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RISK MANAGEMENT - Trading book risk - Assets (Details) - COP ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets $ 280,746,878 $ 274,682,875
Market risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 32,568,274 28,286,329
Financial assets at fair value through profit or loss, category [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 19,332,588 15,370,870
Financial assets measured at fair value through other comprehensive income, category [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 23,326,776 22,461,805
Trading securities [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 15,451,121 11,841,407
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 nature and extent of risks arising from financial instruments [line items]    
Financial assets 15,451,121 11,841,407
Investment securities at fair value [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 24,446,014 23,939,915
Debt securities [member] | Market risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 30,442,045 26,224,070
Debt securities [member] | Trading securities [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 7,113,380 3,760,887
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 nature and extent of risks arising from financial instruments [line items]    
Financial assets 7,113,380 3,760,887
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] | Market risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 7,113,380 3,760,887
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 nature and extent of risks arising from financial instruments [line items]    
Financial assets 1,889 1,378
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] | Market risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 1,889 1,378
Debt securities [member] | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 23,326,776 22,461,805
Debt securities [member] | Investment securities at fair value [member] | Financial assets measured at fair value through other comprehensive income, category [member] | Market risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 23,326,776 22,461,805
Derivatives [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 2,126,229 2,062,259
Derivatives [member] | Market risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 2,126,229 2,062,259
Derivatives [member] | Trading securities [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 2,077,567 2,041,405
Derivatives [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 nature and extent of risks arising from financial instruments [line items]    
Financial assets 2,077,567 2,041,405
Derivatives [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] | Market risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 2,077,567 2,041,405
Derivatives [member] | Hedging instruments [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets 48,662 20,854
Derivatives [member] | Hedging instruments [member] | Financial assets 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 assets 48,662 20,854
Derivatives [member] | Hedging instruments [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Market risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial assets $ 48,662 $ 20,854