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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Sensitivity Analysis (Details) Rp in Billions	Dec. 31, 2018 IDR (Rp)
Discount Rate
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Percentage of increase in actuarial assumptions	1.00%
Percentage of decrease in actuarial assumptions	1.00%
Rate of Compensation
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Percentage of increase in actuarial assumptions	1.00%
Percentage of decrease in actuarial assumptions	1.00%
Post-employment health care benefit cost | Discount Rate
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Amount of increase in actuarial assumptions	Rp (1,428)
Amount of decrease in actuarial assumptions	1,815
Post-employment health care benefit cost | Rate of Compensation
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Amount of increase in actuarial assumptions	1,783
Amount of decrease in actuarial assumptions	(1,508)
Other post-employment benefit cost | Discount Rate
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Amount of increase in actuarial assumptions	(12)
Amount of decrease in actuarial assumptions	13
Pension benefit cost | Telkomsel | Discount Rate
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Amount of increase in actuarial assumptions	(497)
Amount of decrease in actuarial assumptions	562
Pension benefit cost | Telkomsel | Rate of Compensation
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Amount of increase in actuarial assumptions	294
Amount of decrease in actuarial assumptions	(276)
Defined pension benefit obligation | Discount Rate
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Amount of increase in actuarial assumptions	(1,568)
Amount of decrease in actuarial assumptions	1,832
Defined pension benefit obligation | Rate of Compensation
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Amount of increase in actuarial assumptions	275
Amount of decrease in actuarial assumptions	(286)
Additional pension benefit obligation | Discount Rate
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Amount of increase in actuarial assumptions	(2)
Amount of decrease in actuarial assumptions	1
Unfunded Pension | Discount Rate
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Amount of increase in actuarial assumptions	(41)
Amount of decrease in actuarial assumptions	38
Unfunded Pension | Rate of Compensation
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Amount of increase in actuarial assumptions	42
Amount of decrease in actuarial assumptions	Rp (45)

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The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]]

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The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]]

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