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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, 2019 | Dec. 31, 2018
Rupiah | Minimum |  |
CASH AND CASH EQUIVALENTS |  |
Interest rate on time deposits | 4.00% | 2.60%
Rupiah | Maximum |  |
CASH AND CASH EQUIVALENTS |  |
Interest rate on time deposits | 9.25% | 9.25%
Foreign currency | Minimum |  |
CASH AND CASH EQUIVALENTS |  |
Interest rate on time deposits | 0.50% | 0.50%
Foreign currency | Maximum |  |
CASH AND CASH EQUIVALENTS |  |
Interest rate on time deposits | 3.30% | 3.75%

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