value measurement of liabilities [line items]    
Liabilities 35,179 2,469
Recurring fair value measurement [member] | Level 1 of fair value hierarchy [member] | Trading derivatives [member] | Interest rate swap contract [member] | Financial liabilities at fair value through profit or loss, classified as held for trading, category [member]    
Disclosure of fair value measurement of liabilities [line items]    
Liabilities 35,179 2,469
Recurring fair value measurement [member] | Level 2 of fair value hierarchy [member]    
Disclosure of fair value measurement of liabilities [line items]    
Liabilities 1,951,102 1,031,123
Recurring fair value measurement [member] | Level 2 of fair value hierarchy [member] | Trading derivatives [member] | Derivatives [member] | Financial liabilities at fair value through profit or loss, classified as held for trading, category [member]    
Disclosure of fair value measurement of liabilities [line items]    
Liabilities 1,916,260 1,009,465
Recurring fair value measurement [member] | Level 2 of fair value hierarchy [member] | Trading derivatives [member] | Currency forward [member] | Financial liabilities at fair value through profit or loss, classified as held for trading, category [member]    
Disclosure of fair value measurement of liabilities [line items]    
Liabilities 991,647 672,690
Recurring fair value measurement [member] | Level 2 of fair value hierarchy [member] | Trading derivatives [member] | Bond forward [member] | Financial liabilities at fair value through profit or loss, classified as held for trading, category [member]    
Disclosure of fair value measurement of liabilities [line items]    
Liabilities 38,858 15,978
Recurring fair value measurement [member] | Level 2 of fair value hierarchy [member] | Trading derivatives [member] | Interest rate swap contract [member] | Financial liabilities at fair value through profit or loss, classified as held for trading, category [member]    
Disclosure of fair value measurement of liabilities [line items]    
Liabilities 797,291 219,353
Recurring fair value measurement [member] | Level 2 of fair value hierarchy [member] | Trading derivatives [member] | Currency swap contract [member] | Financial liabilities at fair value through profit or loss, classified as held for trading, category [member]    
Disclosure of fair value measurement of liabilities [line items]    
Liabilities 36,441 52,455
Recurring fair value measurement [member] | Level 2 of fair value hierarchy [member] | Trading derivatives [member] | Currency Options [member] | Financial liabilities at fair value through profit or loss, classified as held for trading, category [member]    
Disclosure of fair value measurement of liabilities [line items]    
Liabilities 52,023 48,989
Recurring fair value measurement [member] | Level 2 of fair value hierarchy [member] | Hedging instruments [member] | Derivatives [member] | Financial liabilities at fair value through profit or loss, mandatorily measured at fair value, category [member]    
Disclosure of fair value measurement of liabilities [line items]    
Liabilities 34,842 21,658
Recurring fair value measurement [member] | Level 2 of fair value hierarchy [member] | Hedging instruments [member] | Currency forward [member] | Financial liabilities at fair value through profit or loss, mandatorily measured at fair value, category [member]    
Disclosure of fair value measurement of liabilities [line items]    
Liabilities 9,741 5,250
Recurring fair value measurement [member] | Level 2 of fair value hierarchy [member] | Hedging instruments [member] | Interest rate swap contract [member] | Financial liabilities at fair value through profit or loss, mandatorily measured at fair value, category [member]    
Disclosure of fair value measurement of liabilities [line items]    
Liabilities $ 25,101 $ 16,408