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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Components of net periodic pension benefit cost (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 defined benefit plans [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
Pension benefit cost        
Disclosure of defined benefit plans [line items]        
Net periodic pension benefit cost   1,120 1,700 1,068
The company | Funded pension        
Disclosure of defined benefit plans [line items]        
Service costs   384 366 363
Past service cost - plan amendments     94 245
Plan administration cost   62 57 46
Net interest cost   102 66 (14)
Net periodic pension benefit cost   548 583 640
Amount charged to subsidiaries under contractual agreements   (37) (26) (32)
Net periodic pension benefit cost   511 557 608
Experience adjustments   329 163 70
Changes in demographic assumptions       140
Changes in financial assumptions   (3,020) 2,699 1,470
Return on plan assets (excluding amount included in net interest expense)   1,455 (1,708) (1,188)
Defined benefit plan actuarial gain (loss) - net of tax   Rp (1,236) Rp 1,154 Rp 492
Discount rate 8.25% 8.25% 6.75% 8.00%
Rate of compensation increases 8.00% 8.00% 8.00% 8.00%