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Property, Plant and Equipment - Summary of Property, Plant and Equipment - Assets Subject to Operating Leases (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 Property Plant And Equipment [Line Items]        
Beginning balance $ 292,338      
Depreciation expenses (28,707)   $ (28,839) $ (28,760)
Impairment losses 0 $ 0 299 0
Ending balance 289,840 $ 8,839 292,338  
Property, plant and equipment subject to operating leases [member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance 7,253   6,199  
Ending balance 5,125   7,253 6,199
Gross carrying amount [Member] | Property, plant and equipment subject to operating leases [member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance 9,055   7,561 8,943
Additions 1   4 0
Others (2,214)   1,490 (1,382)
Ending balance 6,842   9,055 7,561
Accumulated depreciation, amortization and impairment [Member] | Property, plant and equipment subject to operating leases [member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance (1,802)   (1,362) (1,692)
Depreciation expenses (65)   (73) (59)
Others 150   (367) 389
Ending balance (1,717)   (1,802) (1,362)
Land [Member] | Property, plant and equipment subject to operating leases [member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance 4,924   4,376  
Ending balance 3,104   4,924 4,376
Land [Member] | Gross carrying amount [Member] | Property, plant and equipment subject to operating leases [member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance 4,924   4,376 4,809
Additions 0   0 0
Others (1,820)   548 (433)
Ending balance 3,104   4,924 4,376
Land [Member] | Accumulated depreciation, amortization and impairment [Member] | Property, plant and equipment subject to operating leases [member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance 0   0 0
Depreciation expenses 0   0 0
Others 0   0 0
Ending balance 0   0 0
Buildings [Member] | Property, plant and equipment subject to operating leases [member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance 2,329   1,823  
Ending balance 2,021   2,329 1,823
Buildings [Member] | Gross carrying amount [Member] | Property, plant and equipment subject to operating leases [member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance 4,131   3,185 4,134
Additions 1   4 0
Others (394)   942 (949)
Ending balance 3,738   4,131 3,185
Buildings [Member] | Accumulated depreciation, amortization and impairment [Member] | Property, plant and equipment subject to operating leases [member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance (1,802)   (1,362) (1,692)
Depreciation expenses (65)   (73) (59)
Others 150   (367) 389
Ending balance $ (1,717)   $ (1,802) $ (1,362)