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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Foreign currency translations (Details)
Dec. 31, 2020
Rp / $
Rp / $
Rp / RM
Rp / MOP$
Rp / ¥
Rp / $
Rp / €
Rp / $
Rp / $
Dec. 31, 2019
Rp / $
Rp / $
Rp / RM
Rp / MOP$
Rp / ¥
Rp / $
Rp / €
Rp / $
Rp / $
Buy | USD    
Foreign currency translations    
Foreign currency translations 14,040 13,880
Buy | Australian dollar    
Foreign currency translations    
Foreign currency translations 10,738 9,724
Buy | Singapore dollar    
Foreign currency translations    
Foreign currency translations 10,591 10,312
Buy | New Taiwan dollar    
Foreign currency translations    
Foreign currency translations 499.61 463.73
Buy | Euro    
Foreign currency translations    
Foreign currency translations | Rp / € 17,209 15,559
Buy | Japanese yen    
Foreign currency translations    
Foreign currency translations | Rp / ¥ 135.91 127.76
Buy | Malaysian ringgits    
Foreign currency translations    
Foreign currency translations | Rp / RM 3,477 3,390
Buy | Macau patacas    
Foreign currency translations    
Foreign currency translations | Rp / MOP$ 1,756 1,729
Buy | Hong Kong dollar    
Foreign currency translations    
Foreign currency translations 1,811 1,782
Sell | USD    
Foreign currency translations    
Foreign currency translations 14,060 13,885
Sell | Australian dollar    
Foreign currency translations    
Foreign currency translations 10,756 9,729
Sell | Singapore dollar    
Foreign currency translations    
Foreign currency translations 10,607 10,317
Sell | New Taiwan dollar    
Foreign currency translations    
Foreign currency translations 500.46 464.65
Sell | Euro    
Foreign currency translations    
Foreign currency translations | Rp / € 17,239 15,571
Sell | Japanese yen    
Foreign currency translations    
Foreign currency translations | Rp / ¥ 136.15 127.82
Sell | Malaysian ringgits    
Foreign currency translations    
Foreign currency translations | Rp / RM 3,485 3,394
Sell | Macau patacas    
Foreign currency translations    
Foreign currency translations | Rp / MOP$ 1,761 1,731
Sell | Hong Kong dollar    
Foreign currency translations    
Foreign currency translations 1,814 1,783