v3.26.1
RISK MANAGEMENT - Concentrations of credit risk - Concentration by country (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 amortised cost, category [member]        
Disclosure of financial assets [line items]        
Financial assets 243,432,271 251,981,889    
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
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | COLOMBIA        
Disclosure of financial assets [line items]        
Financial assets 181,636,625 172,225,134    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | PANAMA        
Disclosure of financial assets [line items]        
Financial assets 1,476,043 17,458,657    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | COSTA RICA        
Disclosure of financial assets [line items]        
Financial assets 176,154 127,701    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | GUATEMALA        
Disclosure of financial assets [line items]        
Financial assets 310,287 432,151    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | UNITED STATES        
Disclosure of financial assets [line items]        
Financial assets 6,401,245 6,787,025    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | HONDURAS        
Disclosure of financial assets [line items]        
Financial assets 64,863 392,236    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | EL SALVADOR        
Disclosure of financial assets [line items]        
Financial assets 123,951 13,919    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | NICARAGUA        
Disclosure of financial assets [line items]        
Financial assets   412    
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Other countries        
Disclosure of financial assets [line items]        
Financial assets 2,466,775 2,698,890    
Loans to corporate entities [member] | Financial assets at amortised cost, category [member]        
Disclosure of financial assets [line items]        
Financial assets 105,824,421 110,756,010    
Loans to corporate entities [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 110,086,500 116,119,698    
Commercial lending portfolio [member] | Financial assets at amortised cost, category [member]        
Disclosure of financial assets [line items]        
Financial assets 104,047,053 110,051,750    
Commercial lending portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 108,308,984 115,414,643 107,047,817 104,775,099
Commercial lending portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | COLOMBIA        
Disclosure of financial assets [line items]        
Financial assets 98,000,384 95,610,708    
Commercial lending portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | PANAMA        
Disclosure of financial assets [line items]        
Financial assets 773,506 9,455,147    
Commercial lending portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | COSTA RICA        
Disclosure of financial assets [line items]        
Financial assets 176,154 125,689    
Commercial lending portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | GUATEMALA        
Disclosure of financial assets [line items]        
Financial assets 310,287 432,151    
Commercial lending portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | UNITED STATES        
Disclosure of financial assets [line items]        
Financial assets 6,393,092 6,685,567    
Commercial lending portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | HONDURAS        
Disclosure of financial assets [line items]        
Financial assets 64,863 392,236    
Commercial lending portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | EL SALVADOR        
Disclosure of financial assets [line items]        
Financial assets 123,951 13,919    
Commercial lending portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | NICARAGUA        
Disclosure of financial assets [line items]        
Financial assets   412    
Commercial lending portfolio [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Other countries        
Disclosure of financial assets [line items]        
Financial assets 2,466,747 2,698,814    
Interbank and overnight funds [member] | Financial assets at amortised cost, category [member]        
Disclosure of financial assets [line items]        
Financial assets 1,777,368 704,260    
Interbank and overnight funds [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 1,777,516 705,055 392,607 5,967,743
Interbank and overnight funds [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | COLOMBIA        
Disclosure of financial assets [line items]        
Financial assets 1,075,072 395,382    
Interbank and overnight funds [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | PANAMA        
Disclosure of financial assets [line items]        
Financial assets 702,444 214,187    
Interbank and overnight funds [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | COSTA RICA        
Disclosure of financial assets [line items]        
Financial assets   2,012    
Interbank and overnight funds [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | UNITED STATES        
Disclosure of financial assets [line items]        
Financial assets   93,474    
Loans to consumers [member] | Financial assets at amortised cost, category [member]        
Disclosure of financial assets [line items]        
Financial assets 56,791,437 57,810,307    
Loans to consumers [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 60,456,213 61,976,325 59,999,611 59,419,444
Loans to consumers [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | COLOMBIA        
Disclosure of financial assets [line items]        
Financial assets 60,447,939 57,719,813    
Loans to consumers [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | PANAMA        
Disclosure of financial assets [line items]        
Financial assets 93 4,248,452    
Loans to consumers [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | UNITED STATES        
Disclosure of financial assets [line items]        
Financial assets 8,153 7,984    
Loans to consumers [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | Other countries        
Disclosure of financial assets [line items]        
Financial assets 28 76    
Mortgages [member] | Financial assets at amortised cost, category [member]        
Disclosure of financial assets [line items]        
Financial assets 21,609,555 21,562,412    
Mortgages [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 22,111,710 22,035,727 18,486,206 17,883,355
Mortgages [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | COLOMBIA        
Disclosure of financial assets [line items]        
Financial assets 22,111,710 18,494,856    
Mortgages [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | PANAMA        
Disclosure of financial assets [line items]        
Financial assets   3,540,871    
Microcredit [member] | Financial assets at amortised cost, category [member]        
Disclosure of financial assets [line items]        
Financial assets 560 757    
Microcredit [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Financial assets 1,520 4,375 $ 277,529 $ 267,720
Microcredit [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member] | COLOMBIA        
Disclosure of financial assets [line items]        
Financial assets $ 1,520 $ 4,375