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RISK MANAGEMENT - Structural interest rate risk - Interest bearing liabilities (Details) - COP ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities $ 249,900,662 $ 247,219,098
Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 247,528,735 245,457,924
Later than one year [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 48,253,266 44,672,561
Floating interest rate [member] | Not later than one year [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 31,876,425 41,968,426
Floating interest rate [member] | Later than one year [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 23,699,745 21,464,096
Fixed interest rate [member] | Not later than one year [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 150,771,053 129,395,293
Fixed interest rate [member] | Later than one year [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 33,620,104 31,783,487
Non-interest [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 7,561,408 20,846,622
Financial liabilities at amortised cost, category [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 247,528,735 245,457,924
Customer deposits [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 181,987,396 173,341,149
Customer deposits [member] | Financial liabilities at amortised cost, category [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 181,987,396 173,341,149
Checking accounts [member] | Financial liabilities at amortised cost, category [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 23,809,859 25,932,053
Checking accounts [member] | Financial liabilities at amortised cost, category [member] | Floating interest rate [member] | Not later than one year [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 1,857,769 735,536
Checking accounts [member] | Financial liabilities at amortised cost, category [member] | Fixed interest rate [member] | Not later than one year [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 14,793,042 5,191,400
Checking accounts [member] | Financial liabilities at amortised cost, category [member] | Non-interest [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 7,159,048 20,005,117
Time deposits [member] | Financial liabilities at amortised cost, category [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 86,597,460 72,273,697
Time deposits [member] | Financial liabilities at amortised cost, category [member] | Later than one year [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 17,000,396 12,246,230
Time deposits [member] | Financial liabilities at amortised cost, category [member] | Floating interest rate [member] | Not later than one year [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 13,167,807 14,474,525
Time deposits [member] | Financial liabilities at amortised cost, category [member] | Floating interest rate [member] | Later than one year [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 5,711,093 5,887,596
Time deposits [member] | Financial liabilities at amortised cost, category [member] | Fixed interest rate [member] | Not later than one year [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 53,716,494 40,361,808
Time deposits [member] | Financial liabilities at amortised cost, category [member] | Fixed interest rate [member] | Later than one year [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 14,002,066 11,549,768
Saving deposits [member] | Financial liabilities at amortised cost, category [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 71,149,883 74,293,894
Saving deposits [member] | Financial liabilities at amortised cost, category [member] | Floating interest rate [member] | Not later than one year [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 8,492,708 10,472,330
Saving deposits [member] | Financial liabilities at amortised cost, category [member] | Floating interest rate [member] | Later than one year [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities   1,168,328
Saving deposits [member] | Financial liabilities at amortised cost, category [member] | Fixed interest rate [member] | Not later than one year [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 62,657,175 62,653,236
Other deposits [member] | Financial liabilities at amortised cost, category [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 430,194 841,505
Other deposits [member] | Financial liabilities at amortised cost, category [member] | Floating interest rate [member] | Not later than one year [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 12,379  
Other deposits [member] | Financial liabilities at amortised cost, category [member] | Fixed interest rate [member] | Not later than one year [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 15,455  
Other deposits [member] | Financial liabilities at amortised cost, category [member] | Non-interest [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 402,360 841,505
Financial obligations [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 65,541,339 72,116,775
Financial obligations [member] | Financial liabilities at amortised cost, category [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 65,541,339 72,116,775
Interbank and overnight funds [member] | Financial liabilities at amortised cost, category [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 15,081,920 9,087,921
Interbank and overnight funds [member] | Financial liabilities at amortised cost, category [member] | Later than one year [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 20,877 566,644
Interbank and overnight funds [member] | Financial liabilities at amortised cost, category [member] | Floating interest rate [member] | Not later than one year [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 1,023,612 2,611,592
Interbank and overnight funds [member] | Financial liabilities at amortised cost, category [member] | Floating interest rate [member] | Later than one year [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities   4,497,949
Interbank and overnight funds [member] | Financial liabilities at amortised cost, category [member] | Fixed interest rate [member] | Not later than one year [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 14,037,431 1,978,380
Interbank and overnight funds [member] | Financial liabilities at amortised cost, category [member] | Fixed interest rate [member] | Later than one year [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 20,877  
Leases contracts liabilities [member] | Financial liabilities at amortised cost, category [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 2,791,748 2,335,944
Leases contracts liabilities [member] | Financial liabilities at amortised cost, category [member] | Later than one year [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 2,654,153 2,192,398
Leases contracts liabilities [member] | Financial liabilities at amortised cost, category [member] | Floating interest rate [member] | Not later than one year [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 2,989 897,471
Leases contracts liabilities [member] | Financial liabilities at amortised cost, category [member] | Floating interest rate [member] | Later than one year [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 356,454 244,062
Leases contracts liabilities [member] | Financial liabilities at amortised cost, category [member] | Fixed interest rate [member] | Not later than one year [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 115,379 181,509
Leases contracts liabilities [member] | Financial liabilities at amortised cost, category [member] | Fixed interest rate [member] | Later than one year [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 2,316,926 1,012,902
Borrowing from banks and similar [member] | Financial liabilities at amortised cost, category [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 19,426,712 27,973,414
Borrowing from banks and similar [member] | Financial liabilities at amortised cost, category [member] | Later than one year [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 8,703,854 7,134,649
Borrowing from banks and similar [member] | Financial liabilities at amortised cost, category [member] | Floating interest rate [member] | Not later than one year [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 6,089,836 8,862,681
Borrowing from banks and similar [member] | Financial liabilities at amortised cost, category [member] | Floating interest rate [member] | Later than one year [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 7,158,457 1,987,704
Borrowing from banks and similar [member] | Financial liabilities at amortised cost, category [member] | Fixed interest rate [member] | Not later than one year [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 4,531,168 13,195,008
Borrowing from banks and similar [member] | Financial liabilities at amortised cost, category [member] | Fixed interest rate [member] | Later than one year [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 1,647,251 3,928,021
IFRS Long-term Debt [Member] | Financial liabilities at amortised cost, category [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 23,427,826 28,362,221
IFRS Long-term Debt [Member] | Financial liabilities at amortised cost, category [member] | Later than one year [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 18,750,525 21,310,556
IFRS Long-term Debt [Member] | Financial liabilities at amortised cost, category [member] | Floating interest rate [member] | Not later than one year [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 812,106 3,600,832
IFRS Long-term Debt [Member] | Financial liabilities at amortised cost, category [member] | Floating interest rate [member] | Later than one year [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 7,133,109 4,556,550
IFRS Long-term Debt [Member] | Financial liabilities at amortised cost, category [member] | Fixed interest rate [member] | Not later than one year [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 771,189 5,662,371
IFRS Long-term Debt [Member] | Financial liabilities at amortised cost, category [member] | Fixed interest rate [member] | Later than one year [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 14,711,422 14,542,468
Borrowing from development entities [member] | Financial liabilities at amortised cost, category [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 4,813,133 4,357,275
Borrowing from development entities [member] | Financial liabilities at amortised cost, category [member] | Later than one year [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 1,123,461 1,222,084
Borrowing from development entities [member] | Financial liabilities at amortised cost, category [member] | Floating interest rate [member] | Not later than one year [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 417,219 313,459
Borrowing from development entities [member] | Financial liabilities at amortised cost, category [member] | Floating interest rate [member] | Later than one year [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 3,340,632 3,121,907
Borrowing from development entities [member] | Financial liabilities at amortised cost, category [member] | Fixed interest rate [member] | Not later than one year [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities 133,720 171,581
Borrowing from development entities [member] | Financial liabilities at amortised cost, category [member] | Fixed interest rate [member] | Later than one year [member] | Interest rate risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Financial liabilities $ 921,562 $ 750,328