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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Pension benefit cost (Details) - IDR (Rp) Rp in Billions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Mar. 01, 2003	Feb. 28, 2003
Funded pension | The company
Disclosure of net defined benefit liability (asset) [line items]
Percentage of participating employees contribution			18.00%	8.40%
Pension benefit obligations at beginning of year	Rp (197)
Return on plan assets (excluding amount included in net interest expense)	1,708	Rp 1,188
Pension benefit obligations at end of year	1,540	(197)
Funded status	(1,540)	197
Funded pension | Present value of the defined benefit obligations | The company
Disclosure of net defined benefit liability (asset) [line items]
Pension benefit obligations at beginning of year	18,849	16,505
Service costs	366	363
Past service cost - plan amendments	94	245
Interest costs	1,454	1,444
Pension plan participants’ contributions	(41)	(44)
Actuarial losses recognized in OCI	2,862	1,680
Pension benefits paid	(1,312)	(1,432)
Pension benefit obligations at end of year	22,354	18,849
Funded pension | Plan assets | The company
Disclosure of net defined benefit liability (asset) [line items]
Pension benefit obligations at beginning of year	(19,046)	(17,834)
Interest costs	(1,388)	(1,458)
Return on plan assets (excluding amount included in net interest expense)	1,708	1,188
Pension plan participants’ contributions	41	44
Pension benefits paid	1,312	1,432
Plan administration costs	(57)	(46)
Pension benefit obligations at end of year	(20,814)	Rp (19,046)
Additional pension benefit obligation
Disclosure of net defined benefit liability (asset) [line items]
Past service cost - plan amendments	657
Actuarial losses recognized in OCI	419
Pension benefit obligations at end of year	Rp 1,076

X

- Definition

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

+ References

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

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The decrease (increase) in a net defined benefit liability (asset) resulting from the remeasurement of that net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)]

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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]]

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The increase (decrease) in the net defined benefit liability (asset) resulting from past service cost. Past service cost is the change in the present value of the defined benefit obligation for employee service in prior periods, resulting from a plan amendment (the introduction or withdrawal of, or changes to, a defined benefit plan) or a curtailment (a significant reduction by the entity in the number of employees covered by a plan). [Refer: Net defined benefit liability (asset); Defined benefit plans [member]]

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The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan. [Refer: Net defined benefit liability (asset)]

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The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets. The return on plans assets is interest, dividends and other revenue derived from the plan assets, together with realised and unrealised gains or losses on the plan assets, less any costs of managing plan assets and less any tax payable by the plan itself, other than tax included in the actuarial assumptions used to measure the present value of the defined benefit obligation. [Refer: Plan assets [member]; Net defined benefit liability (asset); Actuarial assumptions [member]]

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The present value of the defined benefit obligation, less the fair value of the plan assets (if any). [Refer: Plan assets [member]]

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The effect on the net defined benefit liability (asset) of expenses related to defined benefit plans that the entity classifies as being administrative.

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The percentage of employees contribution to defined benefit plan.

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