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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 ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Disclosure of detailed information about intangible assets [Line Items]          
Beginning balance   $ 90,285      
Additions-acquired separately $ 48,373        
Amortization expenses   (6,569)   $ (5,424) $ (4,253)
Impairment losses   (29) $ (1) (9) (9)
Ending balance   83,945 $ 3,026 90,285  
Gross carrying amount [Member]          
Disclosure of detailed information about intangible assets [Line Items]          
Beginning balance   112,341   64,009 74,179
Additions-acquired separately   256   48,605 363
Disposal   (354)   (341) (10,535)
Effect of foreign exchange differences   0   0 0
Acquired by business combinations       67  
Others   2   1 2
Ending balance   112,245   112,341 64,009
Accumulated depreciation, amortization and impairment [Member]          
Disclosure of detailed information about intangible assets [Line Items]          
Beginning balance   (22,056)   (16,962) (23,235)
Amortization expenses   (6,569)   (5,424) (4,253)
Disposal   354   339 10,535
Impairment losses   (29)   (9) (9)
Effect of foreign exchange differences   0   0 0
Acquired by business combinations       0  
Others   0      
Ending balance   (28,300)   (22,056) (16,962)
Beginning balance, net   90,285   47,047 50,944
Ending balance, net   83,945   90,285 47,047
Mobile Broadband Concession [Member]          
Disclosure of detailed information about intangible assets [Line Items]          
Beginning balance   89,019      
Ending balance   82,820   89,019  
Mobile Broadband Concession [Member] | Gross carrying amount [Member]          
Disclosure of detailed information about intangible assets [Line Items]          
Beginning balance   108,338   59,965 70,144
Additions-acquired separately   0   48,373 0
Disposal   0   0 (10,179)
Effect of foreign exchange differences   0   0 0
Acquired by business combinations       0  
Others   0   0 0
Ending balance   108,338   108,338 59,965
Mobile Broadband Concession [Member] | Accumulated depreciation, amortization and impairment [Member]          
Disclosure of detailed information about intangible assets [Line Items]          
Beginning balance   (19,319)   (14,293) (20,632)
Amortization expenses   (6,199)   (5,026) (3,840)
Disposal   0   0 10,179
Impairment losses   0   0 0
Effect of foreign exchange differences   0   0 0
Acquired by business combinations       0  
Others   0      
Ending balance   (25,518)   (19,319) (14,293)
Beginning balance, net   89,019   45,672 49,512
Ending balance, net   82,820   89,019 45,672
Computer software [Member]          
Disclosure of detailed information about intangible assets [Line Items]          
Beginning balance   788      
Ending balance   673   788  
Computer software [Member] | Gross carrying amount [Member]          
Disclosure of detailed information about intangible assets [Line Items]          
Beginning balance   3,320   3,430 3,426
Additions-acquired separately   225   226 358
Disposal   (344)   (338) (356)
Effect of foreign exchange differences   0   0 0
Acquired by business combinations       1  
Others   2   1 2
Ending balance   3,203   3,320 3,430
Computer software [Member] | Accumulated depreciation, amortization and impairment [Member]          
Disclosure of detailed information about intangible assets [Line Items]          
Beginning balance   (2,532)   (2,499) (2,467)
Amortization expenses   (341)   (371) (388)
Disposal   343   338 356
Impairment losses   0   0 0
Effect of foreign exchange differences   0   0 0
Acquired by business combinations       0  
Others   0      
Ending balance   (2,530)   (2,532) (2,499)
Beginning balance, net   788   931 959
Ending balance, net   673   788 931
Goodwill [Member]          
Disclosure of detailed information about intangible assets [Line Items]          
Beginning balance   246      
Ending balance   217   246  
Goodwill [Member] | Gross carrying amount [Member]          
Disclosure of detailed information about intangible assets [Line Items]          
Beginning balance   291   236 236
Additions-acquired separately   0   0 0
Disposal   0   0 0
Effect of foreign exchange differences   0   0 0
Acquired by business combinations       55  
Others   0   0 0
Ending balance   291   291 236
Goodwill [Member] | Accumulated depreciation, amortization and impairment [Member]          
Disclosure of detailed information about intangible assets [Line Items]          
Beginning balance   (45)   (36) (27)
Amortization expenses   0   0 0
Disposal   0   0 0
Impairment losses   (29)   (9) (9)
Effect of foreign exchange differences   0   0 0
Acquired by business combinations       0  
Others   0      
Ending balance   (74)   (45) (36)
Beginning balance, net   246   200 209
Ending balance, net   217   246 200
Others [Member]          
Disclosure of detailed information about intangible assets [Line Items]          
Beginning balance   232      
Ending balance   235   232  
Others [Member] | Gross carrying amount [Member]          
Disclosure of detailed information about intangible assets [Line Items]          
Beginning balance   392   378 373
Additions-acquired separately   31   6 5
Disposal   (10)   (3) 0
Effect of foreign exchange differences   0   0 0
Acquired by business combinations       11  
Others   0   0 0
Ending balance   413   392 378
Others [Member] | Accumulated depreciation, amortization and impairment [Member]          
Disclosure of detailed information about intangible assets [Line Items]          
Beginning balance   (160)   (134) (109)
Amortization expenses   (29)   (27) (25)
Disposal   11   1 0
Impairment losses   0   0 0
Effect of foreign exchange differences   0   0 0
Acquired by business combinations       0  
Others   0      
Ending balance   (178)   (160) (134)
Beginning balance, net   232   244 264
Ending balance, net   $ 235   $ 232 $ 244