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Investments Accounted for Using Equity Method - Summary of Financial Information of Investments in Associates (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2021
USD ($)
Nov. 30, 2019
Feb. 28, 2019
Dec. 31, 2018
TWD ($)
Condensed Financial Statements Captions [Line Items]                
Assets $ 512,875   $ 506,180   $ 18,489      
Liabilities (123,745)   (118,907)   (4,461)      
Total equity 389,130   387,273 $ 384,272 14,028     $ 384,458
Investments accounted for using equity method 7,137   6,695   $ 257      
Revenues 210,478 $ 7,588 207,609 207,520        
Net loss for the period 37,047 1,336 34,704 33,921        
Other comprehensive income (loss) (966) (35) 1,290 1,328        
TOTAL COMPREHENSIVE INCOME 36,081 $ 1,301 35,994 35,249        
Next Commercial Bank Co., Ltd. (“NCB”) [Member]                
Condensed Financial Statements Captions [Line Items]                
Assets 9,197   9,907          
Liabilities (525)   (789)          
Total equity $ 8,672   $ 9,118          
Percentage of ownership in associates 41.90%   41.90%   41.90% 41.90% 41.90%  
Equity attributable to the Company $ 3,634   $ 3,820          
Unrealized gain or loss from downstream transactions (42)   (43)          
Investments accounted for using equity method 3,592   3,777          
Net loss for the period (446)   (605) (276)        
TOTAL COMPREHENSIVE INCOME $ (446)   $ (605) $ (276)