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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Maturity (Details) - IDR (Rp)
Rp in Billions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Post-employment health care benefit cost    
Disclosure of defined benefit plans [line items]    
Weighted average duration of DBO 15 years 1 month 21 days 13 years 4 months 2 days
Post-employment health care benefit cost | Within next 10 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments Rp 5,649 Rp 6,064
Post-employment health care benefit cost | Within 10-20 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 6,778 8,001
Post-employment health care benefit cost | Within 20-30 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 5,575 7,501
Post-employment health care benefit cost | Within 30-40 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 2,479 4,123
Post-employment health care benefit cost | Within 40-50 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 398 958
Post-employment health care benefit cost | Within 50-60 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments Rp 6 42
Post-employment health care benefit cost | Within 60-70 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments   Rp 0
Other post-employment benefit cost    
Disclosure of defined benefit plans [line items]    
Weighted average duration of DBO 7 years 2 months 16 days 3 years 7 months 24 days
Other post-employment benefit cost | Within next 10 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments Rp 417 Rp 418
Other post-employment benefit cost | Within 10-20 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 102 68
Other post-employment benefit cost | Within 20-30 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 78 38
Other post-employment benefit cost | Within 30-40 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments Rp 4 Rp 3
Periodic pension benefit cost | Telkomsel    
Disclosure of defined benefit plans [line items]    
Weighted average duration of DBO 11 years 10 years 5 months 9 days
Periodic pension benefit cost | Telkomsel | Within next 10 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments Rp 3,795 Rp 3,486
Periodic pension benefit cost | Telkomsel | Within 10-20 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 10,620 9,420
Periodic pension benefit cost | Telkomsel | Within 20-30 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 8,203 7,150
Periodic pension benefit cost | Telkomsel | Within 30-40 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments Rp 1,035 Rp 1,267
The company | Defined pension benefit obligation    
Disclosure of defined benefit plans [line items]    
Weighted average duration of DBO 10 years 5 months 23 days 10 years 1 month 28 days
The company | Defined pension benefit obligation | Within next 10 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments Rp 18,913 Rp 18,392
The company | Defined pension benefit obligation | Within 10-20 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 21,775 21,855
The company | Defined pension benefit obligation | Within 20-30 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 19,869 20,154
The company | Defined pension benefit obligation | Within 30-40 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 14,599 15,351
The company | Defined pension benefit obligation | Within 40-50 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 3,278 4,265
The company | Defined pension benefit obligation | Within 50-60 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 378 468
The company | Defined pension benefit obligation | Within 60-70 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments Rp 23 32
The company | Defined pension benefit obligation | Within 70-80 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments   Rp 0
The company | Additional pension benefit obligation    
Disclosure of defined benefit plans [line items]    
Weighted average duration of DBO 10 years 5 months 23 days 10 years 1 month 28 days
The company | Unfunded Pension    
Disclosure of defined benefit plans [line items]    
Weighted average duration of DBO 5 years 9 months 4 days 4 years 8 months 9 days
The company | Unfunded Pension | Within next 10 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments Rp 1,061 Rp 1,587
The company | Unfunded Pension | Within 10-20 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 94 125
The company | Unfunded Pension | Within 20-30 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 77 52
The company | Unfunded Pension | Within 30-40 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments Rp 20 Rp 18