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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Additional pension benefit cost (Details) - Additional pension benefit obligation - IDR (Rp) Rp in Billions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of net defined benefit liability (asset) [line items]
Net periodic pension benefit cost	Rp 1	Rp 69	Rp 657
Changes in asset ceiling excluding amount in net interest	5
The company.
Disclosure of net defined benefit liability (asset) [line items]
Pension benefit obligations at beginning of year	6	1,076
Net periodic pension benefit cost	1	69
Provision of additional pension benefit		(205)
Actuarial gains recognized in OCI	12	948
Return on plan assets (excluding amount included in net interest expense)	5	14
Pension benefit obligations at end of year		6	1,076
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	104	1,076
Interest costs and interest income from assets	9	69
Actuarial gains recognized in OCI	(17)	(948)
Pension benefits paid	(96)	(93)
Pension benefit obligations at end of year		104	Rp 1,076
Plan assets | The company.
Disclosure of net defined benefit liability (asset) [line items]
Pension benefit obligations at beginning of year	98
Interest costs and interest income from assets	8
Provision of additional pension benefit		205
Return on plan assets (excluding amount included in net interest expense)	(5)	(14)
Pension benefits paid	(96)	(93)
Pension benefit obligations at end of year	5	98
Present value of the defined benefit obligations net of effect of asset ceiling limit | The company.
Disclosure of net defined benefit liability (asset) [line items]
Pension benefit obligations at beginning of year	6
Pension benefit obligations at end of year		6
(Surplus) deficit in the program	(5)	Rp 6
Changes in asset ceiling excluding amount in net interest	Rp 5

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- Definition

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+ References

No definition available.

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- Definition

The decrease (increase) in the net defined benefit liability (asset) resulting from the gain (loss) on changes in the effect of limiting a net defined benefit asset to the asset ceiling, excluding amounts included in interest income or expense. [Refer: Interest income; Net defined benefit liability (asset); Interest expense (income), 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 c
-Clause iv
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_c_iv&doctype=Standard
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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
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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

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-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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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-IssueDate 2019-01-01
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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
-Number 19
-IssueDate 2019-01-01
-Paragraph 141
-Subparagraph g
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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2019-01-01
-Paragraph 141
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- Definition

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

+ References

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-Name IAS
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- Definition

The amount of post-employment benefit expense before charging to subsidiaries under contractual agreements relating to defined benefit plans.

+ References

No definition available.

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- Definition

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

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