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OPERATING INCOME - Revenue from contracts with customers (Details) - COP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Minimum      
OPERATING INCOME      
Intermediation margin 4.00%    
Maximum      
OPERATING INCOME      
Intermediation margin 10.00%    
Operating Segments      
Revenue from contracts with customers      
Revenue from contracts with customers $ 6,370,526 $ 5,293,804 $ 4,598,413
Operating Segments | Credit and debit card fees and commercial establishments      
Revenue from contracts with customers      
Revenue from contracts with customers 2,779,760 2,236,121 1,845,867
Operating Segments | Bancassurance      
Revenue from contracts with customers      
Revenue from contracts with customers 872,677 686,592 728,642
Operating Segments | Payment and collections      
Revenue from contracts with customers      
Revenue from contracts with customers 865,958 733,361 595,222
Operating Segments | Banking services      
Revenue from contracts with customers      
Revenue from contracts with customers 837,361 682,231 582,845
Operating Segments | Trust      
Revenue from contracts with customers      
Revenue from contracts with customers 423,702 463,123 454,250
Operating Segments | Placement of securities and investment banking      
Revenue from contracts with customers      
Revenue from contracts with customers 103,923 94,353 52,036
Operating Segments | Acceptances, Guarantees and Standby Letters of Credit      
Revenue from contracts with customers      
Revenue from contracts with customers 91,358 72,549 61,774
Operating Segments | Brokerage      
Revenue from contracts with customers      
Revenue from contracts with customers 27,848 26,854 28,364
Operating Segments | Others      
Revenue from contracts with customers      
Revenue from contracts with customers 367,939 298,620 249,413
Operating Segments | Banking Colombia      
Revenue from contracts with customers      
Revenue from contracts with customers 4,684,563 3,841,472 3,291,382
Operating Segments | Banking Colombia | Credit and debit card fees and commercial establishments      
Revenue from contracts with customers      
Revenue from contracts with customers 2,248,727 1,830,128 1,484,085
Operating Segments | Banking Colombia | Bancassurance      
Revenue from contracts with customers      
Revenue from contracts with customers 814,653 636,632 685,783
Operating Segments | Banking Colombia | Payment and collections      
Revenue from contracts with customers      
Revenue from contracts with customers 851,983 723,297 595,222
Operating Segments | Banking Colombia | Banking services      
Revenue from contracts with customers      
Revenue from contracts with customers 481,103 414,870 329,281
Operating Segments | Banking Colombia | Trust      
Revenue from contracts with customers      
Revenue from contracts with customers     844
Operating Segments | Banking Colombia | Acceptances, Guarantees and Standby Letters of Credit      
Revenue from contracts with customers      
Revenue from contracts with customers 58,293 43,863 38,864
Operating Segments | Banking Colombia | Others      
Revenue from contracts with customers      
Revenue from contracts with customers 229,804 192,682 157,303
Operating Segments | Banking Panama      
Revenue from contracts with customers      
Revenue from contracts with customers 446,583 351,603 310,773
Operating Segments | Banking Panama | Credit and debit card fees and commercial establishments      
Revenue from contracts with customers      
Revenue from contracts with customers 232,637 174,226 147,448
Operating Segments | Banking Panama | Bancassurance      
Revenue from contracts with customers      
Revenue from contracts with customers 57,858 49,730 42,697
Operating Segments | Banking Panama | Payment and collections      
Revenue from contracts with customers      
Revenue from contracts with customers 13,975 10,064  
Operating Segments | Banking Panama | Banking services      
Revenue from contracts with customers      
Revenue from contracts with customers 91,938 69,379 77,727
Operating Segments | Banking Panama | Trust      
Revenue from contracts with customers      
Revenue from contracts with customers 18,975 17,420 18,089
Operating Segments | Banking Panama | Placement of securities and investment banking      
Revenue from contracts with customers      
Revenue from contracts with customers 550 1,998 789
Operating Segments | Banking Panama | Acceptances, Guarantees and Standby Letters of Credit      
Revenue from contracts with customers      
Revenue from contracts with customers 18,382 16,125 13,976
Operating Segments | Banking Panama | Brokerage      
Revenue from contracts with customers      
Revenue from contracts with customers 11,888 12,661 10,047
Operating Segments | Banking Panama | Others      
Revenue from contracts with customers      
Revenue from contracts with customers 380    
Operating Segments | Banking El Salvador      
Revenue from contracts with customers      
Revenue from contracts with customers 444,177 359,724 289,792
Operating Segments | Banking El Salvador | Credit and debit card fees and commercial establishments      
Revenue from contracts with customers      
Revenue from contracts with customers 216,977 168,273 126,857
Operating Segments | Banking El Salvador | Bancassurance      
Revenue from contracts with customers      
Revenue from contracts with customers 97 129 139
Operating Segments | Banking El Salvador | Banking services      
Revenue from contracts with customers      
Revenue from contracts with customers 142,047 118,532 105,821
Operating Segments | Banking El Salvador | Trust      
Revenue from contracts with customers      
Revenue from contracts with customers 6,522 6,567 1,868
Operating Segments | Banking El Salvador | Placement of securities and investment banking      
Revenue from contracts with customers      
Revenue from contracts with customers 1,482 1,353 1,723
Operating Segments | Banking El Salvador | Acceptances, Guarantees and Standby Letters of Credit      
Revenue from contracts with customers      
Revenue from contracts with customers 10,081 6,928 5,112
Operating Segments | Banking El Salvador | Others      
Revenue from contracts with customers      
Revenue from contracts with customers 66,971 57,942 48,272
Operating Segments | Banking Guatemala      
Revenue from contracts with customers      
Revenue from contracts with customers 218,554 159,908 176,268
Operating Segments | Banking Guatemala | Credit and debit card fees and commercial establishments      
Revenue from contracts with customers      
Revenue from contracts with customers 79,551 61,831 85,643
Operating Segments | Banking Guatemala | Banking services      
Revenue from contracts with customers      
Revenue from contracts with customers 78,264 56,548 49,782
Operating Segments | Banking Guatemala | Trust      
Revenue from contracts with customers      
Revenue from contracts with customers 803 704 788
Operating Segments | Banking Guatemala | Acceptances, Guarantees and Standby Letters of Credit      
Revenue from contracts with customers      
Revenue from contracts with customers 3,774 3,716 2,713
Operating Segments | Banking Guatemala | Brokerage      
Revenue from contracts with customers      
Revenue from contracts with customers     9
Operating Segments | Banking Guatemala | Others      
Revenue from contracts with customers      
Revenue from contracts with customers 56,162 37,109 37,333
Operating Segments | Trust      
Revenue from contracts with customers      
Revenue from contracts with customers 318,869 347,878 349,150
Operating Segments | Trust | Bancassurance      
Revenue from contracts with customers      
Revenue from contracts with customers 29 40 8
Operating Segments | Trust | Trust      
Revenue from contracts with customers      
Revenue from contracts with customers 318,840 347,838 349,127
Operating Segments | Trust | Others      
Revenue from contracts with customers      
Revenue from contracts with customers     15
Operating Segments | Investment Banking      
Revenue from contracts with customers      
Revenue from contracts with customers 86,232 79,531 37,447
Operating Segments | Investment Banking | Bancassurance      
Revenue from contracts with customers      
Revenue from contracts with customers 8 10 3
Operating Segments | Investment Banking | Placement of securities and investment banking      
Revenue from contracts with customers      
Revenue from contracts with customers 86,224 79,521 37,354
Operating Segments | Investment Banking | Others      
Revenue from contracts with customers      
Revenue from contracts with customers     90
Operating Segments | Brokerage      
Revenue from contracts with customers      
Revenue from contracts with customers 111,366 117,282 112,628
Operating Segments | Brokerage | Bancassurance      
Revenue from contracts with customers      
Revenue from contracts with customers 32 51 12
Operating Segments | Brokerage | Trust      
Revenue from contracts with customers      
Revenue from contracts with customers 78,509 90,548 81,373
Operating Segments | Brokerage | Placement of securities and investment banking      
Revenue from contracts with customers      
Revenue from contracts with customers 15,667 11,481 12,170
Operating Segments | Brokerage | Brokerage      
Revenue from contracts with customers      
Revenue from contracts with customers 15,960 14,193 18,308
Operating Segments | Brokerage | Others      
Revenue from contracts with customers      
Revenue from contracts with customers 1,198 1,009 765
Operating Segments | International Banking      
Revenue from contracts with customers      
Revenue from contracts with customers 42,021 33,309 28,896
Operating Segments | International Banking | Credit and debit card fees and commercial establishments      
Revenue from contracts with customers      
Revenue from contracts with customers 1,868 1,663 1,834
Operating Segments | International Banking | Banking services      
Revenue from contracts with customers      
Revenue from contracts with customers 31,277 22,902 20,234
Operating Segments | International Banking | Trust      
Revenue from contracts with customers      
Revenue from contracts with customers 53 46 46
Operating Segments | International Banking | Acceptances, Guarantees and Standby Letters of Credit      
Revenue from contracts with customers      
Revenue from contracts with customers 828 1,917 1,109
Operating Segments | International Banking | Others      
Revenue from contracts with customers      
Revenue from contracts with customers 7,995 6,781 5,673
Operating Segments | All other segments      
Revenue from contracts with customers      
Revenue from contracts with customers 18,161 3,097 2,077
Operating Segments | All other segments | Banking services      
Revenue from contracts with customers      
Revenue from contracts with customers 12,732    
Operating Segments | All other segments | Trust      
Revenue from contracts with customers      
Revenue from contracts with customers     2,115
Operating Segments | All other segments | Others      
Revenue from contracts with customers      
Revenue from contracts with customers $ 5,429 $ 3,097 $ (38)