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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, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2023
USD ($)
Disclosure of transactions between related parties [Line Items]        
Revenues $ 460 $ 478 $ 554  
Operating Costs and Expenses 1,396 1,327 927  
Non-operating Income and Expenses 40 39 41  
Receivables 78 75   $ 3
Payables to related parties 385 539   $ 13
Customers' deposits 20 69    
Associates [Member]        
Disclosure of transactions between related parties [Line Items]        
Revenues 403 417 499  
Operating Costs and Expenses 1,322 1,247 853  
Non-operating Income and Expenses 38 37 38  
Receivables 76 70    
Payables to related parties 381 534    
Customers' deposits 20 69    
Acquisition of property, plant and equipment 173 32 398  
Acquisition of intangible assets 0 1 0  
Proceeds 0 0 10  
Gain on Disposal 0 0 2  
Others [Member]        
Disclosure of transactions between related parties [Line Items]        
Revenues 57 61 55  
Operating Costs and Expenses 74 80 74  
Non-operating Income and Expenses 2 2 $ 3  
Receivables 2 5    
Payables to related parties 4 5    
Customers' deposits $ 0 $ 0