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Intangible Assets - Summary of Intangible Assets (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Disclosure of detailed information about intangible assets [Line Items]        
Beginning balance $ 72,727      
Amortization expenses (6,699)   $ (6,699) $ (6,643)
Impairment losses 0 $ 0 0 (9)
Ending balance 66,283 $ 2,021 72,727  
Gross carrying amount [Member]        
Disclosure of detailed information about intangible assets [Line Items]        
Beginning balance 113,209   113,474 112,245
Additions-acquired separately 234   237 1,893
Disposal (366)   (505) (665)
Effect of foreign exchange differences 0   0 0
Others 24   3 1
Ending balance 113,101   113,209 113,474
Accumulated depreciation, amortization and impairment [Member]        
Disclosure of detailed information about intangible assets [Line Items]        
Beginning balance (40,482)   (34,287) (28,300)
Amortization expenses (6,699)   (6,699) (6,643)
Disposal 366   505 665
Impairment losses     (336) (9)
Effect of foreign exchange differences 0   (1) 0
Others (3)   0 0
Ending balance (46,818)   (40,482) (34,287)
Beginning balance, net 72,727   79,187  
Ending balance, net 66,283   72,727 79,187
Mobile Broadband Concession [Member]        
Disclosure of detailed information about intangible assets [Line Items]        
Beginning balance 71,761      
Ending balance 65,371   71,761  
Mobile Broadband Concession [Member] | Gross carrying amount [Member]        
Disclosure of detailed information about intangible assets [Line Items]        
Beginning balance 109,963   109,963 108,338
Additions-acquired separately 0   0 1,625
Disposal 0   0 0
Effect of foreign exchange differences 0   0 0
Others 0   0 0
Ending balance 109,963   109,963 109,963
Mobile Broadband Concession [Member] | Accumulated depreciation, amortization and impairment [Member]        
Disclosure of detailed information about intangible assets [Line Items]        
Beginning balance (38,202)   (31,813) (25,518)
Amortization expenses (6,390)   (6,389) (6,295)
Disposal 0   0 0
Impairment losses       0
Effect of foreign exchange differences 0   0 0
Others 0   0 0
Ending balance (44,592)   (38,202) (31,813)
Beginning balance, net 71,761   78,150  
Ending balance, net 65,371   71,761 78,150
Computer software [Member]        
Disclosure of detailed information about intangible assets [Line Items]        
Beginning balance 579      
Ending balance 551   579  
Computer software [Member] | Gross carrying amount [Member]        
Disclosure of detailed information about intangible assets [Line Items]        
Beginning balance 2,533   2,798 3,203
Additions-acquired separately 229   231 257
Disposal (358)   (499) (663)
Effect of foreign exchange differences 0   0 0
Others 24   3 1
Ending balance 2,428   2,533 2,798
Computer software [Member] | Accumulated depreciation, amortization and impairment [Member]        
Disclosure of detailed information about intangible assets [Line Items]        
Beginning balance (1,954)   (2,176) (2,530)
Amortization expenses (278)   (276) (310)
Disposal 358   499 664
Impairment losses       0
Effect of foreign exchange differences 0   (1) 0
Others (3)   0 0
Ending balance (1,877)   (1,954) (2,176)
Beginning balance, net 579   622  
Ending balance, net 551   579 622
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) (74)
Amortization expenses 0   0 0
Disposal 0   0 0
Impairment losses       0
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 170      
Ending balance 144   170  
Others [Member] | Gross carrying amount [Member]        
Disclosure of detailed information about intangible assets [Line Items]        
Beginning balance 422   422 413
Additions-acquired separately 5   6 11
Disposal (8)   (6) (2)
Effect of foreign exchange differences 0   0 0
Others 0   0 0
Ending balance 419   422 422
Others [Member] | Accumulated depreciation, amortization and impairment [Member]        
Disclosure of detailed information about intangible assets [Line Items]        
Beginning balance (252)   (224) (178)
Amortization expenses (31)   (34) (38)
Disposal 8   6 1
Impairment losses       (9)
Effect of foreign exchange differences 0   0 0
Others     0 0
Ending balance (275)   (252) (224)
Beginning balance, net 170   198  
Ending balance, net $ 144   $ 170 $ 198