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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Maturity (Details) - IDR (Rp)
Rp in Billions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Post-employment health care benefit cost    
Disclosure of defined benefit plans [line items]    
Weighted average duration of DBO 13 years 4 months 2 days 17 years 4 months 28 days
Post-employment health care benefit cost | Within next 10 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments Rp 6,064 Rp 5,620
Post-employment health care benefit cost | Within 10-20 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 8,001 6,913
Post-employment health care benefit cost | Within 20-30 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 7,501 6,217
Post-employment health care benefit cost | Within 30-40 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 4,123 3,193
Post-employment health care benefit cost | Within 40-50 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 958 661
Post-employment health care benefit cost | Within 50-60 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments Rp 42 22
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 3 years 7 months 24 days 3 years 1 month 17 days
Other post-employment benefit cost | Within next 10 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments Rp 418 Rp 485
Other post-employment benefit cost | Within 10-20 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 68 91
Other post-employment benefit cost | Within 20-30 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 38 39
Other post-employment benefit cost | Within 30-40 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments Rp 3 Rp 3
Pension benefit cost | Telkomsel    
Disclosure of defined benefit plans [line items]    
Weighted average duration of DBO 10 years 5 months 9 days 10 years 6 months 29 days
Pension benefit cost | Telkomsel | Within next 10 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments Rp 3,486 Rp 2,498
Pension benefit cost | Telkomsel | Within 10-20 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 9,420 7,880
Pension benefit cost | Telkomsel | Within 20-30 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 7,150 6,680
Pension benefit cost | Telkomsel | Within 30-40 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments Rp 1,267 Rp 1,580
The company | Defined pension benefit obligation    
Disclosure of defined benefit plans [line items]    
Weighted average duration of DBO 10 years 1 month 28 days 9 years 1 month 10 days
The company | Defined pension benefit obligation | Within next 10 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments Rp 18,392 Rp 16,370
The company | Defined pension benefit obligation | Within 10-20 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 21,855 20,349
The company | Defined pension benefit obligation | Within 20-30 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 20,154 16,207
The company | Defined pension benefit obligation | Within 30-40 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 15,351 9,400
The company | Defined pension benefit obligation | Within 40-50 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 4,265 3,383
The company | Defined pension benefit obligation | Within 50-60 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 468 644
The company | Defined pension benefit obligation | Within 60-70 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments Rp 32 62
The company | Defined pension benefit obligation | Within 70-80 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments   Rp 2
The company | Additional pension benefit obligation    
Disclosure of defined benefit plans [line items]    
Weighted average duration of DBO 10 years 1 month 28 days 9 years 1 month 10 days
The company | Additional pension benefit obligation | Within 20-30 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments   Rp 20
The company | Additional pension benefit obligation | Within 30-40 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments   38
The company | Additional pension benefit obligation | Within 40-50 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments   30
The company | Additional pension benefit obligation | Within 50-60 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments   50
The company | Additional pension benefit obligation | Within 60-70 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments   Rp 101
The company | Unfunded Pension    
Disclosure of defined benefit plans [line items]    
Weighted average duration of DBO 4 years 8 months 9 days 3 years 11 months 19 days
The company | Unfunded Pension | Within next 10 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments Rp 1,587 Rp 948
The company | Unfunded Pension | Within 10-20 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 125 160
The company | Unfunded Pension | Within 20-30 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments 52 29
The company | Unfunded Pension | Within 30-40 years    
Disclosure of defined benefit plans [line items]    
Estimated future benefit payments Rp 18 Rp 9