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OPERATING SEGMENT (Details)
$ in Millions, Rp in Billions
 12 Months Ended
Dec. 31, 2020
USD ($)
segment
Dec. 31, 2020
IDR (Rp)
segment
Dec. 31, 2019
IDR (Rp)
Dec. 31, 2018
IDR (Rp)
Segment results        
Number of reportable segments | segment 4 4    
Number of operating segments aggregated to form reportable segments | segment 0 0    
External revenues   Rp 136,447 Rp 135,557 Rp 130,788
Total revenues $ 9,712 136,447 135,557 130,788
Segment expenses   (92,489) (91,563) (92,255)
OPERATING PROFIT $ 3,128 43,958 43,994 38,533
Capital expenditures   (29,279) (36,485) (33,620)
Depreciation and amortization   (28,925) (27,204) (21,442)
Provision recognised in current period   (2,344) (1,712) (2,079)
Operating Segments        
Segment results        
External revenues   136,126 135,110 130,497
Inter-segment revenue   40,725 38,337 41,729
Total revenues   176,851 173,447 172,226
Segment expenses   (133,264) (132,193) (130,520)
OPERATING PROFIT   43,587 41,254 41,706
Capital expenditures   (29,067) (36,086) (32,995)
Depreciation and amortization   (28,849) (23,287) (21,450)
Provision recognised in current period   (2,259) (2,293) (1,716)
Adjustments and Eliminations        
Segment results        
External revenues   321 447 291
Inter-segment revenue   (40,725) (38,337) (41,729)
Total revenues   (40,404) (37,890) (41,438)
Segment expenses   40,775 40,630 38,265
OPERATING PROFIT   371 2,740 (3,173)
Capital expenditures   (212) (399) (625)
Depreciation and amortization   (76) (3,917) 8
Provision recognised in current period   (85) 581 (363)
Mobile | Operating Segments        
Segment results        
External revenues   83,720 87,897 85,338
Inter-segment revenue   3,297 3,163 3,880
Total revenues   87,017 91,060 89,218
Segment expenses   (54,051) (56,864) (55,449)
OPERATING PROFIT   32,966 34,196 33,769
Capital expenditures   (9,520) (11,963) (14,373)
Depreciation and amortization   (16,945) (13,829) (13,095)
Provision recognised in current period   (83) (521) (438)
Consumer | Operating Segments        
Segment results        
External revenues   20,957 17,706 13,891
Inter-segment revenue   1,148 786 2,290
Total revenues   22,105 18,492 16,181
Segment expenses   (17,544) (15,904) (15,531)
OPERATING PROFIT   4,561 2,588 650
Capital expenditures   (9,770) (10,581) (6,958)
Depreciation and amortization   (3,925) (3,438) (3,060)
Provision recognised in current period   (511) (665) (438)
Enterprise | Operating Segments        
Segment results        
External revenues   17,729 18,701 21,054
Inter-segment revenue   18,591 16,834 17,995
Total revenues   36,320 35,535 39,049
Segment expenses   (36,864) (36,768) (37,833)
OPERATING PROFIT   (544) (1,233) 1,216
Capital expenditures   (5,178) (5,614) (5,325)
Depreciation and amortization   (3,208) (2,737) (2,128)
Provision recognised in current period   (1,390) (973) (764)
WIB | Operating Segments        
Segment results        
External revenues   13,501 10,609 10,084
Inter-segment revenue   16,139 16,265 16,678
Total revenues   29,640 26,874 26,762
Segment expenses   (23,143) (21,111) (20,634)
OPERATING PROFIT   6,497 5,763 6,128
Capital expenditures   (4,587) (7,907) (6,321)
Depreciation and amortization   (4,750) (3,262) (3,146)
Provision recognised in current period   (267) (121) (71)
Others (each below Rp75 billion)        
Segment results        
External revenues   219 197 130
Total revenues   518 631 428
Others (each below Rp75 billion) | Operating Segments        
Segment results        
External revenues   219 197 130
Inter-segment revenue   1,550 1,289 886
Total revenues   1,769 1,486 1,016
Segment expenses   (1,662) (1,546) (1,073)
OPERATING PROFIT   107 (60) (57)
Capital expenditures   (12) (21) (18)
Depreciation and amortization   (21) (21) (21)
Provision recognised in current period   Rp (8) Rp (13) Rp (5)