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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Other post-employment benefits cost - 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 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
Other post-employment benefit cost        
Disclosure of defined benefit plans [line items]        
Service costs   4 6 6
Net interest cost   29 26 36
Net periodic pension benefit cost   33 32 42
Experience adjustments   (25) 40 10
Changes in demographic assumptions   20 (34)  
Changes in financial assumptions   20 (30) 30
Defined benefit plan actuarial gain (loss) - net of tax   Rp 15 Rp (24) Rp 40
Discount rate 6.25% 6.25% 8.00% 5.75%