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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Unfunded Pension (Details) - The company - Unfunded Pension - IDR (Rp)
Rp in Billions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of defined benefit plans [line items]    
Employer's contribution Rp 44 Rp 41
Pre retirement employees inactiveness period 6 months  
Retirement age 56 years  
Pension benefit obligations at beginning of year Rp 962 1,479
Service costs 25 28
Interest income 49 89
Actuarial (gain) losses recognized in OCI (82) (89)
Benefits paid by employer (341) (545)
Pension benefit obligations at end of year Rp 613 Rp 962