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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Components of net periodic pension benefit cost (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
The company | Funded pension
Disclosure of defined benefit plans [line items]
Service costs		366	363	218
Past service cost - plan amendments		94	245	(55)
Plan administration cost		57	46	71
Net interest cost		66	(14)	(131)
Settlement				(76)
Net periodic pension benefit cost		583	640	27
Amount charged to subsidiaries under contractual agreements		(26)	(32)	(15)
Net periodic pension benefit cost		557	608	12
Experience adjustments		163	70	(991)
Changes in demographic assumptions			140	137
Changes in financial assumptions		2,699	1,470	(812)
Effect of asset ceiling				(357)
Return on plan assets (excluding amount included in net interest expense)		(1,708)	(1,188)	1,837
Defined benefit plan actuarial gain (loss) - net of tax		Rp 1,154	Rp 492	Rp (186)
Discount rate	6.75%	6.75%	8.00%	9.00%
Rate of compensation increases	8.00%	8.00%	8.00%	8.00%

X

- 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

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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

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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)]

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- Definition

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

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The increase (decrease) in the net defined benefit liability (asset) resulting from charged to subsidiaries.

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

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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 administrative cost expense recognized related to defined benefit plan.

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Amount of gain or loss arising from changes in effect of defined benefit plan asset liability to asset ceiling.

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

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- Definition

Amount of return on plan assets.

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- Definition

Amount of interest expense recognized related to defined benefit plan.

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Amount of settlement 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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The amount of post-employment benefit expense before charging to subsidiaries under contractual agreements relating to defined benefit plans.

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