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RELATED PARTY TRANSACTIONS - Finance costs (Details) - IDR (Rp)
Rp in Billions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Transactions with related parties      
Total Rp 968 Rp 1,292 Rp 1,137
% of total finance costs 34.95% 45.98% 45.83%
Ministry of Finance      
Transactions with related parties      
Total Rp 54 Rp 64 Rp 76
% of total finance costs 1.95% 2.28% 3.06%
State-owned banks      
Transactions with related parties      
Total Rp 820 Rp 1,228 Rp 1,061
% of total finance costs 29.61% 43.70% 42.77%
SMI      
Transactions with related parties      
Total Rp 94    
% of total finance costs 3.39%