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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, 2019 | Dec. 31, 2018
Disclosure of fair value of plan assets [line items] |  |
Percentage of companies share in total plan assets | 1.73% | 2.03%
Actual return on plan asset | Rp 1,166 | Rp (315)
Level 1 |  |
Disclosure of fair value of plan assets [line items] |  |
Cash and cash equivalents | 563 | 1,115
Equity-based mutual fund | 1,202 | 1,204
Fixed income instruments | 8,071 | 7,020
Total | 12,493 | 11,893
Unquoted |  |
Disclosure of fair value of plan assets [line items] |  |
Private placement | 334 | 335
Total | 334 | 335
Finance | Level 1 |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments | 954 | 799
Manufacturing and consumer | Level 1 |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments | 706 | 799
Infrastructure and telecommunication | Level 1 |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments | 317 | 332
Construction | Level 1 |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments | 181 | 190
Wholesale | Level 1 |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments | 159 | 177
Mining | Level 1 |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments | 117 | 77
Biotechnology and pharma industry | Level 1 |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments | 96 | 85
Services | Level 1 |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments | 75 | 60
Agriculture | Level 1 |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments | 49 | 32
Miscellaneous industries | Level 1 |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments | 3 | 3
Series B shares |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments | Rp 222 | Rp 249

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- Definition The amount cash and cash equivalents contribute to 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 2019-01-01 -Paragraph 142 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_142_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount instruments representing debt (rather than equity) contribute to 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 2019-01-01 -Paragraph 142 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_142_c&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount instruments representing equity (rather than debt) contribute to 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 2019-01-01 -Paragraph 142 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_142_b&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_57_a&doctype=Standard -URIDate 2019-03-27 + Details
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