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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Health Care - Components (Details)
$ in Millions, Rp in Billions
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
IDR (Rp)
Dec. 31, 2016
IDR (Rp)
Dec. 31, 2015
IDR (Rp)
Disclosure of net defined benefit liability (asset) [line items]        
Net periodic pension benefit cost   Rp 2,080 Rp 1,361 Rp 759
Defined benefit plan actuarial gain (loss) - net of tax $ 175 2,375 2,058 (368)
Post-employment health care benefit cost        
Disclosure of net defined benefit liability (asset) [line items]        
Service costs     9 49
Plan administration cost   140 144 131
Net interest cost   136 12 37
Net periodic pension benefit cost   276 165 217
Amount charged to subsidiaries under contractual agreements     (2) (1)
Net periodic pension benefit cost   276 163 216
Experience adjustments   (1,198) 26 (53)
Changes in demographic assumptions     66 92
Changes in financial assumptions   2,658 1,736 (1,226)
Return on plan assets (excluding amount included in net interest expense)   (909) (519) 647
Defined benefit plan actuarial gain (loss) - net of tax   Rp 551 Rp 1,309 Rp (540)