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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, 2020
USD ($)
Dec. 31, 2020
IDR (Rp)
Dec. 31, 2019
IDR (Rp)
Dec. 31, 2018
IDR (Rp)
Disclosure of defined benefit plans [line items]        
Net periodic pension benefit cost   Rp 1,449 Rp 1,176 Rp 1,600
Defined benefit plan actuarial gain (loss) - net of tax $ 256 3,596 2,109 (4,820)
Periodic pension benefit cost        
Disclosure of defined benefit plans [line items]        
Net periodic pension benefit cost   804 840 1,120
The company | Funded pension        
Disclosure of defined benefit plans [line items]        
Service costs   260 259 384
Plan administration cost   61 63 62
Net interest cost   161 76 102
Additional welfare benefits   80    
Net periodic pension benefit cost   562 398 548
Amount charged to subsidiaries under contractual agreements   (17) (36) (37)
Net periodic pension benefit cost   545 362 511
Experience adjustments   356 (677) 329
Changes in financial assumptions   2,190 1,952 (3,020)
Changes in demographic assumptions   195 239  
Return on plan assets (excluding amount included in net interest expense)   201 (398) 1,455
Defined benefit plan actuarial gain (loss) - net of tax   Rp 2,942 Rp 1,116 Rp (1,236)
Discount rate 6.50% 6.50% 7.25% 8.25%
Rate of compensation increases 8.00% 8.00% 8.00% 8.00%