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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Other post-employment benefits cost (Details) - Other post-employment benefit cost - IDR (Rp)
Rp in Billions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of defined benefit plans [line items]    
Pension benefit obligations at beginning of year Rp 367 Rp 366
Service costs 7 4
Interest income 16 19
Past service costs   58
Actuarial (gain) losses recognized in OCI (2) 15
Benefits paid by employer (88) (95)
Pension benefit obligations at end of year Rp 300 Rp 367