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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Sensitivity Analysis (Details) - IDR (Rp) Rp in Billions | Dec. 31, 2019 | Dec. 31, 2018
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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% |
Telkomsel | Discount Rate |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Amount of increase in actuarial assumptions |  | Rp (497)
Amount of decrease in actuarial assumptions |  | 562
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)
Post-employment health care benefit cost | Discount Rate |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Amount of increase in actuarial assumptions | Rp (1,551) | (1,428)
Amount of decrease in actuarial assumptions | 1,888 | 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 | 2,030 | 1,783
Amount of decrease in actuarial assumptions | (1,689) | (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) | (12)
Amount of decrease in actuarial assumptions | 13 | 13
Pension benefit cost | Telkomsel | Discount Rate |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Amount of increase in actuarial assumptions | (686) |
Amount of decrease in actuarial assumptions | 777 |
Pension benefit cost | Telkomsel | Rate of Compensation |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Amount of increase in actuarial assumptions | 390 |
Amount of decrease in actuarial assumptions | (366) |
Defined pension benefit obligation | Discount Rate |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Amount of increase in actuarial assumptions | (1,952) | (1,568)
Amount of decrease in actuarial assumptions | 2,416 | 1,832
Defined pension benefit obligation | Rate of Compensation |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Amount of increase in actuarial assumptions | 257 | 275
Amount of decrease in actuarial assumptions | (275) | (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 | (40) | (41)
Amount of decrease in actuarial assumptions | 33 | 38
Unfunded Pension | Rate of Compensation |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Amount of increase in actuarial assumptions | 34 | 42
Amount of decrease in actuarial assumptions | Rp (43) | Rp (45)

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- Definition 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]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_145_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition 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]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_145_a&doctype=Standard -URIDate 2019-03-27 + Details
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