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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Pension benefit cost (Details) - IDR (Rp)
Rp in Billions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Mar. 01, 2003
Feb. 28, 2003
Disclosure of net defined benefit liability (asset) [line items]        
Pension benefit obligations at beginning of year Rp 9,717 Rp 10,816    
Service costs 504 353    
Interest income 607 696    
Return on plan assets (excluding amount included in net interest expense) 82 720    
Employer's contributions 719 226    
Actuarial losses recognized in OCI 1,536 2,045    
Pension benefits paid (291)      
Benefits paid by employer (719) (226)    
Pension benefit obligations at end of year Rp 8,509 Rp 9,717    
Funded pension | The company        
Disclosure of net defined benefit liability (asset) [line items]        
Percentage of participating employees contribution     18.00% 8.40%