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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Long service employee benefit (Details) - IDR (Rp)
Rp in Billions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of defined benefit plans [line items]    
Long service employee benefit obligation Rp 3 Rp 53
Long Term Service Employee Benefit [Member]    
Disclosure of defined benefit plans [line items]    
Minimum employee working period for benefits 30 years  
Total obligation Rp 4 53
Long service employee benefit obligation Rp 3 Rp 53