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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, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2021
TWD ($)
Condensed Financial Statements Captions [Line Items]            
Assets $ 534,297   $ 523,741   $ 16,295  
Liabilities (138,491)   (131,022)   (4,224)  
Total equity 395,806   392,719 $ 391,529 12,071 $ 389,130
Investments accounted for using equity method 8,879   8,252   $ 271  
Net loss for the period 38,508 $ 1,174 38,061 37,869    
Other comprehensive income (loss) 2,081 64 669 1,112    
TOTAL COMPREHENSIVE INCOME 40,589 $ 1,238 38,730 $ 38,981    
Next Commercial Bank Co., Ltd. ("NCB") [Member]            
Condensed Financial Statements Captions [Line Items]            
Assets 48,637   37,431      
Liabilities (40,043)   (28,084)      
Total equity $ 8,594   $ 9,347      
Percentage of ownership in associates 46.26%   46.26% 41.90% 46.26%  
Equity attributable to the Company $ 3,975   $ 4,324      
Unrealized gain or loss from downstream transactions (24)   (31)      
Investments accounted for using equity method 3,951   4,293      
Net Revenues (losses) 314   10 $ (47)    
Net loss for the period (747)   (969) (1,004)    
Other comprehensive income (loss) (6)   14 (10)    
TOTAL COMPREHENSIVE INCOME $ (753)   $ (955) $ (1,014)