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REPORTING ENTITY - Spin off BAC Holding - Realization of other comprehensive income (Details) - COP ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Other Comprehensive Income items which were reclassified to profit or loss        
Hedged items   $ (797,514) $ (6,675,329) $ 2,565,637
Hedging derivative instruments     4,051,499 (403,983)
Hedging non-derivative instruments   760,997 2,549,821 (1,198,919)
Foreign currency translation differences from unhedged foreign operations   (409,671) 1,356,213 (180,798)
Unrealized gains on debt securities at FVOCI   1,795,666 (2,187,495) (1,346,315)
Income tax expense   (818,733) (1,926,071) 1,089,263
Total other comprehensive income that will be reclassified to profit or loss, net of tax   $ 458,930 (2,752,028) $ 532,019
BAC Holding International Corp        
Other Comprehensive Income items which were reclassified to profit or loss        
Total other comprehensive income that will be reclassified to profit or loss, net of tax     $ 1,429,325  
BAC Holding International Corp | Ifrs Discontinued Operations, Disposed of by Means Other than Sale, Spinoff [Member]        
Other Comprehensive Income items which were reclassified to profit or loss        
Hedged items $ 6,551,200      
Hedging derivative instruments (4,013,210)      
Hedging non-derivative instruments (2,761,143)      
Foreign currency translation differences from unhedged foreign operations (1,267,033)      
Unrealized gains on debt securities at FVOCI 98,947      
Income tax expense 2,443,861      
Total other comprehensive income that will be reclassified to profit or loss, net of tax 1,052,622      
Total other comprehensive income that will be reclassified to profit or loss, net of tax - Attributable to owners of the parent 723,535      
Total reclassifications of Other Comprehensive Income to profit or loss - Attributable to non-controlling interest 329,087      
Total reclassifications of Other Comprehensive Income to retained earnings (7,735)      
Total reclassifications of Other Comprehensive Income to retained earnings - Attributable to owners of the parent (5,317)      
Total reclassifications of Other Comprehensive Income to retained earnings - Attributable to non-controlling interest $ (2,418)      
Proportion of ownership interest in subsidiary 68.74%