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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Unfunded Pension (Details) - The company - Unfunded Pension - IDR (Rp) Rp in Billions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disclosure of defined benefit plans [line items]
Employer's contribution	Rp 55	Rp 13
Pre retirement employees inactiveness period	6 months
Retirement age	56 years
Pension benefit obligations at beginning of year	Rp 1,830	2,384
Service costs	29	54
Interest income	134	144
Actuarial (gain) losses recognized in OCI	94	(137)
Benefits paid by employer	(608)	(615)
Pension benefit obligations at end of year	Rp 1,479	Rp 1,830

X

- Definition

The retirement age used as a 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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- Definition

The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]]

+ References

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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)]

+ References

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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.

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The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)]

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The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]]

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The amount of decrease (increase) in the net defined benefit liability (asset) resulting from the actuarial gain or losses.

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The amount of contribution to the plan by employer under defined contribution plan.

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The period of employees inactiveness during pre-retirement period.

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