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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Health Care (Details) - Post-employment health care benefit cost - IDR (Rp) Rp in Billions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Disclosure of net defined benefit liability (asset) [line items] |  |
Pension benefit obligations at beginning of year | Rp 195 | Rp 2,419
Return on plan assets (excluding amount included in net interest expense) | 271 | (1,082)
Actuarial (gain) losses recognized in OCI | (905) | 3,641
Pension benefit obligations at end of year | Rp 996 | 195
Employee hired before November 1, 1995 |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Minimum employee working period for benefits | 20 years |
Present value of the defined benefit obligations |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Pension benefit obligations at beginning of year | Rp 12,423 | 15,448
Interest income | 1,062 | 1,102
Actuarial (gain) losses recognized in OCI | 905 | (3,641)
Benefits paid | (567) | (486)
Pension benefit obligations at end of year | 13,823 | 12,423
Plan assets |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Pension benefit obligations at beginning of year | (12,228) | (13,029)
Interest income | (1,045) | (927)
Return on plan assets (excluding amount included in net interest expense) | (271) | 1,082
Benefits paid | 567 | 486
Plan administration costs | (150) | (160)
Pension benefit obligations at end of year | Rp (12,827) | Rp (12,228)

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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; 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 b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_b&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_140_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan. [Refer: 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 g -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_g&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets, excluding amounts included in interest income or expense. The return on plans assets is interest, dividends and other revenue derived from the plan assets, together with realised and unrealised gains or losses on the plan assets, less any costs of managing plan assets and less any tax payable by the plan itself, other than tax included in the actuarial assumptions used to measure the present value of the defined benefit obligation. [Refer: Plan assets [member]; Net defined benefit liability (asset); Actuarial assumptions [member]; 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 i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_c_i&doctype=Standard -URIDate 2019-03-27 + Details
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