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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, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2020
USD ($)
Disclosure of transactions between related parties [Line Items]          
Revenues $ 1,574   $ 350 $ 438  
Operating Costs and Expenses 783   1,040 1,379  
Non-operating Income and Expenses 40   45 31  
Receivables 230   17   $ 8
Payables 646   654   $ 24
Acquisition of property, plant and equipment 375   242 312  
Proceeds from disposal of property, plant and equipment 319 $ 11 48 264  
Prepaid rents - current       205  
Prepaid rents - noncurrent       1,346  
Prepaid rents       1,551  
Associates [Member]          
Disclosure of transactions between related parties [Line Items]          
Revenues 1,508   274 344  
Operating Costs and Expenses 715   964 1,304  
Non-operating Income and Expenses 37   41 31  
Receivables 229   10    
Contract liabilities-current 183   0    
Payables 643   651    
Customers' deposits 5   8    
Acquisition of property, plant and equipment 375   242 312  
Others [Member]          
Disclosure of transactions between related parties [Line Items]          
Revenues 66   76 94  
Operating Costs and Expenses 68   76 75  
Non-operating Income and Expenses 3   4 $ 0  
Receivables 1   7    
Payables 3   3    
Proceeds from disposal of property, plant and equipment 386   $ 0    
Gain on Disposal $ 310