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INVESTMENTS IN ASSOCIATES AND JOINT VENTURES - Financial information of associates (Details) - COP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of associates [line items]        
Assets $ 327,859,383 $ 301,181,596    
Liabilities 294,696,465 269,661,180    
Equity 33,162,918 31,520,416 $ 30,821,659 $ 39,471,647
Income 46,492,667 47,658,238 37,274,770  
Expenses 44,301,190 45,481,122 32,405,637  
Net income for the year 2,191,477 2,177,116 $ 4,869,133  
Gas Natural de Lima y Callao S.A. - Calidda        
Disclosure of associates [line items]        
Assets 6,979,152 6,116,364    
Liabilities 5,251,752 4,521,154    
Equity 1,727,400 1,595,210    
Income 3,647,158 3,832,676    
Expenses 3,223,946 3,378,051    
Net income for the year 423,212 454,625    
Gases del Caribe S.A. E.S.P.        
Disclosure of associates [line items]        
Assets 4,578,075 4,066,193    
Liabilities 3,417,111 2,974,633    
Equity 1,160,964 1,091,560    
Income 3,590,647 3,104,261    
Expenses 3,213,198 2,730,690    
Net income for the year 377,449 373,571    
Credibanco S.A.        
Disclosure of associates [line items]        
Assets 443,908 431,534    
Liabilities 165,954 180,505    
Equity 277,954 251,029    
Income 410,808 329,109    
Expenses 377,354 293,021    
Net income for the year 33,454 36,088    
Redeban Multicolor S.A.        
Disclosure of associates [line items]        
Assets 9,622,497 2,101,985    
Liabilities 9,405,167 1,918,782    
Equity 217,330 183,203    
Income 565,481 443,196    
Expenses 534,150 423,438    
Net income for the year 31,331 19,758    
A.C.H Colombia S.A.        
Disclosure of associates [line items]        
Assets 999,582 342,153    
Liabilities 870,224 232,328    
Equity 129,358 109,825    
Income 371,014 292,592    
Expenses 251,664 184,168    
Net income for the year 119,350 108,424    
Aerocali S.A.        
Disclosure of associates [line items]        
Assets 125,470 92,950    
Liabilities 54,456 44,172    
Equity 71,014 48,778    
Income 259,537 254,751    
Expenses 207,302 209,945    
Net income for the year 52,235 44,806    
Colombiana de Extrusion S.A. - Extrucol        
Disclosure of associates [line items]        
Assets 115,757 112,151    
Liabilities 67,478 63,795    
Equity 48,279 48,356    
Income 161,882 183,121    
Expenses 146,334 167,562    
Net income for the year 15,548 15,559    
ADL Digital Lab S.A.S.        
Disclosure of associates [line items]        
Assets 89,275 71,577    
Liabilities 37,050 35,602    
Equity 52,225 35,975    
Income 100,662 74,645    
Expenses 84,412 63,492    
Net income for the year 16,250 11,153    
Servicios de Identidad Digital S.A.S.        
Disclosure of associates [line items]        
Assets 31,639 50,428    
Liabilities 17,367 22,812    
Equity 14,272 27,616    
Income 145 857    
Expenses 4,478 19,694    
Net income for the year (4,333) (18,837)    
Energia Eficiente S.A.        
Disclosure of associates [line items]        
Assets 112,296 124,797    
Liabilities 91,629 100,424    
Equity 20,667 24,373    
Income 256,529 328,840    
Expenses 256,235 325,794    
Net income for the year 294 3,046    
Metrex S.A.        
Disclosure of associates [line items]        
Assets 44,452 41,458    
Liabilities 32,841 29,170    
Equity 11,611 12,288    
Income 67,163 80,944    
Expenses 64,669 78,229    
Net income for the year $ 2,494 $ 2,715