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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Plan Details (Details) - The company - Funded pension - IDR (Rp) Rp in Millions |  | 12 Months Ended
--- | --- | ---
Jun. 07, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of defined benefit plans [line items] |  |  |
Percentage of companies share in total plan assets |  | 1.95% | 2.25%
Percentage of Debt Instruments Contributed to Fair Value of Plan Assets |  | 1.65% | 1.64%
Actual return on plan asset |  | Rp (158,000) | Rp 3,039,000
Minimum FSR required for non contribution to fund |  | 105.00% |
Funding sufficiency ratio |  | 105.00% |
Projected pension benefit obligations (prepaid pension benefit cost) at beginning of year |  | Rp 1,540,000 | (197,000)
Net periodic pension benefit cost |  | 548,000 | 583,000
Provision of additional pension benefit |  | 205,000 |
Actuarial gain (losses) recognised in OCI |  | (2,691,000) | 2,862,000
Return on plan assets (excluding amount included in net interest expense) |  | 1,455,000 | (1,708,000)
Projected pension benefit obligations at end of year |  | 1,057,000 | 1,540,000
Series B shares |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Equity instruments |  | 372,000 | 469,000
Corporate bonds |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Debt instruments |  | 314,000 | Rp 340,000
Retired before end of June 2002 |  |  |
Disclosure of defined benefit plans [line items] |  |  |
One time benefits paid | Rp 4,500 |  |
Retired starting from end of June 2002 until end of April 2017 |  |  |
Disclosure of defined benefit plans [line items] |  |  |
One time benefits paid |  | Rp 2,250 |

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- Definition The amount that instruments representing equity (rather than debt) constitute of the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 142 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_142_b&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition 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)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 141 -Subparagraph c -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_c_i&doctype=Standard -URIDate 2018-03-16 + Details
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