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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Maturity (Details) - IDR (Rp)
Rp in Billions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Post-employment health care benefit cost    
Disclosure of defined benefit plans [line items]    
Weighted average duration of DBO 13 years 4 months 20 days 12 years 4 months 20 days
Post-employment health care benefit cost | Within next 10 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments Rp 8,153 Rp 8,929
Post-employment health care benefit cost | Within 10-20 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 13,311 13,651
Post-employment health care benefit cost | Within 20-30 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 13,927 12,128
Post-employment health care benefit cost | Within 30-40 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 7,896 5,114
Post-employment health care benefit cost | Within 40-50 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 2,142 819
Post-employment health care benefit cost | Within 50-60 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 340 48
Post-employment health care benefit cost | Within 60-70 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 62 5
Post-employment health care benefit cost | Within 70-80 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments Rp 7 Rp 1
Other post-employment benefit cost    
Disclosure of defined benefit plans [line items]    
Weighted average duration of DBO 5 years 2 months 4 days 4 years 6 months 3 days
Other post-employment benefit cost | Within next 10 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments Rp 202 Rp 281
Other post-employment benefit cost | Within 10-20 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 118 116
Other post-employment benefit cost | Within 20-30 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 66 70
Other post-employment benefit cost | Within 30-40 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments Rp 2 Rp 3
Post-employment benefits UUCK (Telkom)    
Disclosure of defined benefit plans [line items]    
Weighted average duration of DBO 10 years 8 months 15 days 11 years 2 months 4 days
Post-employment benefits UUCK (Telkom) | Within next 10 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments Rp 118 Rp 83
Post-employment benefits UUCK (Telkom) | Within 10-20 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 488 426
Post-employment benefits UUCK (Telkom) | Within 20-30 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 610 485
Post-employment benefits UUCK (Telkom) | Within 30-40 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 41 Rp 49
Periodic pension benefit cost | Telkomsel    
Disclosure of defined benefit plans [line items]    
Weighted average duration of DBO   9 years 2 months 4 days
Periodic pension benefit cost | Telkomsel | Within next 10 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 9,404 Rp 8,833
Periodic pension benefit cost | Telkomsel | Within 10-20 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 13,131 13,778
Periodic pension benefit cost | Telkomsel | Within 20-30 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 8,449 9,184
Periodic pension benefit cost | Telkomsel | Within 30-40 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments Rp 410 Rp 439
The company | Telkomsel    
Disclosure of defined benefit plans [line items]    
Weighted average duration of DBO 8 years 5 months 26 days  
The company | Defined pension benefit obligation    
Disclosure of defined benefit plans [line items]    
Weighted average duration of DBO 8 years 1 month 28 days 8 years 5 months 1 day
The company | Defined pension benefit obligation | Within next 10 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments Rp 20,107 Rp 21,044
The company | Defined pension benefit obligation | Within 10-20 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 15,035 15,850
The company | Defined pension benefit obligation | Within 20-30 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 8,744 9,623
The company | Defined pension benefit obligation | Within 30-40 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 3,079 3,630
The company | Defined pension benefit obligation | Within 40-50 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 539 693
The company | Defined pension benefit obligation | Within 50-60 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 37 53
The company | Defined pension benefit obligation | Within 60-70 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments Rp 1 Rp 1
The company | Additional pension benefit obligation    
Disclosure of defined benefit plans [line items]    
Weighted average duration of DBO 8 years 1 month 28 days 8 years 5 months 1 day
The company | Additional pension benefit obligation | Within next 10 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments Rp 39 Rp 39
The company | Additional pension benefit obligation | Within 10-20 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 28 30
The company | Additional pension benefit obligation | Within 20-30 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 15 16
The company | Additional pension benefit obligation | Within 30-40 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 5 5
The company | Additional pension benefit obligation | Within 40-50 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments Rp 1 Rp 1
The company | Unfunded Pension    
Disclosure of defined benefit plans [line items]    
Weighted average duration of DBO 6 years 5 months 23 days 5 years 6 months 14 days
The company | Unfunded Pension | Within next 10 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments Rp 277 Rp 340
The company | Unfunded Pension | Within 10-20 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 110 79
The company | Unfunded Pension | Within 20-30 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 212 139
The company | Unfunded Pension | Within 30-40 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments Rp 20 Rp 21