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ESTIMATION OF FAIR VALUE - Transfers between level 1, level 2 and level 3 of the fair value hierarchy (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2022
COP ($)
Financial assets at fair value through profit or loss, classified as held for trading, category, International Financial Reporting Standards 9 [member]  
Disclosure of fair value measurement of assets [line items]  
Transfers out of Level 3 of fair value hierarchy, assets $ 57,600
Financial assets at fair value through profit or loss, classified as held for trading, category, International Financial Reporting Standards 9 [member] | Level two to one  
Disclosure of fair value measurement of assets [line items]  
Debt instruments held 2,826
Financial assets at fair value through profit or loss, classified as held for trading, category, International Financial Reporting Standards 9 [member] | Securities issued or secured by Colombian Government | Level two to one  
Disclosure of fair value measurement of assets [line items]  
Debt instruments held 2,826
Financial assets at fair value through profit or loss, classified as held for trading, category, International Financial Reporting Standards 9 [member] | Securities issued or secured by foreign Governments  
Disclosure of fair value measurement of assets [line items]  
Transfers out of Level 3 of fair value hierarchy, assets 57,600
Financial assets measured at fair value through other comprehensive income, category [member]  
Disclosure of fair value measurement of assets [line items]  
Transfers out of Level 3 of fair value hierarchy, assets 15,395
Financial assets measured at fair value through other comprehensive income, category [member] | Level two to one  
Disclosure of fair value measurement of assets [line items]  
Debt instruments held 2,149,975
Financial assets measured at fair value through other comprehensive income, category [member] | Level one to two  
Disclosure of fair value measurement of assets [line items]  
Debt instruments held 52,210
Financial assets measured at fair value through other comprehensive income, category [member] | Securities issued or secured by Colombian Government | Level two to one  
Disclosure of fair value measurement of assets [line items]  
Debt instruments held 1,836,591
Financial assets measured at fair value through other comprehensive income, category [member] | Securities issued or secured by other Colombian Government entities | Level two to one  
Disclosure of fair value measurement of assets [line items]  
Debt instruments held 287,490
Financial assets measured at fair value through other comprehensive income, category [member] | Securities issued or secured by foreign Governments | Level two to one  
Disclosure of fair value measurement of assets [line items]  
Debt instruments held 24,098
Financial assets measured at fair value through other comprehensive income, category [member] | Securities issued by entities of the non-financial sector entities  
Disclosure of fair value measurement of assets [line items]  
Transfers out of Level 3 of fair value hierarchy, assets 3,955
Financial assets measured at fair value through other comprehensive income, category [member] | Securities issued or secured by other financial entities  
Disclosure of fair value measurement of assets [line items]  
Transfers out of Level 3 of fair value hierarchy, assets 6,980
Financial assets measured at fair value through other comprehensive income, category [member] | Securities issued or secured by others [member]  
Disclosure of fair value measurement of assets [line items]  
Transfers out of Level 3 of fair value hierarchy, assets 4,460
Financial assets measured at fair value through other comprehensive income, category [member] | Securities issued or secured by others [member] | Level two to one  
Disclosure of fair value measurement of assets [line items]  
Debt instruments held 1,796
Financial assets measured at fair value through other comprehensive income, category [member] | Securities issued or secured by others [member] | Level one to two  
Disclosure of fair value measurement of assets [line items]  
Debt instruments held $ 52,210