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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, 2019	Dec. 31, 2018
Disclosure of defined benefit plans [line items]
Pension benefit obligations at beginning of year	Rp 419	Rp 510
Service costs	4	6
Interest income	29	26
Actuarial (gain) losses recognised in OCI	15	(24)
Benefits paid by employer	(101)	(99)
Pension benefit obligations at end of year	Rp 366	Rp 419

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
-Name IAS
-Number 19
-IssueDate 2019-01-01
-Paragraph 141
-Subparagraph f
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_f&doctype=Standard
-URIDate 2019-03-27

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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
-Name IAS
-Number 19
-IssueDate 2019-01-01
-Paragraph 141
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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
-Name IAS
-Number 19
-IssueDate 2019-01-01
-Paragraph 141
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_b&doctype=Standard
-URIDate 2019-03-27

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

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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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