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Fair Value Information - Schedule of Impact of Decrease in Discount for Lack of Marketability or Noncontrolling Interests (Detail) - TWD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Fair Value Measurement Of Financial Instruments [Abstract]    
Discount for lack of marketability, 5% increase $ (49) $ (33)
Discount for lack of marketability, 5% decrease 45 33
Noncontrolling interests discount, 5% increase (22) (24)
Noncontrolling interests discount, 5% decrease 22 24
Long-term revenue growth rates, 0.1% increase 35 30
Long-term revenue growth rates, 0.1% decrease (35) (29)
Discount rate, 1% increase (396) (330)
Discount rate, 1% decrease $ 488 $ 407