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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Health Care (Details) - IDR (Rp)
Rp in Billions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of net defined benefit liability (asset) [line items]    
Minimum employee working period for benefits 30 years  
Post-employment health care benefit cost    
Disclosure of net defined benefit liability (asset) [line items]    
Pension benefit obligations at beginning of year Rp 996 Rp 195
Return on plan assets (excluding amount included in net interest expense) (62) 271
Actuarial losses recognized in OCI (96) (905)
Pension benefit obligations at end of year Rp 1,407 996
Post-employment health care benefit cost | Employee hired before November 1, 1995    
Disclosure of net defined benefit liability (asset) [line items]    
Minimum employee working period for benefits 20 years  
Post-employment health care benefit cost | Present value of the defined benefit obligations    
Disclosure of net defined benefit liability (asset) [line items]    
Pension benefit obligations at beginning of year Rp 13,823 12,423
Interest income 1,083 1,062
Actuarial losses recognized in OCI 96 905
Benefits paid (559) (567)
Pension benefit obligations at end of year 14,443 13,823
Post-employment health care benefit cost | Plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
Pension benefit obligations at beginning of year (12,827) (12,228)
Interest income (1,004) (1,045)
Return on plan assets (excluding amount included in net interest expense) 62 (271)
Benefits paid 559 567
Plan administration costs (174) (150)
Pension benefit obligations at end of year Rp (13,036) Rp (12,827)