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FINANCIAL INSTRUMENTS - Credit risk (Details) - IDR (Rp)
Rp in Billions
Dec. 31, 2021
Dec. 31, 2020
FINANCIAL RISK MANAGEMENT    
Maximum credit exposure Rp 1,500  
Maximum share of total receivables held by any client (as a percent) 5.05%  
Credit risk    
FINANCIAL RISK MANAGEMENT    
Maximum credit exposure Rp 50,132 Rp 34,903
Credit risk | Cash and cash equivalents    
FINANCIAL RISK MANAGEMENT    
Maximum credit exposure 38,311 20,589
Credit risk | Trade and other receivables    
FINANCIAL RISK MANAGEMENT    
Maximum credit exposure 493 1,303
Credit risk | Contract assets    
FINANCIAL RISK MANAGEMENT    
Maximum credit exposure 8,705 11,554
Credit risk | Other current financial assets    
FINANCIAL RISK MANAGEMENT    
Maximum credit exposure 2,473 1,239
Credit risk | Other non-current financial assets    
FINANCIAL RISK MANAGEMENT    
Maximum credit exposure Rp 150 Rp 218