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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Health Care - Movements of Projected Benefit Obligation (Details) - Post-employment health care benefit cost - IDR (Rp)
Rp in Billions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of net defined benefit liability (asset) [line items]    
Pension benefit obligations at beginning of year Rp 1,592 Rp 118
Net periodic post-employment health care benefit costs 276 165
Actuarial gain (losses) recognized in OCI 1,460 1,828
Return on plan assets (excluding amount included in net interest expense) (909) (519)
Pension benefit obligations at end of year Rp 2,419 Rp 1,592