PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Health Care - Components (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 net defined benefit liability (asset) [line items]
Net periodic pension benefit cost	Rp 1,764		Rp 1,585	Rp 1,680
Defined benefit actuarial gain (loss) - net	(1,389)	$ (90)	1,464	1,955
Post-employment health care benefit cost
Disclosure of net defined benefit liability (asset) [line items]
Net periodic pension benefit cost	Rp 205		Rp 213	Rp 263

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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