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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Post-employment health care benefit cost - Plan Assets (Details) - IDR (Rp)
Rp in Billions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Corporate obligations    
Disclosure of fair value of plan assets [line items]    
Fixed income instruments Rp 69 Rp 6
Percentage of companies share in total plan assets 0.55% 0.04%
Post-employment health care benefit cost    
Disclosure of fair value of plan assets [line items]    
Percentage of companies share in total plan assets 1.72% 2.45%
Actual return on plan asset Rp 270 Rp 987
Post-employment health care benefit cost | Level 1    
Disclosure of fair value of plan assets [line items]    
Cash and cash equivalents 375 392
Equity-based mutual fund 313 435
Total 12,118 12,730
Post-employment health care benefit cost | Unquoted    
Disclosure of fair value of plan assets [line items]    
Private placement 507 448
Total 507 448
Post-employment health care benefit cost | Financials | Level 1    
Disclosure of fair value of plan assets [line items]    
Equity instruments 1,070 1,468
Post-employment health care benefit cost | Consumer non-cyclicals | Level 1    
Disclosure of fair value of plan assets [line items]    
Equity instruments 78 115
Post-employment health care benefit cost | Basic material | Level 1    
Disclosure of fair value of plan assets [line items]    
Equity instruments 197 260
Post-employment health care benefit cost | Infrastructure | Level 1    
Disclosure of fair value of plan assets [line items]    
Equity instruments 517 618
Post-employment health care benefit cost | Energy | Level 1    
Disclosure of fair value of plan assets [line items]    
Equity instruments 164 156
Post-employment health care benefit cost | Technology | Level 1    
Disclosure of fair value of plan assets [line items]    
Equity instruments 43 24
Post-employment health care benefit cost | Industrials | Level 1    
Disclosure of fair value of plan assets [line items]    
Equity instruments 242 261
Post-employment health care benefit cost | Consumer cyclicals | Level 1    
Disclosure of fair value of plan assets [line items]    
Equity instruments 355 395
Post-employment health care benefit cost | Properties and real estate | Level 1    
Disclosure of fair value of plan assets [line items]    
Equity instruments 96 110
Post-employment health care benefit cost | Healthcare | Level 1    
Disclosure of fair value of plan assets [line items]    
Equity instruments 118 147
Post-employment health care benefit cost | Transportation and logistic | Level 1    
Disclosure of fair value of plan assets [line items]    
Equity instruments 4 5
Post-employment health care benefit cost | Government obligations | Level 1    
Disclosure of fair value of plan assets [line items]    
Fixed income instruments 1,837 1,271
Post-employment health care benefit cost | Corporate obligations | Level 1    
Disclosure of fair value of plan assets [line items]    
Fixed income instruments 196 6
Post-employment health care benefit cost | Fixed income mutual funds | Level 1    
Disclosure of fair value of plan assets [line items]    
Fixed income instruments 6,484 7,067
Post-employment health care benefit cost | Exchange Traded Fund ("ETF") | Level 1    
Disclosure of fair value of plan assets [line items]    
Fixed income instruments 24  
Post-employment health care benefit cost | Index mutual funds | Level 1    
Disclosure of fair value of plan assets [line items]    
Fixed income instruments 5  
Series B shares | Post-employment health care benefit cost    
Disclosure of fair value of plan assets [line items]    
Equity instruments Rp 217 Rp 321