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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Telkomsel (Details) - Pension benefit cost - Telkomsel - IDR (Rp)
Rp in Billions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2004
Disclosure of net defined benefit liability (asset) [line items]      
Pension benefit obligations at beginning of year Rp (1,839) Rp (1,193)  
Actuarial gain (losses) recognised in OCI 583 (584)  
Return on plan assets (excluding amount included in net interest expense) 68 (54)  
Benefits paid by employer (125) (131)  
Pension benefit obligations at end of year (1,541) (1,839)  
Until 2004      
Disclosure of net defined benefit liability (asset) [line items]      
Percentage of participating employees contribution     5.00%
Present value of the defined benefit obligations      
Disclosure of net defined benefit liability (asset) [line items]      
Pension benefit obligations at beginning of year 2,928 2,034  
Service costs 213 149  
Net interest income (costs) 203 167  
Actuarial gain (losses) recognised in OCI (583) 584  
Benefits paid (27) (6)  
Pension benefit obligations at end of year 2,734 2,928  
Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Pension benefit obligations at beginning of year (1,089) (841)  
Net interest income (costs) 74 69  
Return on plan assets (excluding amount included in net interest expense) (68) 54  
Benefits paid by employer 125 131  
Benefits paid 27 6  
Pension benefit obligations at end of year Rp (1,193) Rp (1,089)