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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, 2023
TWD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2021
TWD ($)
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance $ 291,528      
Depreciation expenses (28,839)   $ (28,760) $ (27,805)
Additions 30,398   31,265 35,613
Impairment losses 299 $ 10 0 0
Ending balance 292,338 $ 9,547 291,528  
Property, plant and equipment subject to operating leases [member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance 6,199   7,251  
Ending balance 7,253   6,199 7,251
Gross carrying amount [Member] | Property, plant and equipment subject to operating leases [member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance 7,561   8,943 9,209
Additions 4   0  
Others 1,490   (1,382) (266)
Ending balance 9,055   7,561 8,943
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 (1,362)   (1,692) (1,616)
Depreciation expenses (73)   (59) (77)
Others (367)   389 1
Ending balance (1,802)   (1,362) (1,692)
Land [Member] | Property, plant and equipment subject to operating leases [member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance 4,376   4,809  
Ending balance 4,924   4,376 4,809
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 4,376   4,809 4,973
Additions 0   0  
Others 548   (433) (164)
Ending balance 4,924   4,376 4,809
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 1,823   2,442  
Ending balance 2,329   1,823 2,442
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 3,185   4,134 4,236
Additions 4   0  
Others 942   (949) (102)
Ending balance 4,131   3,185 4,134
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 (1,362)   (1,692) (1,616)
Depreciation expenses (73)   (59) (77)
Others (367)   389 1
Ending balance $ (1,802)   $ (1,362) $ (1,692)