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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Other post-employment benefits cost - 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
Other post-employment benefit cost
Disclosure of defined benefit plans [line items]
Service costs		6	6	7
Net interest cost		26	36	41
Net periodic pension benefit cost		32	42	48
Experience adjustments		40	10	2
Changes in demographic assumptions		(34)		0
Changes in financial assumptions		(30)	30	18
Defined benefit plan actuarial gain (loss) - net of tax		Rp (24)	Rp 40	Rp 20
Discount rate	8.00%	8.00%	5.75%	7.75%

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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- 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.

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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
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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
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- Definition

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

+ References

No definition available.

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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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- Definition

Amount of interest expense recognized related to defined benefit plan.

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- Definition

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

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