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Net Income - Impairment Loss (Reversal of Impairment Loss) (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2023
TWD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2021
TWD ($)
Disclosure of impairment loss and reversal of impairment loss [abstract]        
Contract assets $ 2,000,000   $ 1,000,000 $ 0
Trade notes and accounts receivable 128,000,000   109,000,000 123,000,000
Other receivables 22,000,000   7,000,000 20,000,000
Inventories 23,000,000 $ 1 34,000,000 207,000,000
Property, plant and equipment 299,000,000   0 0
Right-of-use assets 0 0 0 420,000,000
Investment properties 336,000,000 10 (107,000,000) (83,000,000)
Intangible assets $ 0 $ 0 $ 9,000,000 $ 29,000,000