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FINANCIAL INSTRUMENTS - Reconciliation (Details)
$ in Millions, Rp in Billions
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
IDR (Rp)
Dec. 31, 2019
IDR (Rp)
Disclosure of fair value measurement of assets [line items]      
Assets at beginning of period   Rp 235,057  
Assets at end of period $ 17,500 245,873 Rp 235,057
Level 3      
Disclosure of fair value measurement of assets [line items]      
Assets at beginning of period   1,346 922
Profit or loss   126 279
Other comprehensive income   3 9
Purchase/addition   711 389
Settlement/deduction   (224) (253)
Assets at end of period   Rp 1,962 Rp 1,346