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RISK MANAGEMENT - Credit quality of financial assets (excluding loan portfolio) - Derivative instruments - Trading derivatives - Liabilities (Details) - COP ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of financial liabilities [line items]    
Financial liabilities $ 308,858,471 $ 271,975,564
Financial liabilities at fair value through profit or loss, category [member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 1,105,723 1,509,201
Trading derivatives [member] | Financial liabilities at fair value through profit or loss that meet definition of held for trading, category [member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 1,049,910 1,452,574
Derivatives [member] | Trading derivatives [member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 1,049,910 1,452,574
Derivatives [member] | Trading derivatives [member] | Financial liabilities at fair value through profit or loss that meet definition of held for trading, category [member]    
Disclosure of financial liabilities [line items]    
Notional amount 57,021,642 36,465,423
Financial liabilities 1,049,910 1,452,574
Derivatives [member] | Trading derivatives [member] | Financial liabilities at fair value through profit or loss that meet definition of held for trading, category [member] | Central counterparties [member]    
Disclosure of financial liabilities [line items]    
Notional amount 11,681,893 5,225,408
Financial liabilities $ 8,648 $ 1,165