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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Maturity (Details)
Rp in Billions
 12 Months Ended
Dec. 31, 2018
IDR (Rp)
Y
Post-employment health care benefit cost  
Disclosure of defined benefit plans [line items]  
Weighted average duration of DBO | Y 17.41
Post-employment health care benefit cost | Within next 10 years  
Disclosure of defined benefit plans [line items]  
Estimated future benefit payments Rp 5,620
Post-employment health care benefit cost | Within 10-20 years  
Disclosure of defined benefit plans [line items]  
Estimated future benefit payments 6,913
Post-employment health care benefit cost | Within 20-30 years  
Disclosure of defined benefit plans [line items]  
Estimated future benefit payments 6,217
Post-employment health care benefit cost | Within 30-40 years  
Disclosure of defined benefit plans [line items]  
Estimated future benefit payments 3,193
Post-employment health care benefit cost | Within 40-50 years  
Disclosure of defined benefit plans [line items]  
Estimated future benefit payments 661
Post-employment health care benefit cost | Within 50-60 years  
Disclosure of defined benefit plans [line items]  
Estimated future benefit payments 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 | Y 3.13
Other post-employment benefit cost | Within next 10 years  
Disclosure of defined benefit plans [line items]  
Estimated future benefit payments Rp 485
Other post-employment benefit cost | Within 10-20 years  
Disclosure of defined benefit plans [line items]  
Estimated future benefit payments 91
Other post-employment benefit cost | Within 20-30 years  
Disclosure of defined benefit plans [line items]  
Estimated future benefit payments 39
Other post-employment benefit cost | Within 30-40 years  
Disclosure of defined benefit plans [line items]  
Estimated future benefit payments Rp 3
Pension benefit cost | Telkomsel  
Disclosure of defined benefit plans [line items]  
Weighted average duration of DBO | Y 10.58
Pension benefit cost | Telkomsel | Within next 10 years  
Disclosure of defined benefit plans [line items]  
Estimated future benefit payments Rp 2,498
Pension benefit cost | Telkomsel | Within 10-20 years  
Disclosure of defined benefit plans [line items]  
Estimated future benefit payments 7,880
Pension benefit cost | Telkomsel | Within 20-30 years  
Disclosure of defined benefit plans [line items]  
Estimated future benefit payments 6,680
Pension benefit cost | Telkomsel | Within 30-40 years  
Disclosure of defined benefit plans [line items]  
Estimated future benefit payments Rp 1,580
The company | Defined pension benefit obligation  
Disclosure of defined benefit plans [line items]  
Weighted average duration of DBO | Y 9.11
The company | Defined pension benefit obligation | Within next 10 years  
Disclosure of defined benefit plans [line items]  
Estimated future benefit payments Rp 16,370
The company | Defined pension benefit obligation | Within 10-20 years  
Disclosure of defined benefit plans [line items]  
Estimated future benefit payments 20,349
The company | Defined pension benefit obligation | Within 20-30 years  
Disclosure of defined benefit plans [line items]  
Estimated future benefit payments 16,207
The company | Defined pension benefit obligation | Within 30-40 years  
Disclosure of defined benefit plans [line items]  
Estimated future benefit payments 9,400
The company | Defined pension benefit obligation | Within 40-50 years  
Disclosure of defined benefit plans [line items]  
Estimated future benefit payments 3,383
The company | Defined pension benefit obligation | Within 50-60 years  
Disclosure of defined benefit plans [line items]  
Estimated future benefit payments 644
The company | Defined pension benefit obligation | Within 60-70 years  
Disclosure of defined benefit plans [line items]  
Estimated future benefit payments 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 | Y 9.11
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 | Y 3.97
The company | Unfunded Pension | Within next 10 years  
Disclosure of defined benefit plans [line items]  
Estimated future benefit payments Rp 948
The company | Unfunded Pension | Within 10-20 years  
Disclosure of defined benefit plans [line items]  
Estimated future benefit payments 160
The company | Unfunded Pension | Within 20-30 years  
Disclosure of defined benefit plans [line items]  
Estimated future benefit payments 29
The company | Unfunded Pension | Within 30-40 years  
Disclosure of defined benefit plans [line items]  
Estimated future benefit payments Rp 9