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Net Income - Other Gains and Losses (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Analysis Of Income And Expense [Abstract]        
Valuation gain (loss) on financial assets and liabilities at fair value through profit or loss, net $ 243 $ 9 $ (99) $ (38)
Foreign currency exchange gain or loss, net 230   (47) 16
Gain on disposal of investments accounted for using equity method, net 4 0 10 151
Gain (loss) on disposal of financial instruments, net 0   (2) 4
Others (16)   (21) (49)
Other gains and losses $ 461 $ 17 $ (159) $ 84