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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance $ 283,694   $ 288,914  
Depreciation expenses (26,989)   (26,930) $ (27,461)
Additions 25,195   23,164 27,979
Disposal (307)   (86) (122)
Impairment losses 0 $ 0 93 0
Ending balance $ 281,416 $ 10,022 283,694 288,914
Carrying Amount [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     940,891 946,460
Additions       27,979
Disposal       (33,350)
Effect of foreign exchange differences       60
Others       (258)
Ending balance       940,891
Accumulated depreciation, amortization and impairment [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     (651,977) (657,752)
Depreciation expenses       (27,461)
Disposal       33,228
Effect of foreign exchange differences       (20)
Others       28
Ending balance       (651,977)
Land [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     103,972  
Ending balance       103,972
Land [Member] | Carrying Amount [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     103,972 104,079
Additions       0
Disposal       (71)
Effect of foreign exchange differences       0
Others       (36)
Ending balance       103,972
Land [Member] | Accumulated depreciation, amortization and impairment [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     0 0
Depreciation expenses       0
Disposal       0
Effect of foreign exchange differences       0
Others       0
Ending balance       0
Land improvements [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     263  
Ending balance       263
Land improvements [Member] | Carrying Amount [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     1,601 1,595
Additions       0
Disposal       0
Effect of foreign exchange differences       0
Others       6
Ending balance       1,601
Land improvements [Member] | Accumulated depreciation, amortization and impairment [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     (1,338) (1,293)
Depreciation expenses       (45)
Disposal       0
Effect of foreign exchange differences       0
Others       0
Ending balance       (1,338)
Buildings [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     44,784  
Ending balance       44,784
Buildings [Member] | Carrying Amount [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     72,911 72,694
Additions       21
Disposal       0
Effect of foreign exchange differences       0
Others       196
Ending balance       72,911
Buildings [Member] | Accumulated depreciation, amortization and impairment [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     (28,127) (26,799)
Depreciation expenses       (1,356)
Disposal       0
Effect of foreign exchange differences       0
Others       28
Ending balance       (28,127)
Computer equipment [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     2,115  
Ending balance       2,115
Computer equipment [Member] | Carrying Amount [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     14,258 14,162
Additions       52
Disposal       (643)
Effect of foreign exchange differences       0
Others       687
Ending balance       14,258
Computer equipment [Member] | Accumulated depreciation, amortization and impairment [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     (12,143) (11,788)
Depreciation expenses       (983)
Disposal       632
Effect of foreign exchange differences       0
Others       (4)
Ending balance       (12,143)
Telecommunications equipment [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     116,322  
Ending balance       116,322
Telecommunications equipment [Member] | Carrying Amount [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     715,748 722,054
Additions       159
Disposal       (31,984)
Effect of foreign exchange differences       60
Others       25,459
Ending balance       715,748
Telecommunications equipment [Member] | Accumulated depreciation, amortization and impairment [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     (599,426) (607,154)
Depreciation expenses       (24,236)
Disposal       31,952
Effect of foreign exchange differences       (20)
Others       32
Ending balance       (599,426)
Transportation equipment [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     231  
Ending balance       231
Transportation equipment [Member] | Carrying Amount [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     3,882 3,834
Additions       0
Disposal       (29)
Effect of foreign exchange differences       0
Others       77
Ending balance       3,882
Transportation equipment [Member] | Accumulated depreciation, amortization and impairment [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     (3,651) (3,513)
Depreciation expenses       (162)
Disposal       29
Effect of foreign exchange differences       0
Others       (5)
Ending balance       (3,651)
Miscellaneous equipment [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     2,582  
Ending balance       2,582
Miscellaneous equipment [Member] | Carrying Amount [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     9,874 9,515
Additions       334
Disposal       (623)
Effect of foreign exchange differences       0
Others       648
Ending balance       9,874
Miscellaneous equipment [Member] | Accumulated depreciation, amortization and impairment [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     (7,292) (7,205)
Depreciation expenses       (679)
Disposal       615
Effect of foreign exchange differences       0
Others       (23)
Ending balance       (7,292)
Construction in progress and equipment to be accepted [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     18,645  
Ending balance       18,645
Construction in progress and equipment to be accepted [Member] | Carrying Amount [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     18,645 18,527
Additions       27,413
Disposal       0
Effect of foreign exchange differences       0
Others       (27,295)
Ending balance       18,645
Construction in progress and equipment to be accepted [Member] | Accumulated depreciation, amortization and impairment [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     $ 0 0
Depreciation expenses       0
Disposal       0
Effect of foreign exchange differences       0
Others       0
Ending balance       $ 0