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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Telkomsel - Movements of pension benefit obligation (Details) - IDR (Rp)
Rp in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of defined benefit plans [line items]    
Pension benefit obligations at beginning of year Rp 8,509,000 Rp 9,717,000
Return on plan assets (excluding amount included in net interest expense) (537,000) 82,000
Employer's contributions (1,635,000) (719,000)
Benefits paid (149,000) (291,000)
Pension benefit obligations at end of year 9,862,000 Rp 8,509,000
Telkomsel    
Disclosure of defined benefit plans [line items]    
Pension benefit obligations at end of year Rp 20,500