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RISK MANAGEMENT - Structural foreign exchange risk - Financial assets (Details)
$ in Millions, $ in Millions
Dec. 31, 2023
COP ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
COP ($)
Dec. 31, 2022
USD ($)
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Financial assets $ 280,746,878   $ 274,682,875  
Currency risk [member]        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Financial assets 50,519,047 $ 13,159 58,122,395 $ 11,985
Other Currency [Member] | Currency risk [member]        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Financial assets   60   98
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 at amortised cost, category [member]        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Financial assets 236,970,165   235,373,468  
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  
Investment securities [member]        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Financial assets 34,425,693   33,674,477  
Loan portfolio [member] | Financial assets at amortised cost, category [member]        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Financial assets 176,168,055   179,115,847  
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Currency risk [member]        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Financial assets 30,739,665 8,043 35,699,330 7,421
Loan portfolio [member] | Financial assets at amortised cost, category [member] | Other Currency [Member] | Currency risk [member]        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Financial assets       1
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  
Trade receivables [member] | Currency risk [member]        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Financial assets 2,748,599 719 3,694,659 705
Trade receivables [member] | Other Currency [Member] | Currency risk [member]        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Financial assets       63
IFRS Cash and Cash Equivalents [Member]        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Financial assets 18,597,861   17,032,857  
IFRS Cash and Cash Equivalents [Member] | Financial assets at amortised cost, category [member]        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Financial assets 18,597,861   17,032,857  
IFRS Cash and Cash Equivalents [Member] | Financial assets at amortised cost, category [member] | Currency risk [member]        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Financial assets 4,996,706 1,248 5,972,792 1,208
IFRS Cash and Cash Equivalents [Member] | Financial assets at amortised cost, category [member] | Other Currency [Member] | Currency risk [member]        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Financial assets   60   34
Debt securities [member] | Investment securities [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 [member] | Financial assets at amortised cost, category [member] | Currency risk [member]        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Financial assets 2,280,108 597 2,923,279 608
Debt securities [member] | Investment securities [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] | 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] | Currency risk [member]        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Financial assets 298,792 78 180,032 37
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 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] | Currency risk [member]        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Financial assets 7,376,923 1,930 8,135,015 1,691
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] | 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] | Currency risk [member]        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Financial assets 2,077,567 $ 544 1,512,459 314
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] | Currency risk [member]        
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Financial assets $ 687   $ 4,829 $ 1