PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Unfunded Pension - Components of 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 \| Unfunded Pension
Disclosure of defined benefit plans [line items]
Service costs		51	64	60
Net interest cost		188	215	191
Net periodic pension benefit cost		239	279	251
Experience adjustments		19	(9)	(30)
Changes in demographic assumptions			30	50
Changes in financial assumptions		81	98	167
Defined benefit plan actuarial gain (loss) - net of tax		Rp 100	Rp 119	Rp 187
Discount rate				9.00%
The company \| Unfunded Pension \| Minimum
Disclosure of defined benefit plans [line items]
Discount rate	6.00%	6.00%	7.75%
Rate of compensation increases	6.10%	6.10%	6.10%
The company \| Unfunded Pension \| Maximum
Disclosure of defined benefit plans [line items]
Discount rate	6.75%	6.75%	8.00%
Rate of compensation increases	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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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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- Definition

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

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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 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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