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Investment Properties - Summary of Investment Properties (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 investment property [Line Items]        
Beginning balance $ 9,804      
Depreciation expense (45)   $ (44) $ (42)
Impairment loss 0 $ 0 (9) (29)
Reversal of impairment loss     107 83
Ending balance 9,805 $ 320 9,804  
Gross carrying amount [Member]        
Disclosure of detailed information about investment property [Line Items]        
Beginning balance 10,780   10,663 10,662
Additions 54   18 1
Reclassification 328   99  
Ending balance 11,162   10,780 10,663
Accumulated depreciation, amortization and impairment [Member]        
Disclosure of detailed information about investment property [Line Items]        
Beginning balance (976)   (1,000) (1,041)
Depreciation expense (45)   (44) (42)
Impairment loss (336)   (9) (29)
Reclassification     (39)  
Reversal of impairment loss     107 83
Ending balance (1,357)   (976) (1,000)
Beginning balance, net 9,804   9,663  
Ending balance, net $ 9,805   $ 9,804 $ 9,663