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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Schedule of changes in projected pension benefit obligations and plan assets of pension plan (Details) - IDR (Rp)
Rp in Billions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
PENSION AND OTHER POST-EMPLOYMENT BENEFITS      
Pension benefit obligations at beginning of year Rp 9,717 Rp 10,816  
Service costs 504 353  
Interest costs and interest income from assets 607 696  
Cost recognized in the consolidated statement of profit or loss 1,403 1,357  
Changes in asset ceiling excluding amount in net interest 84    
Actuarial (gain) losses (1,536) (2,045)  
Benefits paid by employer (65) (185)  
Pension benefit obligations at end of year 8,509 9,717 Rp 10,816
The company | Additional pension benefit obligation      
PENSION AND OTHER POST-EMPLOYMENT BENEFITS      
Service costs 37    
Cost recognized in the consolidated statement of profit or loss 37    
Plan assets   6  
Changes in asset ceiling excluding amount in net interest   (6)  
Actuarial (gain) losses 7    
Pension benefit obligations at end of year 44    
The company | Other post-employment benefit cost      
PENSION AND OTHER POST-EMPLOYMENT BENEFITS      
Pension benefit obligations at beginning of year 300 367 366
Service costs 8 7 4
Interest costs and interest income from assets 17 16 19
Past service cost - plan amendments     58
Cost recognized in the consolidated statement of profit or loss 25 23 81
Actuarial (gain) losses (14) (2) 15
Benefits paid by employer (43) (88) (95)
Pension benefit obligations at end of year 268 300 367
The company | Long Service Employee Benefit      
PENSION AND OTHER POST-EMPLOYMENT BENEFITS      
Pension benefit obligations at beginning of year 4 1  
Service costs 1 3 53
Cost recognized in the consolidated statement of profit or loss 1 3 53
Actuarial (gain) losses     (52)
Benefits paid by employer (4)    
Pension benefit obligations at end of year 1 4 1
The company | Unfunded | Pension defined benefit plans [member]      
PENSION AND OTHER POST-EMPLOYMENT BENEFITS      
Pension benefit obligations at beginning of year 613 962 1,479
Service costs 24 25 28
Interest costs and interest income from assets 34 49 89
Cost recognized in the consolidated statement of profit or loss 58 74 117
Actuarial (gain) losses (55) (82) (89)
Benefits paid by employer (94) (341) (545)
Pension benefit obligations at end of year 522 613 962
The company and its subsidiaries      
PENSION AND OTHER POST-EMPLOYMENT BENEFITS      
Pension benefit obligations at beginning of year 1,843 2,107 2,535
Service costs 148 289 343
Interest costs and interest income from assets 51 65 108
Past service cost - plan amendments     58
Cost recognized in the consolidated statement of profit or loss 199 354 509
Plan assets   6  
Changes in asset ceiling excluding amount in net interest   (6)  
Actuarial (gain) losses (75) (126) (1)
Benefits paid by employer (204) (492) (936)
Pension benefit obligations at end of year 1,763 1,843 2,107
The company and its subsidiaries | Obligation under the Labor Law      
PENSION AND OTHER POST-EMPLOYMENT BENEFITS      
Pension benefit obligations at beginning of year 926 777 690
Service costs 78 254 258
Cost recognized in the consolidated statement of profit or loss 78 254 258
Actuarial (gain) losses (13) (42) 125
Benefits paid by employer (63) (63) (296)
Pension benefit obligations at end of year Rp 928 Rp 926 Rp 777