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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Obligation under the Labor Law (Details) - IDR (Rp)
Rp in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of defined benefit plans [line items]      
Post-employment benefit expense, defined benefit plans Rp 1,600,000 Rp 2,080,000 Rp 1,361,000
Amount recognised in other comprehensive income before tax adjustment 5,418,000 (2,869,000) (2,266,000)
Other employee benefit cost      
Disclosure of defined benefit plans [line items]      
Net defined benefit liability (asset) 507,000 427,000  
Post-employment benefit expense, defined benefit plans 113,000 62,000 82,000
Amount recognised in other comprehensive income before tax adjustment Rp 14,000 Rp (72,000) Rp (33,000)