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Net Income - Other Gains and Losses (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Analysis of income and expense [abstract]        
Valuation loss on financial assets and liabilities at fair value through profit or loss, net $ (147) $ (4) $ (98) $ (206)
Foreign currency exchange gain or loss, net (22)   (116) (185)
Gain (loss) on disposal of investments accounted for using equity method, net 85 3 6 (14)
Gain (loss) on disposal of financial instruments, net 1   0 1
Others (11)   (71) (14)
Other gains and losses $ (94) $ (3) $ (279) $ (418)