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Net Income - Other Income and Expenses (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]        
Gain (loss) on disposal of property, plant and equipment $ (3) $ 0 $ 1,428 $ (38)
Impairment loss on property, plant and equipment 0 0 0 (93)
Impairment loss on right-of-use assets (420)   0 0
Gain on disposal of investment properties, net 0 0 151 0
Reversal of impairment loss on investment properties 83 3 27 57
Loss on disposal of intangible assets 0 0 (2) 0
Impairment loss on intangible assets (29) (1) (9) (9)
Impairment loss on other assets 0 0 0 (44)
Other income and expenses $ (369) $ (13) $ 1,595 $ (127)