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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Other post-employment benefits cost - Components (Details) $ in Millions, Rp in Billions	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2020 IDR (Rp)	Dec. 31, 2019 IDR (Rp)	Dec. 31, 2018 IDR (Rp)
Disclosure of defined benefit plans [line items]
Net periodic pension benefit cost		Rp 1,449	Rp 1,176	Rp 1,600
Defined benefit plan actuarial gain (loss) - net of tax	$ 256	3,596	2,109	(4,820)
Other post-employment benefit cost
Disclosure of defined benefit plans [line items]
Service costs		4	4	6
Net interest cost		19	29	26
Past service costs		58
Net periodic pension benefit cost		81	33	32
Experience adjustments		(18)	(25)	40
Changes in demographic assumptions		16	20	(34)
Changes in financial assumptions		17	20	(30)
Defined benefit plan actuarial gain (loss) - net of tax		Rp 15	Rp 15	Rp (24)
Discount rate	5.00%	5.00%	6.25%	8.00%

X

- Definition

The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2020-01-01
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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 other comprehensive income, net of 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; Defined benefit plans [member]; Plan assets [member]; 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 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 amount of post-employment benefit expense relating to defined benefit plans. [Refer: Defined benefit plans [member]]

+ References

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- Definition

Amount of actuarial gain/(loss) arising from changes in demographic assumptions.

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Amount of actuarial (loss)/gain arising from changes in experience.

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Amount of actuarial (loss)/gain arising from changes in financial assumptions.

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Amount of interest expense recognized related to defined benefit plan.

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- Definition

Amount of service cost expense recognized related to defined benefit plan.

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No definition available.

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