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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Components of net periodic pension benefit cost (Details) $ in Millions, Rp in Billions	12 Months Ended
	Dec. 31, 2021 IDR (Rp)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 IDR (Rp)	Dec. 31, 2019 IDR (Rp)
Disclosure of defined benefit plans [line items]
Net periodic pension benefit cost	Rp 1,680		Rp 1,449	Rp 1,176
Defined benefit plan actuarial (gain) losses - net of tax	1,955	$ 136	(3,596)	(2,109)
Periodic pension benefit cost
Disclosure of defined benefit plans [line items]
Net periodic pension benefit cost	1,137		804	840
The company | Funded pension
Disclosure of defined benefit plans [line items]
Service cost	269		260	259
Plan administrative costs	60		61	63
Net interest cost	354		161	76
Additional welfare benefits	80		80
Net periodic pension benefit cost	763		562	398
Amount charged to subsidiaries under contractual agreements	(31)		(17)	(36)
Net periodic pension benefit cost	732		545	362
Experience adjustments	340		(356)	677
Changes in financial assumptions	1,122		(2,190)	(1,952)
Changes in demographic assumptions			(195)	(239)
Return on plan assets (excluding amount included in net interest expense)	(339)		(201)	398
Defined benefit plan actuarial (gain) losses - net of tax	Rp 1,123		Rp (2,942)	Rp (1,116)
Discount rate	7.00%	7.00%	6.50%	7.25%
Rate of compensation increases	8.00%	8.00%	8.00%	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

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- Definition

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

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The amount of other comprehensive income, net of tax, resulting from actuarial gains (losses) arising from changes in demographic assumptions that result in remeasurements of the net defined benefit liability (asset). Demographic assumptions deal with matters such as: (a) mortality; (b) rates of employee turnover, disability and early retirement; (c) the proportion of plan members with dependants who will be eligible for benefits; (d) the proportion of plan members who will select each form of payment option available under the plan terms; and (e) claim rates under medical plans. [Refer: Other comprehensive income, net of tax, gains (losses) on remeasurements of defined benefit plans] [Contrast: Decrease (increase) in net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in demographic assumptions]

+ References

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The amount of other comprehensive income, net of tax, resulting from actuarial gains (losses) arising from changes in financial assumptions that result in remeasurements of the net defined benefit liability (asset). Financial assumptions deal with items such as: (a) the discount rate; (b) benefit levels, excluding any cost of the benefits to be met by employees, and future salary; (c) in the case of medical benefits, future medical costs, including claim handling costs (ie the costs that will be incurred in processing and resolving claims, including legal and adjuster's fees); and (d) taxes payable by the plan on contributions relating to service before the reporting date or on benefits resulting from that service. [Refer: Other comprehensive income, net of tax, gains (losses) on remeasurements of defined benefit plans] [Contrast: Decrease (increase) in net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions]

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The amount of other comprehensive income, net of tax, resulting from actuarial gains (losses) arising from experience adjustments that result in remeasurements of the net defined benefit liability (asset). Experience adjustments deal with the effects of differences between the previous actuarial assumptions and what has actually occurred. [Refer: Other comprehensive income, net of tax, gains (losses) on remeasurements of defined benefit plans] [Contrast: Decrease (increase) in net defined benefit liability (asset) resulting from actuarial gains (losses) arising from experience adjustments]

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The amount of administration costs in the current period related to defined benefit plans that are not reflected in the return on plan assets. [Refer: Administrative expenses; Post-employment benefit expense in profit or loss, defined benefit plans] [Contrast: Increase (decrease) in net defined benefit liability (asset) resulting from administration costs not reflected in return on plan assets; Return on plan assets excluding interest income or expense, net of tax, defined benefit plans; Return on plan assets excluding interest income or expense, before tax, defined benefit plans]

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- Definition

The expense of employee service in the current period arising from defined benefit plans. [Refer: Post-employment benefit expense in profit or loss, defined benefit plans] [Contrast: Increase in net defined benefit liability (asset) resulting from current service cost]

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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The amount of interest expense arising from defined benefit plans. [Refer: Interest expense; Post-employment benefit expense in profit or loss, defined benefit plans] [Contrast: Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income)]

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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)] [Contrast: Decrease (increase) in net defined benefit liability (asset) resulting from gain (loss) on remeasurement in other comprehensive income]

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The amount of post-employment benefit expense included in profit or loss relating to defined benefit plans. [Refer: Profit (loss); Defined benefit plans [member]] [Contrast: Increase (decrease) in net defined benefit liability (asset) resulting from expense (income) in profit or loss]

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The amount of additional welfare benefits.

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No definition available.

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The increase (decrease) in the net defined benefit liability (asset) resulting from charged to subsidiaries.

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Amount of return on plan assets.

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

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