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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, 2017 | Dec. 31, 2016
Disclosure of fair value of plan assets [line items] |  |
Percentage of companies share in total plan assets | 2.04% | 1.84%
Actual return on plan asset | Rp 1,748 | Rp 1,357
Level 1 |  |
Disclosure of fair value of plan assets [line items] |  |
Cash and cash equivalents | 1,354 | 894
Equity-based mutual fund | 1,113 | 1,311
Fixed income instruments | 7,642 | 7,241
Total | 12,732 | 11,533
Unquoted |  |
Disclosure of fair value of plan assets [line items] |  |
Private placement | 297 | 232
Total | 297 | 232
Manufacturing and consumer | Level 1 |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments | 835 | 754
Finance | Level 1 |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments | 840 | 540
Construction | Level 1 |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments | 254 | 351
Infrastructure and telecommunication | Level 1 |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments | 350 | 245
Wholesale | Level 1 |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments | 137 | 101
Mining | Level 1 |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments | 65 | 27
Services | Level 1 |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments | 38 | 17
Agriculture | Level 1 |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments | 35 | 44
Biotechnology and Pharma Industry | Level 1 |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments | 68 | 6
Miscellaneous industries | Level 1 |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments | 1 | 2
Series B shares |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments | Rp 265 | Rp 217

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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 2017-01-01 -Paragraph 142 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_142_a&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 142 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_142_c&doctype=Standard -URIDate 2017-03-09 + Details
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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 2017-01-01 -Paragraph 142 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_142_b&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_57_a&doctype=Standard -URIDate 2017-03-09 + Details
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