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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Health Care (Details) - Post-employment health care benefit cost - IDR (Rp)
Rp in Billions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of net defined benefit liability (asset) [line items]    
Pension benefit obligations at beginning of year Rp 1,407 Rp 996
Return on plan assets (excluding amount included in net interest expense) (362) (62)
Actuarial (gain) losses recognized in OCI 1,394 (96)
Pension benefit obligations at end of year Rp 638 1,407
Employee hired before November 1, 1995    
Disclosure of net defined benefit liability (asset) [line items]    
Minimum employee working period for benefits 20 years  
Present value of the defined benefit obligations    
Disclosure of net defined benefit liability (asset) [line items]    
Pension benefit obligations at beginning of year Rp 14,443 13,823
Interest income 955 1,083
Actuarial (gain) losses recognized in OCI (1,394) 96
Benefits paid (588) (559)
Pension benefit obligations at end of year 13,416 14,443
Plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
Pension benefit obligations at beginning of year (13,036) (12,827)
Interest income (860) (1,004)
Return on plan assets (excluding amount included in net interest expense) 362 62
Benefits paid 588 559
Plan administration costs (168) (174)
Pension benefit obligations at end of year Rp (12,778) Rp (13,036)