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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Telkomsel - Components (Details) $ in Millions, Rp in Billions | 12 Months Ended
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Dec. 31, 2018 USD ($) | Dec. 31, 2018 IDR (Rp) | Dec. 31, 2017 IDR (Rp) | Dec. 31, 2016 IDR (Rp)
Disclosure of defined benefit plans [line items] |  |  |  |
Net periodic pension benefit cost |  | Rp 1,600 | Rp 2,080 | Rp 1,361
Defined benefit plan actuarial gain (loss) - net of tax | $ (335) | (4,820) | 2,375 | 2,058
Pension benefit cost |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Net periodic pension benefit cost |  | 1,120 | 1,700 | 1,068
Pension benefit cost | Telkomsel |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Service costs |  | 213 | 149 | 107
Net interest cost |  | 129 | 98 | 74
Net periodic pension benefit cost |  | 342 | 247 | 181
Experience adjustments |  | 192 | (77) | 32
Changes in financial assumptions |  | (774) | 661 | 360
Return on plan assets (excluding amount included in net interest expense) |  | 68 | (54) | (100)
Defined benefit plan actuarial gain (loss) - net of tax |  | Rp (514) | Rp 530 | Rp 292
Discount rate | 8.25% | 8.25% | 7.00% | 8.25%
Rate of compensation increases | 8.00% | 8.00% | 8.00% | 8.00%

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- Definition The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_144&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The expected rate of salary increases used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_144&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of other comprehensive income, net of tax, related to gains (losses) on remeasurements of defined benefit plans, which comprise actuarial gains and losses; the return on plan assets, excluding amounts included in net interest on the net defined benefit liability (asset); and any change in the effect of the asset ceiling, excluding amounts included in net interest on the net defined benefit liability (asset). [Refer: Other comprehensive income; Defined benefit plans [member]; Plan assets [member]; Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 91 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_91_a&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_7&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of post-employment benefit expense relating to defined benefit plans. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 5 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_5&doctype=Standard -URIDate 2018-03-16 + Details
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