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REPORTING ENTITY - Spin off BAC Holding - Discontinued operations cash flow (Details) - COP ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of analysis of single amount of discontinued operations [line items]        
Net income from discontinued operations, net of tax     $ 866,166 $ 1,627,312
Reconciliation of net income before taxes and net cash (used) provided by operating activities:        
Effect of realization OCI to income   $ 458,930 (2,752,028) 532,019
Net cash provided (used in) operating activities   6,005,501 (222,124) 5,901,630
Cash flows from investing activities:        
Net cash Provided (used) in investing activities   1,840,647 (13,012,475) (6,601,941)
Decrease in cash and cash equivalents     (1,393,602)  
Increase (decrease) in cash and cash equivalents   1,565,004 (19,609,972) 2,617,294
Cash and cash equivalents at beginning of year $ 36,642,829 17,032,857 36,642,829 34,025,535
Cash and cash equivalents at end of year   $ 18,597,861 17,032,857 36,642,829
BAC Holding International Corp        
Disclosure of analysis of single amount of discontinued operations [line items]        
Net income from discontinued operations, net of tax     866,166  
Reconciliation of net income before taxes and net cash (used) provided by operating activities:        
Effect of realization OCI to income     1,429,325  
Discontinued operation participation in results     (563,159)  
BAC Holding International Corp | Ifrs Discontinued Operations, Disposed of by Means Other than Sale, Spinoff [Member]        
Disclosure of analysis of single amount of discontinued operations [line items]        
Net income from discontinued operations, net of tax 1,597,512      
Reconciliation of net income before taxes and net cash (used) provided by operating activities:        
Effect of realization OCI to income 1,052,622      
Discontinued operation participation in results 544,890      
Cash flows from investing activities:        
Loss of control in subsidiary (17,570,390)      
Net cash Provided (used) in investing activities (17,570,390)      
Decrease in cash and cash equivalents (1,393,602)      
Increase (decrease) in cash and cash equivalents (18,963,992)      
Cash and cash equivalents at beginning of year 18,963,992   $ 18,963,992  
Cash and cash equivalents at end of year $ 17,570,390     $ 18,963,992