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Net Income - Impairment Loss (Reversal of Impairment Loss) on Financial Instruments and Non-financial Assets (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Disclosure Of Impairment Loss And Reversal Of Impairment Loss [Abstract]        
Contract assets $ 0   $ 1,000,000 $ (2,000,000)
Trade notes and accounts receivable 123,000,000   49,000,000 (54,000,000)
Other receivables 20,000,000   (5,000,000) (69,000,000)
Inventories 207,000,000 $ 7 1,161,000,000 475,000,000
Property, plant and equipment 0   0 93,000,000
Right-of-use assets 420,000,000 15 0 0
Investment properties (83,000,000) (3) (27,000,000) (57,000,000)
Intangible assets 29,000,000 1 9,000,000 9,000,000
Other assets $ 0 $ 0 $ 0 $ 44,000,000