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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Telkomsel (Details) - Telkomsel - IDR (Rp)
Rp in Billions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2004
Disclosure of net defined benefit liability (asset) [line items]      
New plan established from insured benefits Rp 799    
Employer contributions 53 Rp 207  
Benefits paid by employer (53) (207)  
Periodic pension benefit cost      
Disclosure of net defined benefit liability (asset) [line items]      
Pension benefit obligations at beginning of year 2,209 1,541  
Actuarial losses recognized in OCI (1,585) (614)  
Return on plan assets (excluding amount included in net interest expense) 31 53  
Pension benefit obligations at end of year 3,852 2,209  
Periodic pension benefit cost | Until 2004      
Disclosure of net defined benefit liability (asset) [line items]      
Percentage of participating employees contribution     5.00%
Periodic pension benefit cost | Present value of the defined benefit obligations      
Disclosure of net defined benefit liability (asset) [line items]      
Pension benefit obligations at beginning of year 3,738 2,734  
Service costs 245 187  
Interest income 278 224  
Actuarial losses recognized in OCI 1,585 614  
Benefits paid (50) (21)  
Final service costs (1,145)    
Pension benefit obligations at end of year 4,651 3,738  
Periodic pension benefit cost | Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Employer contributions 53 207  
Pension benefit obligations at beginning of year 1,529 1,193  
Interest income (104) (97)  
Return on plan assets (excluding amount included in net interest expense) 31 53  
Benefits paid by employer (53) (207)  
Benefits paid (50) (21)  
Settlement loss (868)    
Pension benefit obligations at end of year Rp 799 Rp 1,529