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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, 2019
Dec. 31, 2018
Disclosure of net defined benefit liability (asset) [line items]    
Pension benefit obligations at beginning of year Rp 195 Rp 2,419
Return on plan assets (excluding amount included in net interest expense) 271 (1,082)
Actuarial (gain) losses recognized in OCI (905) 3,641
Pension benefit obligations at end of year Rp 996 195
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 12,423 15,448
Interest income 1,062 1,102
Actuarial (gain) losses recognized in OCI 905 (3,641)
Benefits paid (567) (486)
Pension benefit obligations at end of year 13,823 12,423
Plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
Pension benefit obligations at beginning of year (12,228) (13,029)
Interest income (1,045) (927)
Return on plan assets (excluding amount included in net interest expense) (271) 1,082
Benefits paid 567 486
Plan administration costs (150) (160)
Pension benefit obligations at end of year Rp (12,827) Rp (12,228)