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Share-Based Payment Arrangements - Summary of Fair Value of Compensation Costs (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2023
TWD ($)
yr
Dec. 31, 2022
TWD ($)
yr
2021 Plan [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Stock price at measurement date | $ $ 593 $ 451
Risk-free interest rate 1.14% 1.09%
2022 Plan [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Stock price at measurement date | $ $ 593  
Risk-free interest rate 1.15%  
Bottom of range [member] | 2021 Plan [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Expected price volatility 24.76% 28.80%
Residual life 1 1
Bottom of range [member] | 2022 Plan [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Expected price volatility 24.76%  
Residual life 1  
Top of range [member] | 2021 Plan [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Expected price volatility 29.05% 32.19%
Residual life 2 3
Top of range [member] | 2022 Plan [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Expected price volatility 29.05%  
Residual life 3