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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, 2024
Dec. 31, 2023
PENSION AND OTHER POST-EMPLOYMENT BENEFITS    
Pension benefit obligations at beginning of year Rp 9,862 Rp 8,509
Service costs 625 657
Interest costs 645 595
Transferred employees costs (1)  
Cost recognized in the consolidated statement of profit or loss 1,486 1,492
Actuarial (gain) loss recognized in OCI (694) 1,698
Benefits paid by employer (34) (50)
Effect on transfer of IndiHome business to Telkomsel   (61)
Pension benefit obligations at end of year 10,043 9,862
The Company | Additional pension benefit obligation    
PENSION AND OTHER POST-EMPLOYMENT BENEFITS    
Pension benefit obligations at beginning of year 44 44
Service costs 0  
Interest costs 3 3
Transferred employees costs 0  
Cost recognized in the consolidated statement of profit or loss 3 3
Actuarial (gain) loss recognized in OCI (1) (1)
Benefits paid by employer (4) (2)
Effect on transfer of IndiHome business to Telkomsel   0
Pension benefit obligations at end of year 42 44
The Company | Other post-employment benefit cost    
PENSION AND OTHER POST-EMPLOYMENT BENEFITS    
Pension benefit obligations at beginning of year 244 268
Service costs 6 7
Past service costs 1  
Interest costs 13 15
Transferred employees costs 0  
Early retirement settlement costs 0  
Cost recognized in the consolidated statement of profit or loss 20 22
Actuarial (gain) loss recognized in OCI (6) 2
Benefits paid by employer (83) (38)
Effect on transfer of IndiHome business to Telkomsel   (10)
Pension benefit obligations at end of year 175 244
The Company | Long Service Employee Benefit    
PENSION AND OTHER POST-EMPLOYMENT BENEFITS    
Pension benefit obligations at beginning of year 1 1
Service costs 0 1
Early retirement settlement costs 0  
Cost recognized in the consolidated statement of profit or loss   1
Actuarial (gain) loss recognized in OCI 0  
Benefits paid by employer   (1)
Pension benefit obligations at end of year 1 1
The Company | Unfunded | Pension defined benefit plans [member]    
PENSION AND OTHER POST-EMPLOYMENT BENEFITS    
Pension benefit obligations at beginning of year 258 522
Service costs 9 22
Interest costs 14 32
Transferred employees costs 0  
Early retirement settlement costs (50)  
Cost recognized in the consolidated statement of profit or loss (27) 54
Actuarial (gain) loss recognized in OCI 53 (246)
Benefits paid by employer (69) (53)
Effect on transfer of IndiHome business to Telkomsel   (19)
Pension benefit obligations at end of year 215 258
The company and its subsidiaries    
PENSION AND OTHER POST-EMPLOYMENT BENEFITS    
Pension benefit obligations at beginning of year 1,552 1,763
Service costs 219 182
Past service costs 19  
Interest costs 40 115
Early retirement settlement costs (50)  
Cost recognized in the consolidated statement of profit or loss 228 297
Actuarial (gain) loss recognized in OCI (61) (286)
Benefits paid by employer (218) (196)
Effect on transfer of IndiHome business to Telkomsel   (26)
Divestment (4)  
Pension benefit obligations at end of year 1,497 1,552
The company and its subsidiaries | Obligation under the Labor Law    
PENSION AND OTHER POST-EMPLOYMENT BENEFITS    
Pension benefit obligations at beginning of year 1,005 928
Service costs 204 152
Past service costs 18  
Interest costs 10 65
Transferred employees costs 0  
Early retirement settlement costs 0  
Cost recognized in the consolidated statement of profit or loss 232 217
Actuarial (gain) loss recognized in OCI (107) (41)
Benefits paid by employer (62) (102)
Effect on transfer of IndiHome business to Telkomsel   3
Divestment (4)  
Pension benefit obligations at end of year Rp 1,064 Rp 1,005