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Investment Properties - Summary of Investment Properties (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 investment property [Line Items]        
Beginning balance $ 9,805      
Depreciation expense (45)   $ (45) $ (44)
Impairment loss 0 $ 0 0 (9)
Reversal of impairment loss 139     107
Ending balance 12,302 $ 375 9,805  
Gross carrying amount [Member]        
Disclosure of detailed information about investment property [Line Items]        
Beginning balance 11,162   10,780 10,663
Additions 4   54 18
Reclassification 2,427   328 99
Ending balance 13,593   11,162 10,780
Accumulated depreciation, amortization and impairment [Member]        
Disclosure of detailed information about investment property [Line Items]        
Beginning balance (1,357)   (976) (1,000)
Depreciation expense (45)   (45) (44)
Impairment loss     (336) (9)
Reversal of impairment loss 139     107
Reclassification (28)     (39)
Ending balance (1,291)   (1,357) (976)
Beginning balance, net 9,805   9,804  
Ending balance, net $ 12,302   $ 9,805 $ 9,804