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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Unfunded Pension (Details) Rp in Billions	12 Months Ended
	Dec. 31, 2017 IDR (Rp) Y	Dec. 31, 2016 IDR (Rp)
Additional pension benefit obligation
Disclosure of defined benefit plans [line items]
Pension benefit obligations at end of year	Rp 1,076
The company | Unfunded Pension
Disclosure of defined benefit plans [line items]
Employer's contribution	Rp 10	Rp 9
Pre retirement employees inactiveness period	6 months
Retirement age | Y	56
Pension benefit obligations at beginning of year	Rp 2,507	2,500
Service costs	51	64
Net interest income (costs)	188	215
Actuarial gain (losses) recognized in OCI	100	119
Benefits paid by employer	(462)	(391)
Pension benefit obligations at end of year	Rp 2,384	Rp 2,507

X

- Definition

The retirement age used as a 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

The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]]

+ References

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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)]

+ References

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The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)]

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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

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The amount of contribution to the plan by employer under defined contribution plan.

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The period of employees inactiveness during pre-retirement period.

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