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RISK MANAGEMENT - Risk management - Regulatory (Details) - Measure Trading Risk Method - COP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Banco de Bogota S.A.    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value $ 318,203 $ 639,228
Basis points of regulatory capital (as a percent) 0.52% 1.11%
Banco de Occidente S.A.    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value $ 381,972 $ 218,355
Basis points of regulatory capital (as a percent) 1.13% 0.67%
Banco AV Villas S.A.    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value $ 22,567 $ 47,004
Basis points of regulatory capital (as a percent) 0.26% 0.55%
Banco Popular S.A.    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value $ 291,145 $ 336,718
Basis points of regulatory capital (as a percent) 1.52% 1.85%
Corficolombiana S.A.    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value $ 320,096 $ 240,068
Basis points of regulatory capital (as a percent) 6.74% 5.19%
Porvenir S.A.    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value $ 3,832 $ 10,927
Basis points of regulatory capital (as a percent) 0.57% 0.92%
Aval Casa de Bolsa S.A    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value $ 6,790 $ 3,598
Basis points of regulatory capital (as a percent) 0.58% 0.48%
Aval Fiduciaria S.A    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Value $ 717 $ 865
Basis points of regulatory capital (as a percent) 0.85% 1.44%