PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Telkomsel - Components (Details) $ in Millions, Rp in Billions	12 Months Ended
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%

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]]

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

Name:	ifrs-full_ActuarialAssumptionOfDiscountRates
Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- 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

+ Details

Name:	ifrs-full_ActuarialAssumptionOfExpectedRatesOfSalaryIncreases
Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

Name:	ifrs-full_DisclosureOfDefinedBenefitPlansLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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

Name:	ifrs-full_OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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

Name:	ifrs-full_PostemploymentBenefitExpenseDefinedBenefitPlans
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of actuarial (loss)/gain arising from changes in experience.

+ References

No definition available.

+ Details

Name:	tlk_DefinedBenefitPlanActuarialGainLossArisingFromChangesInExperience
Namespace Prefix:	tlk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of actuarial (loss)/gain arising from changes in financial assumptions.

+ References

No definition available.

+ Details

Name:	tlk_DefinedBenefitPlanActuarialGainLossArisingFromChangesInFinancialAssumptions
Namespace Prefix:	tlk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of return on plan assets.

+ References

No definition available.

+ Details

Name:	tlk_DefinedBenefitPlanReturnOnPlanAssets
Namespace Prefix:	tlk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of interest expense recognized related to defined benefit plan.

+ References

No definition available.

+ Details

Name:	tlk_DefinedBenefitPlansInterestExpense
Namespace Prefix:	tlk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of service cost expense recognized related to defined benefit plan.

+ References

No definition available.

+ Details

Name:	tlk_IfrsDefinedBenefitPlanServiceCost
Namespace Prefix:	tlk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	ifrs-full_FundingArrangementsOfDefinedBenefitPlansAxis=tlk_DefinedBenefitPensionPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=tlk_PtTelekomunikasiSelularMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: