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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Health Care - Plan Assets (Details) - Post-employment health care benefit cost - IDR (Rp) Rp in Billions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of fair value of plan assets [line items] |  |
Percentage of companies share in total plan assets | 2.03% | 2.04%
Actual return on plan asset | Rp (315) | Rp 1,748
Level 1 |  |
Disclosure of fair value of plan assets [line items] |  |
Cash and cash equivalents | 1,115 | 1,354
Equity-based mutual fund | 1,204 | 1,113
Fixed income instruments | 7,020 | 7,642
Total | 11,893 | 12,732
Unquoted |  |
Disclosure of fair value of plan assets [line items] |  |
Private placement | 335 | 297
Total | 335 | 297
Manufacturing and consumer | Level 1 |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments | 799 | 835
Finance | Level 1 |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments | 799 | 840
Construction | Level 1 |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments | 190 | 254
Infrastructure and telecommunication | Level 1 |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments | 332 | 350
Wholesale | Level 1 |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments | 177 | 137
Mining | Level 1 |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments | 77 | 65
Services | Level 1 |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments | 60 | 38
Agriculture | Level 1 |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments | 32 | 35
Biotechnology and pharma industry | Level 1 |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments | 85 | 68
Miscellaneous industries | Level 1 |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments | 3 | 1
Series B shares |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments | Rp 249 | Rp 265

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- Definition The amount that cash and cash equivalents constitute of the fair value of defined benefit plan assets. [Refer: Cash and cash equivalents; 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 a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_142_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount that instruments representing debt (rather than equity) 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 c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_142_c&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_57_a&doctype=Standard -URIDate 2018-03-16 + Details
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