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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
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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 The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; 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 b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_b&doctype=Standard -URIDate 2018-03-16 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_140_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan. [Refer: 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 g -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_g&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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