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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Health Care - Movements of Projected Benefit Obligation (Details) - Post-employment health care benefit cost - IDR (Rp)
Rp in Billions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of net defined benefit liability (asset) [line items]    
Pension benefit obligations at beginning of year Rp 996 Rp 195
Net periodic post-employment health care benefit costs 253 167
Actuarial losses recognised in OCI 96 905
Return on plan assets (excluding amount included in net interest expense) 62 (271)
Pension benefit obligations at end of year Rp 1,407 Rp 996