PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Telkomsel - Components (Details) $ in Millions, Rp in Billions	12 Months Ended
Dec. 31, 2017 USD ($)	Dec. 31, 2017 IDR (Rp)	Dec. 31, 2016 IDR (Rp)	Dec. 31, 2015 IDR (Rp)
Disclosure of defined benefit plans [line items]
Net periodic pension benefit cost		Rp 2,080	Rp 1,361	Rp 759
Defined benefit plan actuarial gain (loss) - net of tax	$ 175	2,375	2,058	(368)
Pension benefit cost
Disclosure of defined benefit plans [line items]
Net periodic pension benefit cost		1,700	1,068	443
Pension benefit cost \| Telkomsel
Disclosure of defined benefit plans [line items]
Service costs		149	107	101
Net interest cost		98	74	78
Net periodic pension benefit cost		247	181	179
Experience adjustments		(77)	32	(20)
Changes in financial assumptions		661	360	(44)
Return on plan assets (excluding amount included in net interest expense)		(54)	(100)	236
Defined benefit plan actuarial gain (loss) - net of tax		Rp 530	Rp 292	Rp 172
Discount rate	7.00%	7.00%	8.25%	9.25%
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]]

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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]]

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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.

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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

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The amount of post-employment benefit expense relating to defined benefit plans. [Refer: Defined benefit plans [member]]

+ References

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

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

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Amount of return on plan assets.

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Amount of interest expense recognized related to defined benefit plan.

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

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