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FINANCIAL INSTRUMENTS - Interest rate risk profit (Details) - IDR (Rp)
Rp in Billions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
FINANCIAL RISK MANAGEMENT    
Financial liabilities Rp (96,733.0) Rp (94,236.0)
Interest rate risk | Fixed rate borrowings    
FINANCIAL RISK MANAGEMENT    
Financial liabilities (26,734.0) (38,133.0)
Interest rate risk | Variable rate borrowings    
FINANCIAL RISK MANAGEMENT    
Financial liabilities Rp (37,988.0) Rp (28,824.0)
Increase in percent (as a percent) 0.25%  
Decrease in percent (as a percent) 0.25%  
Equity change Rp 95.0  
Equity change (95.0)  
Net income change 95.0  
Net income change Rp (95.0)