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OTHER RESERVES - (Details) - IDR (Rp)
Rp in Billions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
OTHER RESERVES.      
Foreign currency operations Rp 296 Rp 272  
Reclassifications to profit or loss for operations 0 0 Rp 0
Impaired amount 58 38  
Reclassifications to profit or loss for available for sale Rp 9 Rp 0 Rp 0