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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of defined benefit plans [line items]      
Net defined benefit liability (asset) Rp 9,862 Rp 8,509 Rp 9,717
Net periodic pension benefit cost 1,764 1,585 1,680
Defined benefit plan acturial gain (loss) - net of tax (1,412) 1,612 2,168
Obligation under the Labor Law      
Disclosure of defined benefit plans [line items]      
Net defined benefit liability (asset) 1,005 928  
Net periodic pension benefit cost 217 78 254
Defined benefit plan acturial gain (loss) - net of tax Rp 41 Rp 13 Rp 42