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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Obligation under the Labor Law (Details) - IDR (Rp)
Rp in Billions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of defined benefit plans [line items]      
Post-employment benefit expense, defined benefit plans Rp 1,449 Rp 1,176 Rp 1,600
Amount recognised in other comprehensive income before tax adjustment (4,455) (2,520) 5,418
Obligation under the Labor Law      
Disclosure of defined benefit plans [line items]      
Net defined benefit liability (asset) 777 690  
Post-employment benefit expense, defined benefit plans 258 136 113
Amount recognised in other comprehensive income before tax adjustment Rp 125 Rp (107) Rp 14