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FAIR VALUE OF ASSETS AND LIABILITIES - Significant unobservable inputs and and the sensitivity of these fair values (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2022
COP ($)
Dec. 31, 2021
COP ($)
Dec. 31, 2020
item
Dec. 31, 2019
item
Debt instruments | Securities issued by other financial institutions        
FAIR VALUE OF ASSETS AND LIABILITIES        
Fair Value $ 81,389 $ 113,058    
Debt instruments | TIPS        
FAIR VALUE OF ASSETS AND LIABILITIES        
Fair Value 76,014 98,383    
Debt instruments | TIPS | Prepayment speed        
FAIR VALUE OF ASSETS AND LIABILITIES        
Sensitivity 100 basis point increase 77,349      
Debt instruments | TIPS | Discounted cash flow | Yield        
FAIR VALUE OF ASSETS AND LIABILITIES        
Sensitivity 100 basis point increase 71,208 96,097    
Sensitivity 100 basis point decrease $ 75,021 $ 100,779    
Debt instruments | TIPS | Discounted cash flow | Yield | Minimum        
FAIR VALUE OF ASSETS AND LIABILITIES        
Significant unobservable input, assets 0.0206 0.0014    
Debt instruments | TIPS | Discounted cash flow | Yield | Maximum        
FAIR VALUE OF ASSETS AND LIABILITIES        
Significant unobservable input, assets 0.0989   0.0546  
Debt instruments | TIPS | Discounted cash flow | Yield | Weighted average        
FAIR VALUE OF ASSETS AND LIABILITIES        
Significant unobservable input, assets 0.0493 0.0274    
Debt instruments | TIPS | Discounted cash flow | Prepayment speed        
FAIR VALUE OF ASSETS AND LIABILITIES        
Sensitivity 100 basis point increase   $ 95,889    
Sensitivity 100 basis point decrease   102,148    
Debt instruments | Other bonds        
FAIR VALUE OF ASSETS AND LIABILITIES        
Fair Value   9,635    
Debt instruments | Other bonds | Discounted cash flow | Yield        
FAIR VALUE OF ASSETS AND LIABILITIES        
Sensitivity 100 basis point increase   9,276    
Sensitivity 100 basis point decrease   $ 10,014    
Debt instruments | Other bonds | Discounted cash flow | Yield | Minimum        
FAIR VALUE OF ASSETS AND LIABILITIES        
Significant unobservable input, assets | item     0.0116  
Debt instruments | Other bonds | Discounted cash flow | Yield | Maximum        
FAIR VALUE OF ASSETS AND LIABILITIES        
Significant unobservable input, assets | item     0.0116  
Debt instruments | Other bonds | Discounted cash flow | Yield | Weighted average        
FAIR VALUE OF ASSETS AND LIABILITIES        
Significant unobservable input, assets   0.0116    
Debt instruments | Other bonds | Discounted cash flow | Liquidity risk        
FAIR VALUE OF ASSETS AND LIABILITIES        
Sensitivity 100 basis point increase   $ 9,281    
Sensitivity 100 basis point decrease   $ 10,008    
Debt instruments | Other bonds | Discounted cash flow | Liquidity risk | Minimum        
FAIR VALUE OF ASSETS AND LIABILITIES        
Significant unobservable input, assets | item     0.0255  
Debt instruments | Other bonds | Discounted cash flow | Liquidity risk | Maximum        
FAIR VALUE OF ASSETS AND LIABILITIES        
Significant unobservable input, assets | item     0.0255  
Debt instruments | Other bonds | Discounted cash flow | Liquidity risk | Weighted average        
FAIR VALUE OF ASSETS AND LIABILITIES        
Significant unobservable input, assets   0.0255    
Debt instruments | Time deposits        
FAIR VALUE OF ASSETS AND LIABILITIES        
Fair Value $ 5,375 $ 5,040    
Debt instruments | Time deposits | Discounted cash flow | Interest rate        
FAIR VALUE OF ASSETS AND LIABILITIES        
Sensitivity 100 basis point increase 5,033 4,989    
Sensitivity 100 basis point decrease $ 5,438 $ 5,053    
Debt instruments | Time deposits | Discounted cash flow | Interest rate | Minimum        
FAIR VALUE OF ASSETS AND LIABILITIES        
Significant unobservable input, assets 0.0410   0.0047  
Debt instruments | Time deposits | Discounted cash flow | Interest rate | Maximum        
FAIR VALUE OF ASSETS AND LIABILITIES        
Significant unobservable input, assets 0.0520     0.0425
Debt instruments | Time deposits | Discounted cash flow | Interest rate | Weighted average        
FAIR VALUE OF ASSETS AND LIABILITIES        
Significant unobservable input, assets 0.0500 0.0384    
Equity securities        
FAIR VALUE OF ASSETS AND LIABILITIES        
Fair Value $ 491,440 $ 335,006    
Derivative financial instruments        
FAIR VALUE OF ASSETS AND LIABILITIES        
Fair Value 792,922 747,583    
Forwards        
FAIR VALUE OF ASSETS AND LIABILITIES        
Fair Value 403,996 408,379    
Forwards | Discounted cash flow | Credit spread        
FAIR VALUE OF ASSETS AND LIABILITIES        
Sensitivity 100 basis point increase 405,806 406,899    
Sensitivity 100 basis point decrease $ 410,413 $ 409,594    
Forwards | Discounted cash flow | Credit spread | Minimum        
FAIR VALUE OF ASSETS AND LIABILITIES        
Significant unobservable input, assets 0 0    
Forwards | Discounted cash flow | Credit spread | Maximum        
FAIR VALUE OF ASSETS AND LIABILITIES        
Significant unobservable input, assets 0.5947 0.3281    
Forwards | Discounted cash flow | Credit spread | Weighted average        
FAIR VALUE OF ASSETS AND LIABILITIES        
Significant unobservable input, assets 0.1105 0.0683    
Swaps        
FAIR VALUE OF ASSETS AND LIABILITIES        
Fair Value $ 271,859 $ 294,821    
Swaps | Discounted cash flow | Credit spread        
FAIR VALUE OF ASSETS AND LIABILITIES        
Sensitivity 100 basis point increase 265,949 309,046    
Sensitivity 100 basis point decrease $ 278,192 $ 285,805    
Swaps | Discounted cash flow | Credit spread | Minimum        
FAIR VALUE OF ASSETS AND LIABILITIES        
Significant unobservable input, assets 0 0    
Swaps | Discounted cash flow | Credit spread | Maximum        
FAIR VALUE OF ASSETS AND LIABILITIES        
Significant unobservable input, assets 0.3933 0.2885    
Swaps | Discounted cash flow | Credit spread | Weighted average        
FAIR VALUE OF ASSETS AND LIABILITIES        
Significant unobservable input, assets 0.0785 0.0382    
Options        
FAIR VALUE OF ASSETS AND LIABILITIES        
Fair Value $ 117,067 $ 44,383    
Options | Discounted cash flow | Credit spread        
FAIR VALUE OF ASSETS AND LIABILITIES        
Sensitivity 100 basis point increase 116,182 44,048    
Sensitivity 100 basis point decrease $ 117,636 $ 44,575    
Options | Discounted cash flow | Credit spread | Minimum        
FAIR VALUE OF ASSETS AND LIABILITIES        
Significant unobservable input, assets 0.0010 0.0014    
Options | Discounted cash flow | Credit spread | Maximum        
FAIR VALUE OF ASSETS AND LIABILITIES        
Significant unobservable input, assets 0.3640 0.3757    
Options | Discounted cash flow | Credit spread | Weighted average        
FAIR VALUE OF ASSETS AND LIABILITIES        
Significant unobservable input, assets 0.0064 0.0063    
Investment in associates        
FAIR VALUE OF ASSETS AND LIABILITIES        
Fair Value $ 1,532,156 $ 1,358,368    
Investment in associates | P.A. Viva Malls        
FAIR VALUE OF ASSETS AND LIABILITIES        
Fair Value 1,530,459 1,355,688    
Investment in associates | P.A Distrito Vera        
FAIR VALUE OF ASSETS AND LIABILITIES        
Fair Value $ 1,697 $ 2,680