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RISK MANAGEMENT - Investment debt securities - Concentration by sector (Details) - COP ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of financial assets [line items]    
Financial assets $ 304,853,883 $ 280,746,878
Financial assets at fair value through profit or loss, category [member]    
Disclosure of financial assets [line items]    
Financial assets 24,400,493 19,332,588
Financial assets at amortised cost, category [member]    
Disclosure of financial assets [line items]    
Financial assets 251,981,889 236,970,165
Financial assets measured at fair value through other comprehensive income, category [member]    
Disclosure of financial assets [line items]    
Financial assets 27,050,198 23,326,776
Investment securities [member]    
Disclosure of financial assets [line items]    
Financial assets 39,162,618 34,425,693
Investment securities [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 39,181,293 34,442,575
Investment securities [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 10,708,367 9,996,561
Trading securities [member]    
Disclosure of financial assets [line items]    
Financial assets 20,163,214 15,451,121
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 20,163,214 15,451,121
Investment securities at fair value [member]    
Disclosure of financial assets [line items]    
Financial assets 28,472,926 24,446,014
Debt securities [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 49,697,404 40,438,606
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 1,889
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 10,708,367 9,996,561
Debt securities [member] | Investment securities [member] | Financial assets at amortised cost, category [member] | Colombia, Pesos | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 8,149,660 7,716,453
Debt securities [member] | Investment securities [member] | Financial assets at amortised cost, category [member] | Foreign currency [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 2,558,707 2,280,108
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 27,050,198 23,326,776
Debt securities [member] | Trading securities [member]    
Disclosure of financial assets [line items]    
Financial assets 11,937,414 7,113,380
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 11,937,414 7,113,380
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 11,937,414 7,113,380
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] | Colombia, Pesos | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 11,695,047 6,814,588
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] | Foreign currency [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 242,367 298,792
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 1,889
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] | Colombia, Pesos    
Disclosure of financial assets [line items]    
Financial assets 1,425 1,889
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 27,050,198 23,326,776
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 27,050,198 23,326,776
Debt securities [member] | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Colombia, Pesos | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 16,400,896 15,949,853
Debt securities [member] | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Foreign currency [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 10,649,302 7,376,923
Securities issued or secured by Colombian Government | Investment securities [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 2,553,693 2,567,463
Securities issued or secured by Colombian Government | Investment securities [member] | Financial assets at amortised cost, category [member] | Colombia, Pesos | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 2,553,693 2,567,463
Securities issued or secured by Colombian Government | 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 10,641,558 5,794,832
Securities issued or secured by Colombian Government | Trading securities [member] | Financial assets at fair value through profit or loss, classified as held for trading, category, International Financial Reporting Standards 9 [member] | Colombia, Pesos | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 10,623,734 5,732,620
Securities issued or secured by Colombian Government | Trading securities [member] | Financial assets at fair value through profit or loss, classified as held for trading, category, International Financial Reporting Standards 9 [member] | Foreign currency [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 17,824 62,212
Securities issued or secured by Colombian Government | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Colombia, Pesos | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 15,207,640 14,491,881
Securities issued or secured by Colombian Government | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Foreign currency [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 3,060,268 2,298,912
Securities issued or secured by other Colombian Government entities | Investment securities [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 5,563,208 5,112,355
Securities issued or secured by other Colombian Government entities | Investment securities [member] | Financial assets at amortised cost, category [member] | Colombia, Pesos | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 5,563,208 5,112,355
Securities issued or secured by other Colombian Government entities | 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 183,760 155,737
Securities issued or secured by other Colombian Government entities | Trading securities [member] | Financial assets at fair value through profit or loss, classified as held for trading, category, International Financial Reporting Standards 9 [member] | Colombia, Pesos | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 183,760 155,737
Securities issued or secured by other Colombian Government entities | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Colombia, Pesos | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 173,682 325,588
Securities issued or secured by other Colombian Government entities | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Foreign currency [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 289,063 538,200
Securities issued or secured by foreign Governments | Investment securities [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 30,655 26,515
Securities issued or secured by foreign Governments | Investment securities [member] | Financial assets at amortised cost, category [member] | Foreign currency [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 30,655 26,515
Securities issued or secured by foreign Governments | 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 75,379 32,079
Securities issued or secured by foreign Governments | Trading securities [member] | Financial assets at fair value through profit or loss, classified as held for trading, category, International Financial Reporting Standards 9 [member] | Foreign currency [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 75,379 32,079
Securities issued or secured by foreign Governments | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Foreign currency [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 4,502,810 2,507,038
Securities issued by central banks | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Foreign currency [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 204,855 145,489
Securities issued or secured by other financial entities | Investment securities [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 2,350,549 2,082,993
Securities issued or secured by other financial entities | Investment securities [member] | Financial assets at amortised cost, category [member] | Foreign currency [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 2,350,549 2,082,993
Securities issued or secured by other financial entities | 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 1,002,194 1,084,461
Securities issued or secured by other financial entities | Trading securities [member] | Financial assets at fair value through profit or loss, classified as held for trading, category, International Financial Reporting Standards 9 [member] | Colombia, Pesos | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 864,036 902,652
Securities issued or secured by other financial entities | Trading securities [member] | Financial assets at fair value through profit or loss, classified as held for trading, category, International Financial Reporting Standards 9 [member] | Foreign currency [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 138,158 181,809
Securities issued or secured by other financial entities | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Colombia, Pesos | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 813,342 918,788
Securities issued or secured by other financial entities | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Foreign currency [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 1,813,441 1,223,859
Securities issued by entities of the non-financial sector entities | Investment securities [member] | Financial assets at amortised cost, category [member] | Foreign currency [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 145,553 143,410
Securities issued by entities of the non-financial sector entities | 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 8,813 6,406
Securities issued by entities of the non-financial sector entities | Trading securities [member] | Financial assets at fair value through profit or loss, classified as held for trading, category, International Financial Reporting Standards 9 [member] | Colombia, Pesos | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 7,749 2,994
Securities issued by entities of the non-financial sector entities | Trading securities [member] | Financial assets at fair value through profit or loss, classified as held for trading, category, International Financial Reporting Standards 9 [member] | Foreign currency [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 1,064 3,412
Securities issued by entities of the non-financial sector entities | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Colombia, Pesos | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 3,968 961
Securities issued by entities of the non-financial sector entities | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Foreign currency [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 245,692 213,610
Other debt securities | Investment securities [member] | Financial assets at amortised cost, category [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 64,709 63,825
Other debt securities | Investment securities [member] | Financial assets at amortised cost, category [member] | Colombia, Pesos | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 32,759 36,635
Other debt securities | Investment securities [member] | Financial assets at amortised cost, category [member] | Foreign currency [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 31,950 27,190
Other debt securities | 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 25,710 39,865
Other debt securities | Trading securities [member] | Financial assets at fair value through profit or loss, classified as held for trading, category, International Financial Reporting Standards 9 [member] | Colombia, Pesos | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 15,768 20,585
Other debt securities | Trading securities [member] | Financial assets at fair value through profit or loss, classified as held for trading, category, International Financial Reporting Standards 9 [member] | Foreign currency [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 9,942 19,280
Other debt securities | 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 1,889
Other debt securities | Investment securities at fair value [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Colombia, Pesos    
Disclosure of financial assets [line items]    
Financial assets 1,425 1,889
Other debt securities | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Colombia, Pesos | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 202,264 212,635
Other debt securities | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Foreign currency [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets $ 533,173 $ 449,815