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SIGNIFICANT COMMITMENTS AND AGREEMENTS - Radio Frequency Usage (Details) - IDR (Rp)
Rp in Billions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Significant Commitments and Agreements [Line Items]      
Radio frequency usage charges Rp 5,930 Rp 5,736 Rp 5,473
Telkomsel      
Disclosure of Significant Commitments and Agreements [Line Items]      
Period for radio frequency usage 10 years    
Amount of performance bond Rp 20    
Amount of surety bond Rp 1,030