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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Health Care - Components (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 net defined benefit liability (asset) [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)
Post-employment health care benefit cost        
Disclosure of net defined benefit liability (asset) [line items]        
Plan administration cost   174 150 160
Net interest cost   79 17 175
Net periodic pension benefit cost   253 167 335
Net periodic pension benefit cost   253 167 335
Experience adjustments   (1,680) 810 (1,100)
Changes in financial assumptions   1,800 1,190 (2,541)
Changes in demographic assumptions   (24) (1,095)  
Return on plan assets (excluding amount included in net interest expense)   62 (271) 1,082
Defined benefit plan actuarial gain (loss) - net of tax   Rp 158 Rp 634 Rp (2,559)