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LONG-TERM LOANS AND OTHER BORROWINGS - Bonds (Details) - IDR (Rp)
Rp in Billions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Bonds and notes    
Borrowings and other credit facilities    
Total loans and other borrowings Rp 10,495 Rp 8,995
2010 - Series B Bonds    
Borrowings and other credit facilities    
Total loans and other borrowings Rp 1,995  
Interest rate (as a percent) 10.20%  
Maximum debt to equity ratio 2  
Minimum EBITDA to finance costs ratio 5  
Minimum debt service coverage 125.00%  
2015 Bonds    
Borrowings and other credit facilities    
Total loans and other borrowings Rp 7,000  
Maximum debt to equity ratio 2  
Minimum EBITDA to finance costs ratio 4  
Minimum debt service coverage 125.00%  
2015 - Series A Bonds    
Borrowings and other credit facilities    
Total loans and other borrowings Rp 2,200  
Interest rate (as a percent) 9.93%  
2015 - Series B Bonds    
Borrowings and other credit facilities    
Total loans and other borrowings Rp 2,100  
Interest rate (as a percent) 10.25%  
2015 - Series C Bonds    
Borrowings and other credit facilities    
Total loans and other borrowings Rp 1,200  
Interest rate (as a percent) 10.60%  
2015 - Series D Bonds    
Borrowings and other credit facilities    
Total loans and other borrowings Rp 1,500  
Interest rate (as a percent) 11.00%