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Equity - Unrealized Gain or Loss on Financial Assets at FVOCI (Detail) - TWD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Statement of changes in equity [abstract]      
Beginning balance $ (125) $ (8) $ 1,240
Unrealized gain or loss for the year      
Equity instruments 641 (111) (1,188)
Share of loss of associates and join ventures accounted for using equity method 5 (6) 0
Transferred accumulated gain or loss to unappropriated earnings resulting from the disposal of equity instruments (Note 9) 0 0 (60)
Ending balance $ 521 $ (125) $ (8)