PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Unfunded Pension - Components of pension benefit cost (Details) $ in Millions, Rp in Billions	12 Months Ended
Dec. 31, 2023 IDR (Rp)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 IDR (Rp)	Dec. 31, 2021 IDR (Rp)
Disclosure of defined benefit plans [line items]
Net periodic pension benefit cost	Rp 1,764		Rp 1,585	Rp 1,680
Defined benefit plan actuarial gain (loss) - net of tax	1,389	$ 90	(1,464)	(1,955)
Periodic pension benefit cost
Disclosure of defined benefit plans [line items]
Net periodic pension benefit cost	1,319		1,268	1,137
The company \| Unfunded Pension
Disclosure of defined benefit plans [line items]
Net periodic pension benefit cost	Rp 54		Rp 58	Rp 74
Discount rate	6.75%	6.75%	7.25%	7.00%
Rate of compensation increases	8.00%	8.00%	8.00%	8.00%
The company \| Unfunded Pension \| Minimum
Disclosure of defined benefit plans [line items]
Discount rate	6.75%	6.75%	7.00%	5.75%
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			7.25%	7.00%
Rate of compensation increases	8.00%	8.00%	8.00%	8.00%

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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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 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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