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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Health Care - Components (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 net defined benefit liability (asset) [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
Post-employment health care benefit cost        
Disclosure of net defined benefit liability (asset) [line items]        
Plan administration cost   150 160 140
Net interest cost   17 175 136
Net periodic pension benefit cost   167 335 276
Net periodic pension benefit cost   167 335 276
Experience adjustments   810 (1,100) (1,198)
Changes in financial assumptions   1,190 (2,541) 2,658
Changes in demographic assumptions   (1,095)    
Return on plan assets (excluding amount included in net interest expense)   (271) 1,082 (909)
Defined benefit plan actuarial gain (loss) - net of tax   Rp 634 Rp (2,559) Rp 551