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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Additional pension benefit cost (Details) - Additional pension benefit obligation - The company. - IDR (Rp) Rp in Billions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of net defined benefit liability (asset) [line items]
Pension benefit obligations at beginning of year	Rp 1,076
Past service costs		Rp 657
Interest costs	69
Actuarial losses (gain) recognised in OCI	(948)	419
Provision of additional pension benefit	(205)
Return on plan assets (excluding amount included in net interest expense)	14
Pension benefit obligations at end of year	6	1,076
Present value of the defined benefit obligations
Disclosure of net defined benefit liability (asset) [line items]
Pension benefit obligations at beginning of year	1,076
Past service costs		657
Interest costs	69
Actuarial losses (gain) recognised in OCI	948	(419)
Pension benefits paid	(93)
Pension benefit obligations at end of year	104	Rp 1,076
Plan assets
Disclosure of net defined benefit liability (asset) [line items]
Provision of additional pension benefit	205
Return on plan assets (excluding amount included in net interest expense)	(14)
Pension benefits paid	(93)
Pension benefit obligations at end of year	Rp 98

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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 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)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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-IssueDate 2018-01-01
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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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- Definition

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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- Definition

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]]

+ References

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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- Definition

The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets, excluding amounts included in interest income or expense. 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]; Interest expense (income), net defined benefit liability (asset)]

+ References

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The decrease (increase) in the net defined benefit liability (asset) resulting from provision of additional benefit.

+ References

No definition available.

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