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Related Parties Transactions - Details of Transactions Between the Company and Other Related Parties (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2024
USD ($)
Disclosure of transactions between related parties [Line Items]        
Revenues $ 467 $ 460 $ 478  
Operating Costs and Expenses 1,190 1,396 1,327  
Non-operating Income and Expenses 41 40 39  
Receivables 193 78   $ 6
Payables to related parties 480 385   $ 15
Customers' deposits 4 20    
Associates [Member]        
Disclosure of transactions between related parties [Line Items]        
Revenues 402 403 417  
Operating Costs and Expenses 1,108 1,322 1,247  
Non-operating Income and Expenses 40 38 37  
Receivables 184 76    
Payables to related parties 476 381    
Customers' deposits 4 20    
Acquisition of property, plant and equipment 144 173 32  
Acquisition of intangible assets 0 0 1  
Others [Member]        
Disclosure of transactions between related parties [Line Items]        
Revenues 65 57 61  
Operating Costs and Expenses 82 74 80  
Non-operating Income and Expenses 1 2 $ 2  
Receivables 9 2    
Payables to related parties 4 4    
Customers' deposits $ 0 $ 0