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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, 2019
USD ($)
Dec. 31, 2019
IDR (Rp)
Dec. 31, 2018
IDR (Rp)
Dec. 31, 2017
IDR (Rp)
Disclosure of defined benefit plans [line items]        
Net periodic pension benefit cost   Rp 1,176 Rp 1,600 Rp 2,080
Defined benefit plan actuarial gain (loss) - net of tax $ 152 2,109 (4,820) 2,375
Pension benefit cost        
Disclosure of defined benefit plans [line items]        
Net periodic pension benefit cost   840 1,120 1,700
The company | Funded pension        
Disclosure of defined benefit plans [line items]        
Service costs   259 384 366
Past service cost - plan amendments       94
Plan administration cost   63 62 57
Net interest cost   76 102 66
Net periodic pension benefit cost   398 548 583
Amount charged to subsidiaries under contractual agreements   (36) (37) (26)
Net periodic pension benefit cost   362 511 557
Experience adjustments   (677) 329 163
Changes in financial assumptions   1,952 (3,020) 2,699
Changes in demographic assumptions   239    
Return on plan assets (excluding amount included in net interest expense)   (398) 1,455 (1,708)
Defined benefit plan actuarial gain (loss) - net of tax   Rp 1,116 Rp (1,236) Rp 1,154
Discount rate 7.25% 7.25% 8.25% 6.75%
Rate of compensation increases 8.00% 8.00% 8.00% 8.00%