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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Pension benefit cost (Details) - Funded pension - The company - IDR (Rp)
Rp in Billions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Mar. 01, 2003
Feb. 28, 2003
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 Rp 1,540      
Return on plan assets (excluding amount included in net interest expense) 1,455 Rp (1,708)    
Provision of additional benefit (205)      
Pension benefit obligations at end of year 1,057 1,540    
Present value of the defined benefit obligations        
Disclosure of net defined benefit liability (asset) [line items]        
Pension benefit obligations at beginning of year 22,354 18,849    
Service costs 384 366    
Past service cost - plan amendments   94    
Interest costs 1,459 1,454    
Pension plan participants’ contributions (38) (41)    
Actuarial losses recognized in OCI (2,691) 2,862    
Pension benefits paid (1,423) (1,312)    
Pension benefit obligations at end of year 20,121 22,354    
Plan assets        
Disclosure of net defined benefit liability (asset) [line items]        
Pension benefit obligations at beginning of year (20,814) (19,046)    
Interest costs (1,357) (1,388)    
Return on plan assets (excluding amount included in net interest expense) (1,455) 1,708    
Pension plan participants’ contributions 38 41    
Pension benefits paid 1,423 1,312    
Provision of additional benefit (205)      
Plan administration costs (62) (57)    
Pension benefit obligations at end of year Rp (19,064) Rp (20,814)