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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Plan Details (Details) - IDR (Rp)
Rp in Millions
 12 Months Ended
Jun. 07, 2017
Dec. 31, 2019
Dec. 31, 2018
Disclosure of defined benefit plans [line items]      
Employer's contributions   Rp (233,000)  
The company | Funded pension      
Disclosure of defined benefit plans [line items]      
Percentage of companies share in total plan assets   1.75% 1.95%
Percentage of Debt Instruments Contributed to Fair Value of Plan Assets   1.73% 1.65%
Actual return on plan asset   Rp 1,858,000 Rp (158,000)
Minimum FSR required for non contribution to fund   105.00%  
Funding sufficiency ratio   105.00%  
Projected pension benefit obligations (prepaid pension benefit cost) at beginning of year   Rp 1,057,000 1,540,000
Net periodic pension benefit cost   398,000 548,000
Provision of additional pension benefit     205,000
Employer's contributions   (233,000)  
Actuarial (gain) losses recognised in OCI   1,514,000 (2,691,000)
Return on plan assets (excluding amount included in net interest expense)   (398,000) 1,455,000
Projected pension benefit obligations at end of year   2,338,000 1,057,000
The company | Funded pension | Series B shares      
Disclosure of defined benefit plans [line items]      
Equity instruments   346,000 372,000
The company | Funded pension | Corporate bonds      
Disclosure of defined benefit plans [line items]      
Debt instruments   341,000 Rp 314,000
The company | Retired before end of June 2002 | Funded pension      
Disclosure of defined benefit plans [line items]      
One time benefits paid Rp 4,500    
The company | Retired starting from end of June 2002 until end of April 2017 | Funded pension      
Disclosure of defined benefit plans [line items]      
One time benefits paid   Rp 2,250