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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Additional pension benefit cost (Details) - Additional pension benefit obligation - IDR (Rp) Rp in Billions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Net periodic pension benefit cost | Rp 1 | Rp 69 | Rp 657
Changes in asset ceiling excluding amount in net interest | 5 |  |
The company. |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Pension benefit obligations at beginning of year | 6 | 1,076 |
Net periodic pension benefit cost | 1 | 69 |
Provision of additional pension benefit |  | (205) |
Actuarial gains recognized in OCI | 12 | 948 |
Return on plan assets (excluding amount included in net interest expense) | 5 | 14 |
Pension benefit obligations at end of year |  | 6 | 1,076
Present value of the defined benefit obligations | The company. |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Pension benefit obligations at beginning of year | 104 | 1,076 |
Interest costs and interest income from assets | 9 | 69 |
Actuarial gains recognized in OCI | (17) | (948) |
Pension benefits paid | (96) | (93) |
Pension benefit obligations at end of year |  | 104 | Rp 1,076
Plan assets | The company. |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Pension benefit obligations at beginning of year | 98 |  |
Interest costs and interest income from assets | 8 |  |
Provision of additional pension benefit |  | 205 |
Return on plan assets (excluding amount included in net interest expense) | (5) | (14) |
Pension benefits paid | (96) | (93) |
Pension benefit obligations at end of year | 5 | 98 |
Present value of the defined benefit obligations net of effect of asset ceiling limit | The company. |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Pension benefit obligations at beginning of year | 6 |  |
Pension benefit obligations at end of year |  | 6 |
(Surplus) deficit in the program | (5) | Rp 6 |
Changes in asset ceiling excluding amount in net interest | Rp 5 |  |

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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 decrease (increase) in a net defined benefit liability (asset) resulting from the remeasurement of that net defined benefit liability (asset). [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 c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_c&doctype=Standard -URIDate 2019-03-27 + Details
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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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- Definition The fair value of any plan assets, less the present value of the defined benefit obligation. [Refer: Plan assets [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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- 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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