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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, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2016
TWD ($)
Dec. 31, 2018
USD ($)
Disclosure of transactions between related parties [Line Items]        
Revenues $ 438 $ 410 $ 348  
Operating Costs and Expenses 1,379 1,270 1,496  
Non-operating Income and Expenses 31 32 37  
Receivables 24 49   $ 1
Payables 918 684   $ 30
Acquisition of property, plant and equipment 312 390 320  
Prepaid rents - current 205 204    
Prepaid rents - noncurrent 1,346 1,551    
Prepaid rents 1,551 1,755    
Associates [Member]        
Disclosure of transactions between related parties [Line Items]        
Revenues 344 344 292  
Operating Costs and Expenses 1,304 1,197 1,405  
Non-operating Income and Expenses 31 32 37  
Receivables 11 43    
Payables 914 680    
Customers' deposits 6 6    
Acquisition of property, plant and equipment 312 390 313  
Joint ventures [Member]        
Disclosure of transactions between related parties [Line Items]        
Revenues 0 1 7  
Operating Costs and Expenses 0 2 17  
Acquisition of property, plant and equipment 0 0 7  
Others [Member]        
Disclosure of transactions between related parties [Line Items]        
Revenues 94 65 49  
Operating Costs and Expenses 75 71 $ 74  
Receivables 13 6    
Payables $ 4 $ 4