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Intangible Assets - Summary of Intangible Assets (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
TWD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2021
TWD ($)
Disclosure of detailed information about intangible assets [Line Items]        
Beginning balance $ 79,187      
Amortization expenses (6,699)   $ (6,643) $ (6,569)
Impairment losses 0 $ 0 (9) (29)
Ending balance 72,727 $ 2,375 79,187  
Gross carrying amount [Member]        
Disclosure of detailed information about intangible assets [Line Items]        
Beginning balance 113,474   112,245 112,341
Additions-acquired separately 237   1,893 256
Disposal (505)   (665) (354)
Effect of foreign exchange differences 0   0 0
Others 3   1 2
Ending balance 113,209   113,474 112,245
Accumulated depreciation, amortization and impairment [Member]        
Disclosure of detailed information about intangible assets [Line Items]        
Beginning balance (34,287)   (28,300) (22,056)
Amortization expenses (6,699)   (6,643) (6,569)
Disposal 505   665 354
Impairment losses (336)   (9) (29)
Effect of foreign exchange differences (1)   0 0
Others 0   0 0
Ending balance (40,482)   (34,287) (28,300)
Beginning balance, net 79,187   83,945  
Ending balance, net 72,727   79,187 83,945
Mobile Broadband Concession [Member]        
Disclosure of detailed information about intangible assets [Line Items]        
Beginning balance 78,150      
Ending balance 71,761   78,150  
Mobile Broadband Concession [Member] | Gross carrying amount [Member]        
Disclosure of detailed information about intangible assets [Line Items]        
Beginning balance 109,963   108,338 108,338
Additions-acquired separately 0   1,625 0
Disposal 0   0 0
Effect of foreign exchange differences 0   0 0
Others 0   0 0
Ending balance 109,963   109,963 108,338
Mobile Broadband Concession [Member] | Accumulated depreciation, amortization and impairment [Member]        
Disclosure of detailed information about intangible assets [Line Items]        
Beginning balance (31,813)   (25,518) (19,319)
Amortization expenses (6,389)   (6,295) (6,199)
Disposal 0   0 0
Impairment losses     0 0
Effect of foreign exchange differences 0   0 0
Others 0   0 0
Ending balance (38,202)   (31,813) (25,518)
Beginning balance, net 78,150   82,820  
Ending balance, net 71,761   78,150 82,820
Computer software [Member]        
Disclosure of detailed information about intangible assets [Line Items]        
Beginning balance 622      
Ending balance 579   622  
Computer software [Member] | Gross carrying amount [Member]        
Disclosure of detailed information about intangible assets [Line Items]        
Beginning balance 2,798   3,203 3,320
Additions-acquired separately 231   257 225
Disposal (499)   (663) (344)
Effect of foreign exchange differences 0   0 0
Others 3   1 2
Ending balance 2,533   2,798 3,203
Computer software [Member] | Accumulated depreciation, amortization and impairment [Member]        
Disclosure of detailed information about intangible assets [Line Items]        
Beginning balance (2,176)   (2,530) (2,532)
Amortization expenses (276)   (310) (341)
Disposal 499   664 343
Impairment losses     0 0
Effect of foreign exchange differences (1)   0 0
Others 0   0 0
Ending balance (1,954)   (2,176) (2,530)
Beginning balance, net 622   673  
Ending balance, net 579   622 673
Goodwill [Member]        
Disclosure of detailed information about intangible assets [Line Items]        
Beginning balance 217      
Ending balance 217   217  
Goodwill [Member] | Gross carrying amount [Member]        
Disclosure of detailed information about intangible assets [Line Items]        
Beginning balance 291   291 291
Additions-acquired separately 0   0 0
Disposal 0   0 0
Effect of foreign exchange differences 0   0 0
Others 0   0 0
Ending balance 291   291 291
Goodwill [Member] | Accumulated depreciation, amortization and impairment [Member]        
Disclosure of detailed information about intangible assets [Line Items]        
Beginning balance (74)   (74) (45)
Amortization expenses 0   0 0
Disposal 0   0 0
Impairment losses     0 (29)
Effect of foreign exchange differences 0   0 0
Others 0   0 0
Ending balance (74)   (74) (74)
Beginning balance, net 217   217  
Ending balance, net 217   217 217
Others [Member]        
Disclosure of detailed information about intangible assets [Line Items]        
Beginning balance 198      
Ending balance 170   198  
Others [Member] | Gross carrying amount [Member]        
Disclosure of detailed information about intangible assets [Line Items]        
Beginning balance 422   413 392
Additions-acquired separately 6   11 31
Disposal (6)   (2) (10)
Effect of foreign exchange differences 0   0 0
Others 0   0 0
Ending balance 422   422 413
Others [Member] | Accumulated depreciation, amortization and impairment [Member]        
Disclosure of detailed information about intangible assets [Line Items]        
Beginning balance (224)   (178) (160)
Amortization expenses (34)   (38) (29)
Disposal 6   1 11
Impairment losses     (9) 0
Effect of foreign exchange differences 0   0 0
Others 0   0 0
Ending balance (252)   (224) (178)
Beginning balance, net 198   235  
Ending balance, net $ 170   $ 198 $ 235