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Provisions - Movements in Provisions (Detail) - TWD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Jul. 01, 2020
Disclosure of other provisions [Line Items]        
Beginning balance $ 415 $ 304 $ 207  
Additional/(reversal of) provisions recognized 84 221 184  
Used / forfeited during the year (72) (125) (87)  
Acquired by business combinations (Note 14)       $ 15
Effect of foreign exchange differences 0      
Ending balance 427 415 304  
Warranties [Member]        
Disclosure of other provisions [Line Items]        
Beginning balance 182 173 132  
Additional/(reversal of) provisions recognized 102 131 127  
Used / forfeited during the year (71) (122) (86)  
Acquired by business combinations (Note 14)       0
Effect of foreign exchange differences 0      
Ending balance 213 182 173  
Onerous Contracts [Member]        
Disclosure of other provisions [Line Items]        
Beginning balance 171 67 19  
Additional/(reversal of) provisions recognized (24) 92 48  
Used / forfeited during the year 0 (3) 0  
Acquired by business combinations (Note 14)       15
Effect of foreign exchange differences 0      
Ending balance 147 171 67  
Employee benefits [Member]        
Disclosure of other provisions [Line Items]        
Beginning balance 57 59 51  
Additional/(reversal of) provisions recognized 7 (2) 9  
Used / forfeited during the year (1) 0 (1)  
Acquired by business combinations (Note 14)       0
Effect of foreign exchange differences 0      
Ending balance 63 57 59  
Others [Member]        
Disclosure of other provisions [Line Items]        
Beginning balance 5 5 5  
Additional/(reversal of) provisions recognized (1) 0 0  
Used / forfeited during the year 0 0 0  
Acquired by business combinations (Note 14)       $ 0
Effect of foreign exchange differences 0      
Ending balance $ 4 $ 5 $ 5