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SIGNIFICANT COMMITMENTS AND AGREEMENTS - Radio Frequency Usage (Details) - IDR (Rp) Rp in Billions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of Significant Commitments and Agreements [Line Items] |  |  |
Radio frequency usage charges | Rp 5,473 | Rp 4,276 | Rp 3,687
Telkomsel |  |  |
Disclosure of Significant Commitments and Agreements [Line Items] |  |  |
Period for radio frequency usage | 10 years |  |
Amount of performance bond | Rp 20 |  |
Amount of surety bond | Rp 1,030 |  |

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