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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, 2021
TWD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2021
USD ($)
Disclosure of transactions between related parties [Line Items]        
Revenues $ 554 $ 1,574 $ 350  
Operating Costs and Expenses 927 783 1,040  
Non-operating Income and Expenses 41 40 45  
Receivables 41 230   $ 1
Payables to related parties 392 646   $ 14
Proceeds 10 386    
Gain on Disposal 2 310    
Associates [Member]        
Disclosure of transactions between related parties [Line Items]        
Revenues 499 1,508 274  
Operating Costs and Expenses 853 715 964  
Non-operating Income and Expenses 38 37 41  
Receivables 35 229    
Contract liabilities-current   183    
Payables to related parties 386 643    
Customers' deposits 16 5    
Acquisition of property, plant and equipment 398 375 242  
Proceeds 10      
Gain on Disposal 2      
Others [Member]        
Disclosure of transactions between related parties [Line Items]        
Revenues 55 66 76  
Operating Costs and Expenses 74 68 76  
Non-operating Income and Expenses 3 3 $ 4  
Receivables 6 1    
Payables to related parties $ 6 3    
Proceeds   386    
Gain on Disposal   $ 310