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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Unfunded Pension - Components of pension benefit cost (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)
Periodic pension benefit cost
Disclosure of defined benefit plans [line items]
Net periodic pension benefit cost		804	840	1,120
The company | Unfunded Pension
Disclosure of defined benefit plans [line items]
Service costs		28	29	54
Net interest cost		89	134	144
Net periodic pension benefit cost		117	163	198
Experience adjustments		(32)	12	27
Changes in demographic assumptions		(99)	37	(21)
Changes in financial assumptions		42	45	(143)
Defined benefit plan actuarial gain (loss) - net of tax		Rp (89)	Rp 94	Rp (137)
The company | Unfunded Pension | Minimum
Disclosure of defined benefit plans [line items]
Discount rate	5.25%	5.25%	6.50%	8.00%
Rate of compensation increases	6.10%	6.10%	6.10%	6.10%
The company | Unfunded Pension | Maximum
Disclosure of defined benefit plans [line items]
Discount rate	6.50%	6.50%	7.25%	8.25%
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]]

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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, 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)]

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

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

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Amount of interest expense recognized related to defined benefit plan.

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

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