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Net Income - Other Income and Expenses (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
TWD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2021
TWD ($)
Analysis of income and expense [abstract]        
Gain (loss) on disposal of property, plant and equipment $ 0 $ 0 $ (5) $ (3)
Impairment loss on right-of-use assets 0   0 (420)
Impairment loss on property, plant and equipment (299) (10) 0 0
Gain on disposal of investment properties, net 0 0 1 0
Reversal of impairment loss (impairment loss) on investment properties (336) (10) 107 83
Impairment loss 0 0 (9) (29)
Other income and expenses $ (635) $ (20) $ 93 $ (369)