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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of defined benefit plans [line items]      
Net defined benefit liability (asset) Rp 8,509 Rp 9,717 Rp 10,816
Post-employment benefit expense, defined benefit plans 1,585 1,680 1,449
Amount recognised in other comprehensive income before tax adjustment 1,612 2,168 (4,455)
Obligation under the Labor Law      
Disclosure of defined benefit plans [line items]      
Net defined benefit liability (asset) 928 926  
Post-employment benefit expense, defined benefit plans 78 254 258
Amount recognised in other comprehensive income before tax adjustment Rp 13 Rp 42 Rp 125