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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Health Care (Details) - Post-employment health care benefit cost - IDR (Rp) Rp in Billions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of net defined benefit liability (asset) [line items]
Pension benefit obligations at beginning of year	Rp 2,419	Rp 1,592
Return on plan assets (excluding amount included in net interest expense)	(1,082)	909
Actuarial gain (losses) recognised in OCI	3,641	(1,460)
Pension benefit obligations at end of year	Rp 195	2,419
Employee hired before November 1, 1995
Disclosure of net defined benefit liability (asset) [line items]
Minimum employee working period for benefits	20 years
Present value of the defined benefit obligations
Disclosure of net defined benefit liability (asset) [line items]
Pension benefit obligations at beginning of year	Rp 15,448	13,357
Net interest income (costs)	1,102	1,115
Actuarial gain (losses) recognised in OCI	(3,641)	1,460
Benefits paid	486	484
Pension benefit obligations at end of year	12,423	15,448
Plan assets
Disclosure of net defined benefit liability (asset) [line items]
Pension benefit obligations at beginning of year	(13,029)	(11,765)
Net interest income (costs)	(927)	(979)
Return on plan assets (excluding amount included in net interest expense)	(1,082)	909
Benefits paid	(486)	(484)
Plan administration costs	(160)	(140)
Pension benefit obligations at end of year	Rp (12,228)	Rp (13,029)

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- Definition

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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- Definition

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]]

+ References

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The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan. [Refer: Net defined benefit liability (asset)]

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

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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 minimum period of employed required for getting benefits under defined benefits plan.

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