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CUSTOMER DEPOSITS - Deposits - Tabular disclosure (Details) - COP ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of customer deposits [line items]    
Checking accounts $ 23,809,859 $ 25,932,053
Savings accounts 71,149,883 74,293,894
Other funds on demand 430,194 841,505
Total demand deposits 95,389,936 101,067,452
Balances on term deposits from customers 86,597,460 72,273,697
Total deposits from customers 181,987,396 173,341,149
Colombia, Pesos    
Disclosure of customer deposits [line items]    
Total deposits from customers 154,916,985 142,071,530
Foreign currency [member]    
Disclosure of customer deposits [line items]    
Total deposits from customers $ 27,070,411 $ 31,269,619