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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Telkomsel - Movements of pension benefit obligation (Details) Rp in Billions		12 Months Ended
	Jun. 07, 2017	Dec. 31, 2020 IDR (Rp)	Dec. 31, 2019 IDR (Rp)
Disclosure of defined benefit plans [line items]
Maximum percentage of surplus defined benefit plan	10
Threshold FSR	105
Employer's contributions		Rp (205)	Rp (233)
Periodic pension benefit cost | Telkomsel
Disclosure of defined benefit plans [line items]
Pension benefit obligations at beginning of year		2,209	1,541
Periodic pension benefit cost		(142)	(314)
Actuarial losses recognised in OCI		1,585	614
Return on plan assets (excluding amount included in net interest expense)		(31)	(53)
Employer's contributions		(53)	(207)
Pension benefit obligations at end of year		Rp 3,852	Rp 2,209

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The amount of employer contributions to retirement benefit plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets, excluding amounts included in interest income or expense. The return on plans assets is interest, dividends and other revenue derived from the plan assets, together with realised and unrealised gains or losses on the plan assets, less any costs of managing plan assets and less any tax payable by the plan itself, other than tax included in the actuarial assumptions used to measure the present value of the defined benefit obligation. [Refer: Plan assets [member]; Net defined benefit liability (asset); Actuarial assumptions [member]; Interest expense (income), net defined benefit liability (asset)]

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The amount of decrease (increase) in the net defined benefit liability (asset) resulting from the actuarial gain or losses.

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Threshold funding sufficiency ratio to establish additional benefit fund.

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Maximum percentage of surplus defined benefit plan to establish additional benefit fund.

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