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Intangible Assets - Summary of Intangible Assets (Detail)
$ in Millions, $ in Millions
 1 Months Ended 12 Months Ended
Feb. 29, 2020
TWD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Disclosure of detailed information about intangible assets [Line Items]          
Beginning balance   $ 47,047   $ 50,944  
Additions-acquired separately $ 48,373        
Amortization expenses   (5,424)   (4,253) $ (4,386)
Impairment losses   (9) $ 0 (9) (51)
Ending balance   90,285 $ 3,214 47,047 50,944
Carrying Amount [Member]          
Disclosure of detailed information about intangible assets [Line Items]          
Beginning balance   64,009   74,179 74,110
Additions-acquired separately   48,605   363 498
Disposal   (341)   (10,535) (429)
Effect of foreign exchange difference   0   0 0
Acquired by business combinations   67      
Others   1   2  
Ending balance   112,341   64,009 74,179
Accumulated depreciation, amortization and impairment [Member]          
Disclosure of detailed information about intangible assets [Line Items]          
Beginning balance   (16,962)   (23,235) (19,227)
Amortization expenses   (5,424)   (4,253) (4,386)
Disposal   339   10,535 429
Impairment losses   (9)   (9) (51)
Effect of foreign exchange difference   0   0 0
Acquired by business combinations   0      
Ending balance   (22,056)   (16,962) (23,235)
Mobile Broadband Concession [Member]          
Disclosure of detailed information about intangible assets [Line Items]          
Beginning balance   45,672   49,512  
Ending balance   89,019   45,672 49,512
Mobile Broadband Concession [Member] | Carrying Amount [Member]          
Disclosure of detailed information about intangible assets [Line Items]          
Beginning balance   59,965   70,144 70,144
Additions-acquired separately   48,373   0 0
Disposal   0   (10,179) 0
Effect of foreign exchange difference   0   0 0
Acquired by business combinations   0      
Others   0   0  
Ending balance   108,338   59,965 70,144
Mobile Broadband Concession [Member] | Accumulated depreciation, amortization and impairment [Member]          
Disclosure of detailed information about intangible assets [Line Items]          
Beginning balance   (14,293)   (20,632) (16,675)
Amortization expenses   (5,026)   (3,840) (3,957)
Disposal   0   10,179 0
Impairment losses   0   0 0
Effect of foreign exchange difference   0   0 0
Acquired by business combinations   0      
Ending balance   (19,319)   (14,293) (20,632)
Computer software [Member]          
Disclosure of detailed information about intangible assets [Line Items]          
Beginning balance   931   959  
Ending balance   788   931 959
Computer software [Member] | Carrying Amount [Member]          
Disclosure of detailed information about intangible assets [Line Items]          
Beginning balance   3,430   3,426 3,312
Additions-acquired separately   226   358 485
Disposal   (338)   (356) (371)
Effect of foreign exchange difference   0   0 0
Acquired by business combinations   1      
Others   1   2  
Ending balance   3,320   3,430 3,426
Computer software [Member] | Accumulated depreciation, amortization and impairment [Member]          
Disclosure of detailed information about intangible assets [Line Items]          
Beginning balance   (2,499)   (2,467) (2,432)
Amortization expenses   (371)   (388) (406)
Disposal   338   356 371
Impairment losses   0   0 0
Effect of foreign exchange difference   0   0 0
Acquired by business combinations   0      
Ending balance   (2,532)   (2,499) (2,467)
Goodwill [Member]          
Disclosure of detailed information about intangible assets [Line Items]          
Beginning balance   200   209  
Ending balance   246   200 209
Goodwill [Member] | Carrying Amount [Member]          
Disclosure of detailed information about intangible assets [Line Items]          
Beginning balance   236   236 236
Additions-acquired separately   0   0 0
Disposal   0   0 0
Effect of foreign exchange difference   0   0 0
Acquired by business combinations   55      
Others   0   0  
Ending balance   291   236 236
Goodwill [Member] | Accumulated depreciation, amortization and impairment [Member]          
Disclosure of detailed information about intangible assets [Line Items]          
Beginning balance   (36)   (27) (27)
Amortization expenses   0   0 0
Disposal   0   0 0
Impairment losses   (9)   (9) 0
Effect of foreign exchange difference   0   0 0
Acquired by business combinations   0      
Ending balance   (45)   (36) (27)
Others [Member]          
Disclosure of detailed information about intangible assets [Line Items]          
Beginning balance   244   264  
Ending balance   232   244 264
Others [Member] | Carrying Amount [Member]          
Disclosure of detailed information about intangible assets [Line Items]          
Beginning balance   378   373 418
Additions-acquired separately   6   5 13
Disposal   (3)   0 (58)
Effect of foreign exchange difference   0   0 0
Acquired by business combinations   11      
Others   0   0  
Ending balance   392   378 373
Others [Member] | Accumulated depreciation, amortization and impairment [Member]          
Disclosure of detailed information about intangible assets [Line Items]          
Beginning balance   (134)   (109) (93)
Amortization expenses   (27)   (25) (23)
Disposal   1   0 58
Impairment losses   0   0 (51)
Effect of foreign exchange difference   0   0 0
Acquired by business combinations   0      
Ending balance   $ (160)   $ (134) $ (109)