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CASH AND CASH EQUIVALENTS - Interest Rates on Cash and Cash Equivalents (Details)
12 Months Ended
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%