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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Pension benefit cost (Details) - IDR (Rp) Rp in Billions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Mar. 01, 2003	Feb. 28, 2003
Disclosure of net defined benefit liability (asset) [line items]
Employer's contributions	Rp 233
Funded pension | The company
Disclosure of net defined benefit liability (asset) [line items]
Percentage of participating employees contribution			18.00%	8.40%
Pension benefit obligations at beginning of year	(1,057)
Return on plan assets (excluding amount included in net interest expense)	(398)	Rp 1,455
Employer's contributions	233
Provision of additional benefit		(205)
Pension benefit obligations at end of year	(2,338)	(1,057)
Funded pension | Present value of the defined benefit obligations | The company
Disclosure of net defined benefit liability (asset) [line items]
Pension benefit obligations at beginning of year	20,121	22,354
Service costs	259	384
Interest income	1,599	1,459
Pension plan participants’ contributions	33	38
Actuarial gains recognized in OCI	1,514	(2,691)
Pension benefits paid	(1,465)	(1,423)
Pension benefit obligations at end of year	22,061	20,121
Funded pension | Plan assets | The company
Disclosure of net defined benefit liability (asset) [line items]
Pension benefit obligations at beginning of year	(19,064)	(20,814)
Interest income	(1,524)	(1,357)
Return on plan assets (excluding amount included in net interest expense)	398	(1,455)
Pension plan participants’ contributions	(32)	(38)
Pension benefits paid	1,465	1,423
Provision of additional benefit		(205)
Plan administration costs	(63)	(62)
Pension benefit obligations at end of year	Rp (19,723)	Rp (19,064)

X

- Definition

The decrease (increase) in the net defined benefit liability (asset) resulting from contributions to a defined benefit plan by plan participants. [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)]

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The amount of employer contributions to retirement benefit plans.

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The decrease (increase) in a net defined benefit liability (asset) resulting from the remeasurement of that net defined benefit liability (asset). [Refer: 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 decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets, excluding amounts included in interest income or expense. The return on plans assets is interest, dividends and other revenue derived from the plan assets, together with realised and unrealised gains or losses on the plan assets, less any costs of managing plan assets and less any tax payable by the plan itself, other than tax included in the actuarial assumptions used to measure the present value of the defined benefit obligation. [Refer: Plan assets [member]; Net defined benefit liability (asset); Actuarial assumptions [member]; Interest expense (income), net defined benefit liability (asset)]

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The effect on the net defined benefit liability (asset) of expenses related to defined benefit plans that the entity classifies as being administrative.

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The percentage of employees contribution to defined benefit plan.

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The decrease (increase) in the net defined benefit liability (asset) resulting from provision of additional benefit.

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