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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Components of net periodic pension benefit cost (Details) - IDR (Rp)
Rp in Millions
12 Months Ended
Sep. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of defined benefit plans [line items]        
Threshold minimum pension benefits Rp 1      
The company | Retired before end of June 2002        
Disclosure of defined benefit plans [line items]        
Maximum monthly pension benefits, settlements made   Rp 65,000 Rp 80,000  
The company | Funded pension        
Disclosure of defined benefit plans [line items]        
Percentage of companies share in total plan assets   1.78% 2.16%  
Percentage of Debt Instruments Contributed to Fair Value of Plan Assets   1.84% 1.88%  
Actual return on plan asset   Rp 984,000 Rp 822,000  
Minimum FSR required for non contribution to fund   105.00%    
Funding Sufficiency Ratio   105.00%    
Discount rate   7.25% 7.00% 6.50%
Rate of compensation increases   8.00% 8.00% 8.00%
The company | Series B shares | Funded pension        
Disclosure of defined benefit plans [line items]        
Equity instruments   Rp 336,000 Rp 409,000