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Provisions - Movements in Provisions (Detail) - TWD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of other provisions [Line Items]      
Beginning balance $ 399 $ 427 $ 415
Additional/(reversal of) provisions recognized 440 58 84
Used / forfeited during the year (67) (86) (72)
Reclassification 50    
Effect of foreign exchange differences 0 0 0
Ending balance 822 399 427
Employee benefits [Member]      
Disclosure of other provisions [Line Items]      
Beginning balance 65 63 57
Additional/(reversal of) provisions recognized 323 2 7
Used / forfeited during the year (1) 0 (1)
Reclassification 0    
Effect of foreign exchange differences 0 0 0
Ending balance 387 65 63
Warranties [Member]      
Disclosure of other provisions [Line Items]      
Beginning balance 235 213 182
Additional/(reversal of) provisions recognized 69 108 102
Used / forfeited during the year (66) (86) (71)
Reclassification 0    
Effect of foreign exchange differences 0 0 0
Ending balance 238 235 213
Onerous Contracts [Member]      
Disclosure of other provisions [Line Items]      
Beginning balance 95 147 171
Additional/(reversal of) provisions recognized 49 (52) (24)
Used / forfeited during the year 0 0 0
Reclassification 50    
Effect of foreign exchange differences 0 0 0
Ending balance 194 95 147
Others [Member]      
Disclosure of other provisions [Line Items]      
Beginning balance 4 4 5
Additional/(reversal of) provisions recognized (1) 0 (1)
Used / forfeited during the year 0 0 0
Reclassification 0    
Effect of foreign exchange differences 0 0 0
Ending balance $ 3 $ 4 $ 4