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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Pension benefit cost (Details) - IDR (Rp)
Rp in Billions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Mar. 01, 2003
Feb. 28, 2003
Disclosure of net defined benefit liability (asset) [line items]        
Employer's contributions Rp 226 Rp 205    
Funded pension | The company        
Disclosure of net defined benefit liability (asset) [line items]        
Percentage of participating employees contribution     18.00% 8.40%
Pension benefit obligations at beginning of year (5,557)      
Return on plan assets (excluding amount included in net interest expense) 339 201    
Employer's contributions 226 205    
Additional welfare benefits 80 80    
Benefits paid by employer (80) (80)    
Pension benefit obligations at end of year (4,891) (5,557)    
Funded pension | Present value of the defined benefit obligations | The company        
Disclosure of net defined benefit liability (asset) [line items]        
Pension benefit obligations at beginning of year 25,103 22,061    
Service costs 269 260    
Interest income 1,577 1,544    
Pension plan participants' contributions 21 27    
Actuarial losses recognized in OCI (1,462) 2,741    
Pension benefits paid (1,670) (1,530)    
Additional welfare benefits 80 80    
Benefits paid by employer (80) (80)    
Pension benefit obligations at end of year 23,838 25,103    
Funded pension | Plan assets | The company        
Disclosure of net defined benefit liability (asset) [line items]        
Pension benefit obligations at beginning of year (19,546) (19,723)    
Interest income (1,223) (1,383)    
Return on plan assets (excluding amount included in net interest expense) (339) (201)    
Employer's contributions 226 205    
Pension plan participants' contributions (21) (27)    
Pension benefits paid (1,670) (1,530)    
Plan administration costs (60) (61)    
Pension benefit obligations at end of year Rp (18,947) Rp (19,546)