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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Components of net periodic pension benefit cost (Details) $ in Millions, Rp in Billions | 12 Months Ended
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Dec. 31, 2019 USD ($) | Dec. 31, 2019 IDR (Rp) | Dec. 31, 2018 IDR (Rp) | Dec. 31, 2017 IDR (Rp)
Disclosure of defined benefit plans [line items] |  |  |  |
Net periodic pension benefit cost |  | Rp 1,176 | Rp 1,600 | Rp 2,080
Defined benefit plan actuarial gain (loss) - net of tax | $ 152 | 2,109 | (4,820) | 2,375
Pension benefit cost |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Net periodic pension benefit cost |  | 840 | 1,120 | 1,700
The company | Funded pension |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Service costs |  | 259 | 384 | 366
Past service cost - plan amendments |  |  |  | 94
Plan administration cost |  | 63 | 62 | 57
Net interest cost |  | 76 | 102 | 66
Net periodic pension benefit cost |  | 398 | 548 | 583
Amount charged to subsidiaries under contractual agreements |  | (36) | (37) | (26)
Net periodic pension benefit cost |  | 362 | 511 | 557
Experience adjustments |  | (677) | 329 | 163
Changes in financial assumptions |  | 1,952 | (3,020) | 2,699
Changes in demographic assumptions |  | 239 |  |
Return on plan assets (excluding amount included in net interest expense) |  | (398) | 1,455 | (1,708)
Defined benefit plan actuarial gain (loss) - net of tax |  | Rp 1,116 | Rp (1,236) | Rp 1,154
Discount rate | 7.25% | 7.25% | 8.25% | 6.75%
Rate of compensation increases | 8.00% | 8.00% | 8.00% | 8.00%

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- Definition The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_144&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The expected rate of salary increases used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_144&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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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 2019-01-01 -Paragraph 91 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_91_a&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_7&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 5 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_5&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from charged to subsidiaries. + References No definition available. + Details
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- Definition Amount of actuarial gain/(loss) arising from changes in demographic assumptions. + References No definition available. + Details
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- Definition Amount of actuarial (loss)/gain arising from changes in experience. + References No definition available. + Details
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- Definition Amount of actuarial (loss)/gain arising from changes in financial assumptions. + References No definition available. + Details
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- Definition Amount of administrative cost expense recognized related to defined benefit plan. + References No definition available. + Details
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- Definition Amount of past service cost expense recognized related to defined benefit plan. + References No definition available. + Details
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- Definition Amount of return on plan assets. + References No definition available. + Details
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- Definition Amount of interest expense recognized related to defined benefit plan. + References No definition available. + Details
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- Definition Amount of service cost expense recognized related to defined benefit plan. + References No definition available. + Details
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- Definition The amount of post-employment benefit expense before charging to subsidiaries under contractual agreements relating to defined benefit plans. + References No definition available. + Details
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