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PENSION AND OTHER POST-EMPLOYMENT BENEFITS (Details) Rp in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2017 IDR (Rp) | Dec. 31, 2016 IDR (Rp) | Dec. 31, 2015 IDR (Rp) | Dec. 31, 2017 IDR (Rp)
Disclosure of defined benefit plans [line items] |  |  |  |  |
Prepaid pension benefit cost |  |  | Rp 199,000 |  |
Pension and other post-employment benefit obligations | $ 751 |  | 6,126,000 |  | Rp 10,195,000
Employee benefit cost |  | Rp 2,080,000 | 1,361,000 | Rp 759,000 |
Amounts recognized in OCI |  | (2,869,000) | (2,266,000) | 309,000 |
Deferred tax effect at the applicable tax rates |  | 494,000 | 208,000 | 59,000 |
Defined benefit plan actuarial gain (loss) - net of tax | $ (175) | (2,375,000) | (2,058,000) | 368,000 |
Pension benefit cost |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
Prepaid pension benefit cost |  |  | 199,000 |  |
Pension and other post-employment benefit obligations |  |  | 3,700,000 |  | 6,839,000
Employee benefit cost |  | 1,700,000 | 1,068,000 | 443,000 |
Pension benefit cost | Patrakom |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
Pension and other post-employment benefit obligations |  |  | 0 |  | 0
Employee benefit cost |  | 0 | 0 |  |
Amounts recognized in OCI |  | 0 | 0 |  |
Pension benefit cost | Telkomsel |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
Pension and other post-employment benefit obligations |  |  | 1,193,000 |  | 1,839,000
Employee benefit cost |  | 247,000 | 181,000 | 179,000 |
Amounts recognized in OCI |  | (530,000) | (292,000) | (172,000) |
Defined benefit plan actuarial gain (loss) - net of tax |  | (530,000) | (292,000) | (172,000) |
Pension benefit cost | MD Media |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
Prepaid pension benefit cost |  |  | 1,000 |  |
Pension and other post-employment benefit obligations |  |  |  |  | 0
Employee benefit cost |  | 0 | 0 | 1,000 |
Amounts recognized in OCI |  | (2,000) | (1,000) | 1,000 |
Pension benefit cost | Infomedia |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
Prepaid pension benefit cost |  |  | 1,000 |  |
Pension and other post-employment benefit obligations |  |  |  |  | 0
Employee benefit cost |  | 0 | 0 | 0 |
Amounts recognized in OCI |  | (1,000) | 0 | 0 |
Additional pension benefit obligation |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
Defined benefit plan actuarial gain (loss) - net of tax |  | (419,000) |  |  |
Post-employment health care benefit cost |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
Pension and other post-employment benefit obligations |  |  | 1,592,000 |  | 2,419,000
Employee benefit cost |  | 276,000 | 163,000 | 216,000 |
Amounts recognized in OCI |  | (551,000) | (1,309,000) | 540,000 |
Defined benefit plan actuarial gain (loss) - net of tax |  | (551,000) | (1,309,000) | 540,000 |
Other post-employment benefit cost |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
Pension and other post-employment benefit obligations |  |  | 502,000 |  | 510,000
Employee benefit cost |  | 42,000 | 48,000 | 47,000 |
Amounts recognized in OCI |  | (40,000) | (20,000) | (11,000) |
Defined benefit plan actuarial gain (loss) - net of tax |  | (40,000) | (20,000) | (11,000) |
Other employee benefit cost |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
Pension and other post-employment benefit obligations |  |  | 332,000 |  | 427,000
Employee benefit cost |  | 62,000 | 82,000 | 53,000 |
Amounts recognized in OCI |  | (72,000) | (33,000) | (48,000) |
The company | Funded pension |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
Prepaid pension benefit cost |  |  | 197,000 | 1,329,000 | (1,540,000)
Employee benefit cost |  | 557,000 | 608,000 | 12,000 |
Defined benefit plan actuarial gain (loss) - net of tax |  | (1,154,000) | (492,000) | 186,000 |
The company | Defined pension benefit obligation |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
Pension and other post-employment benefit obligations |  |  |  |  | 1,540,000
Employee benefit cost |  | 557,000 | 608,000 | 12,000 |
Amounts recognized in OCI |  | (1,154,000) | (492,000) | 186,000 |
The company | Additional pension benefit obligation |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
Pension and other post-employment benefit obligations |  |  |  |  | 1,076,000
Employee benefit cost |  | 657,000 |  |  |
Amounts recognized in OCI |  | (419,000) |  |  |
The company | Unfunded Pension |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
Pension and other post-employment benefit obligations |  |  | 2,507,000 |  | Rp 2,384,000
Employee benefit cost |  | 239,000 | 279,000 | 251,000 |
Amounts recognized in OCI |  | (100,000) | (119,000) | (187,000) |
Defined benefit plan actuarial gain (loss) - net of tax |  | Rp (100,000) | Rp (119,000) | Rp (187,000) |

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