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PROPERTY AND EQUIPMENT - Obligations under finance leases (Details) - IDR (Rp)
Rp in Billions
Dec. 31, 2018
Dec. 31, 2017
Obligations under finance leases    
Total Rp 3,145 Rp 3,804
PT Tower Bersama Infrastructure Tbk    
Obligations under finance leases    
Total 1,089 1,293
PT Profesional Telekomunikasi Indonesia    
Obligations under finance leases    
Total 930 1,120
PT Mandiri Utama Finance    
Obligations under finance leases    
Total 186 198
PT Solusi Tunas Pratama    
Obligations under finance leases    
Total 181 212
PT Putra Arga Binangun    
Obligations under finance leases    
Total 159 189
PT Mitsubishi UFJ Lease and Finance Indonesia    
Obligations under finance leases    
Total 103 135
PT Bali Towerindo Sentra    
Obligations under finance leases    
Total 86 100
Others (each below Rp75 billion)    
Obligations under finance leases    
Total Rp 411 Rp 557