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Net Income - Other Income and Expenses (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2022
TWD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2020
TWD ($)
Analysis of income and expense [abstract]        
Gain (loss) on disposal of property, plant and equipment $ 5 $ 0 $ 3 $ (1,428)
Impairment loss on right-of-use assets 0   (420) 0
Gain on disposal of investment properties, net 0 0 0 151
Reversal of impairment loss on investment properties 107 3 83 27
Loss on disposal of intangible assets 0 0 0 (2)
Impairment loss on intangible assets (9) 0 (29) (9)
Other income and expenses $ 93 $ 3 $ (369) $ 1,595