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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Plan Details (Details) - IDR (Rp)
Rp in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of defined benefit plans [line items]    
Employer's contributions Rp (205,000) Rp (233,000)
The company | Funded pension    
Disclosure of defined benefit plans [line items]    
Percentage of companies share in total plan assets 1.73% 1.75%
Percentage of Debt Instruments Contributed to Fair Value of Plan Assets 1.80% 1.73%
Actual return on plan asset Rp 1,121,000 Rp 1,858,000
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 2,338,000 1,057,000
Net periodic pension benefit cost 562,000 398,000
Employer's contributions (205,000) (233,000)
Actuarial losses recognised in OCI 2,741,000 1,514,000
Return on plan assets (excluding amount included in net interest expense) 201,000 (398,000)
Benefits paid by employer (80,000)  
Projected pension benefit obligations at end of year 5,557,000 2,338,000
The company | Funded pension | Series B shares    
Disclosure of defined benefit plans [line items]    
Equity instruments 338,000 346,000
The company | Funded pension | Corporate bonds    
Disclosure of defined benefit plans [line items]    
Debt instruments 352,000 Rp 341,000
The company | Retired before end of June 2002    
Disclosure of defined benefit plans [line items]    
Maximum monthly pension benefits, settlements made Rp 80,000