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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Components of net periodic additional 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] |  |  |  |
Defined benefit plan actuarial gain (loss) - net of tax | $ 152 | Rp 2,109 | Rp (4,820) | Rp 2,375
Additional pension benefit obligation |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Past service costs |  |  |  | 657
Interest costs |  | 1 | 69 |
Net periodic pension benefit cost |  | 1 | 69 | 657
Experience adjustments |  | (17) | (773) |
Changes in financial assumptions |  |  | (175) | 419
Return on plan assets (excluding amount included in net interest expense) |  | 5 | 14 |
Changes in asset ceiling excluding amount in net interest |  | 5 |  |
Defined benefit plan actuarial gain (loss) - net of tax |  | Rp (7) | Rp (934) | Rp 419
Discount rate | 7.25% | 7.25% | 8.25% | 6.75%
Rate of compensation increases | 8.00% | 8.00% | 8.00% | 8.00%
Additional pension benefit obligation | Minimum |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Rate of return on investment | 9.00 | 9.00 | 9.30 | 9.50
Actuarial discount rate of pension fund | 9.25 | 9.25 | 9.25 | 9.25
Additional pension benefit obligation | Maximum |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Rate of return on investment | 9.50 | 9.50 | 10.00 | 10.25
Actuarial discount rate of pension fund | 9.50 | 9.50 | 9.50 | 9.50

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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 decrease (increase) in the net defined benefit liability (asset) resulting from the gain (loss) on changes in the effect of limiting a net defined benefit asset to the asset ceiling, excluding amounts included in interest income or expense. [Refer: Interest income; Net defined benefit liability (asset); Interest expense (income), net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 141 -Subparagraph c -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_c_iv&doctype=Standard -URIDate 2019-03-27 + 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 discount rate of pension fund used as the significant actuarial assumption to determine the present value of a defined benefit obligation. + References No definition available. + Details
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- Definition The return on investments used as the significant actuarial assumption to determine the present value of a defined benefit obligation. + 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 past service cost expense recognized related to defined benefit plan. + 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 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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