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CASH AND CASH EQUIVALENTS - Interest Rates on Cash and Cash Equivalents (Details) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Rupiah | Minimum |  |
CASH AND CASH EQUIVALENTS |  |
Interest rate on time deposits | 2.60% | 2.85%
Rupiah | Maximum |  |
CASH AND CASH EQUIVALENTS |  |
Interest rate on time deposits | 9.25% | 8.50%
Foreign currency | Minimum |  |
CASH AND CASH EQUIVALENTS |  |
Interest rate on time deposits | 0.50% | 0.40%
Foreign currency | Maximum |  |
CASH AND CASH EQUIVALENTS |  |
Interest rate on time deposits | 3.75% | 3.50%

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