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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Telkomsel - Movements of pension benefit obligation (Details)
Rp in Billions
12 Months Ended
Jun. 07, 2017
Dec. 31, 2019
IDR (Rp)
Dec. 31, 2018
IDR (Rp)
Disclosure of defined benefit plans [line items]      
Maximum percentage of surplus defined benefit plan 10    
Threshold FSR 105    
Telkomsel      
Disclosure of defined benefit plans [line items]      
Benefits paid by employer   Rp (207) Rp (125)
Pension benefit cost | Telkomsel      
Disclosure of defined benefit plans [line items]      
Pension benefit obligations at beginning of year   1,541 1,839
Periodic pension benefit cost   (314) (342)
Actuarial (gain) losses recognised in OCI   614 (583)
Return on plan assets (excluding amount included in net interest expense)   (53) 68
Benefits paid by employer   (207) (125)
Pension benefit obligations at end of year   Rp 2,209 Rp 1,541