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Net Income - Other Income and Expenses (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]        
Loss on disposal of property, plant and equipment $ (17) $ (1) $ 0 $ (5)
Impairment loss on property, plant and equipment 0 0 (299) 0
Reversal of impairment loss / (impairment loss) on investment properties 139 4 (336) 107
Impairment loss 0 0 0 (9)
Other income and expenses $ 122 $ 3 $ (635) $ 93