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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Telkomsel (Details) - Telkomsel - Pension benefit cost - IDR (Rp)
Rp in Billions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2004
Disclosure of net defined benefit liability (asset) [line items]      
Pension benefit obligations at beginning of year Rp (1,193) Rp (803)  
Actuarial gain (losses) recognized in OCI (584) (392)  
Return on plan assets (excluding amount included in net interest expense) (54) (100)  
Benefits paid by employer (131) (83)  
Funded status (1,839) (1,193)  
Pension benefit obligations at end of year (1,839) (1,193)  
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 2,034 1,415  
Service costs 149 107  
Net interest income (costs) 167 130  
Actuarial gain (losses) recognized in OCI 584 392  
Benefits paid (6) (10)  
Pension benefit obligations at end of year 2,928 2,034  
Plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Pension benefit obligations at beginning of year (841) (612)  
Net interest income (costs) 69 56  
Return on plan assets (excluding amount included in net interest expense) 54 100  
Benefits paid by employer 131 83  
Benefits paid 6 10  
Pension benefit obligations at end of year Rp (1,089) Rp (841)