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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Health Care - Components (Details) $ in Millions, Rp in Billions | 12 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2017 IDR (Rp) | Dec. 31, 2016 IDR (Rp) | Dec. 31, 2015 IDR (Rp)
Disclosure of net defined benefit liability (asset) [line items] |  |  |  |
Net periodic pension benefit cost |  | Rp 2,080 | Rp 1,361 | Rp 759
Defined benefit plan actuarial gain (loss) - net of tax | $ 175 | 2,375 | 2,058 | (368)
Post-employment health care benefit cost |  |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |  |
Service costs |  |  | 9 | 49
Plan administration cost |  | 140 | 144 | 131
Net interest cost |  | 136 | 12 | 37
Net periodic pension benefit cost |  | 276 | 165 | 217
Amount charged to subsidiaries under contractual agreements |  |  | (2) | (1)
Net periodic pension benefit cost |  | 276 | 163 | 216
Experience adjustments |  | (1,198) | 26 | (53)
Changes in demographic assumptions |  |  | 66 | 92
Changes in financial assumptions |  | 2,658 | 1,736 | (1,226)
Return on plan assets (excluding amount included in net interest expense) |  | (909) | (519) | 647
Defined benefit plan actuarial gain (loss) - net of tax |  | Rp 551 | Rp 1,309 | Rp (540)

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- Definition The amount of other comprehensive income, net of tax, related to gains (losses) on remeasurements of defined benefit plans, which comprise actuarial gains and losses; the return on plan assets, excluding amounts included in net interest on the net defined benefit liability (asset); and any change in the effect of the asset ceiling, excluding amounts included in net interest on the net defined benefit liability (asset). [Refer: Other comprehensive income; Defined benefit plans [member]; Plan assets [member]; Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 91 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_91_a&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_7&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of post-employment benefit expense relating to defined benefit plans. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 5 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_5&doctype=Standard -URIDate 2017-03-09 + Details
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