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FINANCIAL RISK MANAGEMENT - Financial assets (Details) - IDR (Rp)
Rp in Billions
Dec. 31, 2018
Dec. 31, 2017
FINANCIAL RISK MANAGEMENT    
Total financial assets Rp 31,602 Rp 37,438
Loans and receivables | Cash and cash equivalents    
FINANCIAL RISK MANAGEMENT    
Total financial assets   25,145
Loans and receivables | Trade and other receivables, net    
FINANCIAL RISK MANAGEMENT    
Total financial assets   9,564
Loans and receivables | Other current financial asset    
FINANCIAL RISK MANAGEMENT    
Total financial assets   1,005
Loans and receivables | Other non-current assets    
FINANCIAL RISK MANAGEMENT    
Total financial assets   183
Available-for-sale financial assets | Available-for-sale investments    
FINANCIAL RISK MANAGEMENT    
Total financial assets   Rp 1,541
Amortized cost | Cash and cash equivalents    
FINANCIAL RISK MANAGEMENT    
Total financial assets 17,435  
Amortized cost | Trade and other receivables, net    
FINANCIAL RISK MANAGEMENT    
Total financial assets 9,928  
Amortized cost | Contract assets, net    
FINANCIAL RISK MANAGEMENT    
Total financial assets 1,560  
Amortized cost | Other current financial asset    
FINANCIAL RISK MANAGEMENT    
Total financial assets 844  
Amortized cost | Other non-current assets    
FINANCIAL RISK MANAGEMENT    
Total financial assets 443  
FVTPL | Subsidiaries' investments    
FINANCIAL RISK MANAGEMENT    
Total financial assets 709  
FVTPL | Mutual funds    
FINANCIAL RISK MANAGEMENT    
Total financial assets 470  
FVTPL | Convertible bonds    
FINANCIAL RISK MANAGEMENT    
Total financial assets Rp 213