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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Schedule of changes in projected pension benefit obligations and plan assets (Details) - IDR (Rp)
Rp in Billions
 12 Months Ended
Apr. 23, 2021
Dec. 31, 2022
Dec. 31, 2021
PENSION AND OTHER POST-EMPLOYMENT BENEFITS      
Pension benefit obligations at beginning of year   Rp 9,717 Rp 10,816
Service costs   504 353
Interest costs and interest income from assets   607 696
Plan administration cost   227 228
Additional welfare benefits   65 80
Cost recognized in the consolidated statement of profit or loss   1,403 1,357
Actuarial (gain) loss on:      
Experience adjustments   (1,468) (121)
Changes in demographic assumptions   (1) (1,122)
Changes in financial assumptions   (233) (1,522)
Return on plan assets (excluding amount included in net interest expense)   82 720
Changes in asset ceiling excluding amount in net interest   84  
Net   (1,536) (2,045)
Employer's contributions   (719) (226)
Benefits paid   (291)  
Benefits paid by employer   (65) (185)
Pension benefit obligations at end of year   8,509 9,717
Projected pension benefit obligation at end of year   8,509 9,717
Telkomsel      
Actuarial (gain) loss on:      
Employer's contributions Rp (857)    
Pension plan participants' contributions Rp 73    
Pension benefit obligations at end of year   853  
Benefit plan obligations | Defined pension benefit plan | Telkomsel | Funded      
PENSION AND OTHER POST-EMPLOYMENT BENEFITS      
Pension benefit obligations at beginning of year   5,020 4,651
Service costs   326 84
Interest costs and interest income from assets   328 299
Cost recognized in the consolidated statement of profit or loss   654 383
Actuarial (gain) loss on:      
Experience adjustments   (1) 324
Changes in demographic assumptions   (1)  
Changes in financial assumptions   (67) (233)
Return on plan assets (excluding amount included in net interest expense)   (186)  
Net   (255) 91
Benefits paid   (291)  
Benefits paid by employer     (105)
Pension benefit obligations at end of year   5,128 5,020
Projected pension benefit obligation at end of year   4,275 4,188
Benefit plan obligations | Defined pension benefit plan | The company | Funded      
PENSION AND OTHER POST-EMPLOYMENT BENEFITS      
Pension benefit obligations at beginning of year   23,838 25,103
Service costs   178 269
Interest costs and interest income from assets   1,635 1,577
Additional welfare benefits   65 80
Cost recognized in the consolidated statement of profit or loss   1,878 1,926
Actuarial (gain) loss on:      
Experience adjustments   (737) (340)
Changes in demographic assumptions     (1,122)
Changes in financial assumptions   (30)  
Net   (767) (1,462)
Pension plan participants' contributions   19 21
Benefits paid   (1,767) (1,670)
Benefits paid by employer   (65) (80)
Pension benefit obligations at end of year   23,136 23,838
Projected pension benefit obligation at end of year   4,234 4,891
Benefit plan obligations | Post-employment health care benefit cost | The company      
PENSION AND OTHER POST-EMPLOYMENT BENEFITS      
Pension benefit obligations at beginning of year   13,416 14,443
Interest costs and interest income from assets   982 955
Cost recognized in the consolidated statement of profit or loss   982 955
Actuarial (gain) loss on:      
Experience adjustments   (730) (105)
Changes in financial assumptions   (136) (1,289)
Net   (866) (1,394)
Benefits paid     (588)
Benefits paid by employer   (654)  
Pension benefit obligations at end of year   12,878 13,416
Projected pension benefit obligation at end of year     638
Benefit plan assets | Defined pension benefit plan | Telkomsel | Funded      
PENSION AND OTHER POST-EMPLOYMENT BENEFITS      
Pension benefit obligations at beginning of year   (832) (799)
Interest costs and interest income from assets   (58) (52)
Cost recognized in the consolidated statement of profit or loss   (58) (52)
Actuarial (gain) loss on:      
Return on plan assets (excluding amount included in net interest expense)   37 19
Net   37 19
Pension benefit obligations at end of year   (853) (832)
Benefit plan assets | Defined pension benefit plan | The company | Funded      
PENSION AND OTHER POST-EMPLOYMENT BENEFITS      
Pension benefit obligations at beginning of year   (18,947) (19,546)
Interest costs and interest income from assets   (1,347) (1,223)
Plan administration cost   63 60
Cost recognized in the consolidated statement of profit or loss   (1,284) (1,163)
Actuarial (gain) loss on:      
Return on plan assets (excluding amount included in net interest expense)   300 339
Net   300 339
Employer's contributions   (719) (226)
Pension plan participants' contributions   (19) (21)
Benefits paid   1,767 1,670
Pension benefit obligations at end of year   (18,902) (18,947)
Benefit plan assets | Post-employment health care benefit cost | The company      
PENSION AND OTHER POST-EMPLOYMENT BENEFITS      
Pension benefit obligations at beginning of year   (12,778) (13,036)
Interest costs and interest income from assets   (933) (860)
Plan administration cost   164 168
Cost recognized in the consolidated statement of profit or loss   (769) (692)
Actuarial (gain) loss on:      
Return on plan assets (excluding amount included in net interest expense)   (69) 362
Changes in asset ceiling excluding amount in net interest   84  
Net   15 362
Benefits paid     588
Benefits paid by employer   654  
Pension benefit obligations at end of year   Rp (12,878) Rp (12,778)