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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Maturity (Details) - IDR (Rp)
Rp in Billions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Post-employment health care benefit cost    
Disclosure of defined benefit plans [line items]    
Weighted average duration of DBO 14 years 1 month 17 days 15 years 1 month 20 days
Post-employment health care benefit cost | Within next 10 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments Rp 5,959 Rp 5,649
Post-employment health care benefit cost | Within 10-20 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 6,697 6,778
Post-employment health care benefit cost | Within 20-30 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 5,117 5,575
Post-employment health care benefit cost | Within 30-40 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 2,025 2,479
Post-employment health care benefit cost | Within 40-50 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 259 398
Post-employment health care benefit cost | Within 50-60 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments Rp 1 Rp 6
Other post-employment benefit cost    
Disclosure of defined benefit plans [line items]    
Weighted average duration of DBO 4 years 10 months 17 days 7 years 2 months 15 days
Other post-employment benefit cost | Within next 10 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments Rp 357 Rp 417
Other post-employment benefit cost | Within 10-20 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 121 102
Other post-employment benefit cost | Within 20-30 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 92 78
Other post-employment benefit cost | Within 30-40 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 5 Rp 4
Periodic pension benefit cost | Telkomsel    
Disclosure of defined benefit plans [line items]    
Weighted average duration of DBO   11 years
Periodic pension benefit cost | Telkomsel | Within next 10 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 4,224 Rp 3,795
Periodic pension benefit cost | Telkomsel | Within 10-20 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 10,849 10,620
Periodic pension benefit cost | Telkomsel | Within 20-30 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 8,385 8,203
Periodic pension benefit cost | Telkomsel | Within 30-40 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments Rp 901 Rp 1,035
The company | Telkomsel    
Disclosure of defined benefit plans [line items]    
Weighted average duration of DBO 10 years 3 months 18 days  
The company | Defined pension benefit obligation    
Disclosure of defined benefit plans [line items]    
Weighted average duration of DBO 10 years 6 months 10 years 5 months 23 days
The company | Defined pension benefit obligation | Within next 10 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments Rp 20,809 Rp 18,913
The company | Defined pension benefit obligation | Within 10-20 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 23,096 21,775
The company | Defined pension benefit obligation | Within 20-30 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 21,308 19,869
The company | Defined pension benefit obligation | Within 30-40 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 16,537 14,599
The company | Defined pension benefit obligation | Within 40-50 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 3,965 3,278
The company | Defined pension benefit obligation | Within 50-60 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 2,803 378
The company | Defined pension benefit obligation | Within 60-70 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments Rp 16 Rp 23
The company | Additional pension benefit obligation    
Disclosure of defined benefit plans [line items]    
Weighted average duration of DBO 10 years 6 months 10 years 5 months 23 days
The company | Unfunded Pension    
Disclosure of defined benefit plans [line items]    
Weighted average duration of DBO 5 years 9 months 5 years 9 months 3 days
The company | Unfunded Pension | Within next 10 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments Rp 691 Rp 1,061
The company | Unfunded Pension | Within 10-20 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 92 94
The company | Unfunded Pension | Within 20-30 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 85 77
The company | Unfunded Pension | Within 30-40 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments Rp 17 Rp 20