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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Other post-employment benefits cost (Details) - Other post-employment benefit cost - IDR (Rp) Rp in Billions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of defined benefit plans [line items]
Pension benefit obligations at beginning of year	Rp 502	Rp 497
Service costs	6	7
Net interest income (costs)	36	41
Actuarial gain (losses) recognized in OCI	40	20
Benefits paid by employer	(74)	(63)
Pension benefit obligations at end of year	Rp 510	Rp 502

X

- 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2017-01-01
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-URIDate 2017-03-09

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X

- 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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 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
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-Paragraph 141
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X

- 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

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

The amount of decrease (increase) in the net defined benefit liability (asset) resulting from the actuarial gain or losses.

+ References

No definition available.

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