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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Obligation under the Labor Law (Details) - IDR (Rp) Rp in Billions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of defined benefit plans [line items]
Post-employment benefit expense, defined benefit plans	Rp 1,176	Rp 1,600	Rp 2,080
Amount recognised in other comprehensive income before tax adjustment	(2,520)	5,418	(2,869)
Obligation under the Labor Law
Disclosure of defined benefit plans [line items]
Net defined benefit liability (asset)	690	507
Post-employment benefit expense, defined benefit plans	136	113	62
Amount recognised in other comprehensive income before tax adjustment	Rp (107)	Rp 14	Rp (72)

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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 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
-Name IAS
-Number 19
-IssueDate 2019-01-01
-Paragraph 140
-Subparagraph a
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-URIDate 2019-03-27

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- Definition

The amount of other comprehensive income, before 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, before tax; Defined benefit plans [member]; Plan assets [member]; Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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-URIDate 2019-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2019-01-01
-Paragraph 5
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