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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, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2020
USD ($)
Nov. 30, 2019
Feb. 28, 2019
Dec. 31, 2017
TWD ($)
Condensed Financial Statements Captions [Line Items]                
Assets $ 506,180   $ 477,128   $ 18,026      
Liabilities (118,907)   (92,856)   (4,235)      
Total equity 387,273   384,272 $ 384,529 13,791     $ 382,124
Investments accounted for using equity method 6,695   7,139   $ 238      
Revenues 207,609 $ 7,393 207,520 215,483        
Net loss for the period 34,704 1,236 33,921 38,581        
Total other comprehensive income (loss), net of income tax 1,290 46 1,328 (1,014)        
TOTAL COMPREHENSIVE INCOME 35,994 $ 1,282 35,249 $ 37,567        
Next Commercial Bank Co., Ltd. (“NCB”) [Member]                
Condensed Financial Statements Captions [Line Items]                
Assets 9,907   10,452          
Liabilities (789)   (728)          
Total equity $ 9,118   $ 9,724          
Percentage of ownership in associates 41.90%   41.90%   41.90% 41.90% 41.90%  
Equity attributable to the Company $ 3,820   $ 4,074          
Unrealized gain or loss from downstream transactions (43)              
Investments accounted for using equity method 3,777   4,074          
Net loss for the period (605)   (276)          
TOTAL COMPREHENSIVE INCOME $ (605)   $ (276)