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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, 2023
Dec. 31, 2022
Disclosure of defined benefit plans [line items]    
Pension benefit obligations at beginning of year Rp 8,509 Rp 9,717
Service costs 657 504
Interest income 595 607
Employer's contributions (1,639) (719)
Pension benefit obligations at end of year Rp 9,862 Rp 8,509