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FINANCIAL INSTRUMENTS - Reconciliation (Details)
$ in Millions, Rp in Billions
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
IDR (Rp)
Dec. 31, 2018
IDR (Rp)
Disclosure of fair value measurement of assets [line items]      
Assets at beginning of period   Rp 205,900  
Assets at end of period $ 16,931 235,057 Rp 205,900
Level 3      
Disclosure of fair value measurement of assets [line items]      
Assets at beginning of period   922 373
Profit or loss   279 146
Other comprehensive income   9  
Purchase/addition   389 438
Settlement/deduction   (253) (35)
Assets at end of period   Rp 1,346 Rp 922