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Related Parties Transactions - Additional Information (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2021
SGD ($)
Disclosure of transactions between related parties [Line Items]        
Lease contract value $ 10,273 $ 9,597    
Interest on lease liabilities 69 80 $ 85  
ST-2 Satellite Ventures Pte., Ltd. ("STS") [Member]        
Disclosure of transactions between related parties [Line Items]        
Lease contract value 1,914 999    
Interest on lease liabilities $ 7 $ 9 $ 11  
ST-2 Satellite Ventures Pte., Ltd. ("STS") [Member]        
Disclosure of transactions between related parties [Line Items]        
Lease term 15 years      
Lease contract value $ 6,000     $ 261
Lease contract value, prepayment amount $ 3,068      
Extended useful life 3 years 3 months      
Right-of-use assets acquired $ 1,125