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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Health Care - Components (Details)
$ in Millions, Rp in Billions
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
IDR (Rp)
Dec. 31, 2017
IDR (Rp)
Dec. 31, 2016
IDR (Rp)
Disclosure of net defined benefit liability (asset) [line items]        
Net periodic pension benefit cost   Rp 1,600 Rp 2,080 Rp 1,361
Defined benefit plan actuarial gain (loss) - net of tax $ (335) (4,820) 2,375 2,058
Post-employment health care benefit cost        
Disclosure of net defined benefit liability (asset) [line items]        
Service costs       9
Plan administration cost   160 140 144
Net interest cost   175 136 12
Net periodic pension benefit cost   335 276 165
Amount charged to subsidiaries under contractual agreements       (2)
Net periodic pension benefit cost   335 276 163
Experience adjustments   (1,100) (1,198) 26
Changes in demographic assumptions       66
Changes in financial assumptions   (2,541) 2,658 1,736
Return on plan assets (excluding amount included in net interest expense)   1,082 (909) (519)
Defined benefit plan actuarial gain (loss) - net of tax   Rp (2,559) Rp 551 Rp 1,309