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INVESTMENT SECURITIES - Investments in debt securities at amortized cost (Details) - COP ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of financial assets [line items]    
Financial assets $ 280,746,878 $ 274,682,875
Investment securities [member]    
Disclosure of financial assets [line items]    
Financial assets 34,425,693 33,674,477
Investment securities [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 34,442,575 33,711,407
Financial assets at amortised cost, category [member]    
Disclosure of financial assets [line items]    
Financial assets 236,970,165 235,373,468
Financial assets at amortised cost, category [member] | Investment securities [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 9,996,561 9,771,492
Debt securities [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 40,438,606 35,995,562
Debt securities [member] | Financial assets at amortised cost, category [member] | Investment securities [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 9,996,561 9,771,492
Debt securities [member] | Financial assets at amortised cost, category [member] | Investment securities [member] | Not later than one month [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 927,454 768,921
Debt securities [member] | Financial assets at amortised cost, category [member] | Investment securities [member] | Later than one month and not later than three months [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 26,515 80,379
Debt securities [member] | Financial assets at amortised cost, category [member] | Investment securities [member] | Later than three months and not later than one year [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 6,765,886 6,032,434
Debt securities [member] | Financial assets at amortised cost, category [member] | Investment securities [member] | Later than one year and not later than five years [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 151,217 187,795
Debt securities [member] | Financial assets at amortised cost, category [member] | Investment securities [member] | Later than five years and not later than ten years [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 2,098,299 2,668,331
Debt securities [member] | Financial assets at amortised cost, category [member] | Investment securities [member] | Later than ten years [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 27,190 33,632
Securities issued or secured by Colombian Government | Financial assets at amortised cost, category [member] | Investment securities [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 2,567,463 2,299,618
Securities issued or secured by other Colombian Government entities | Financial assets at amortised cost, category [member] | Investment securities [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 5,112,355 4,509,839
Securities issued or secured by foreign Governments | Financial assets at amortised cost, category [member] | Investment securities [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 26,515 33,453
Securities issued or secured by other financial entities | Financial assets at amortised cost, category [member] | Investment securities [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 2,082,993 2,618,656
Other debt securities | Financial assets at amortised cost, category [member] | Investment securities [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets 63,825 72,389
Securities issued or secured by non-financial sector entities | Financial assets at amortised cost, category [member] | Investment securities [member] | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets $ 143,410 $ 237,537