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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Other post-employment benefits cost (Details) - IDR (Rp)
Rp in Billions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of defined benefit plans [line items]    
Pension benefit obligations at beginning of year Rp 9,717 Rp 10,816
Service costs 504 353
Interest income 607 696
Employer's contributions (719) (226)
Pension benefit obligations at end of year Rp 8,509 Rp 9,717