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Contents of Significant Accounts - Summary of Terms and Conditions of Bonds (Detail) - TWD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about bonds [Line Items]    
Issued amount $ 38,359,352 $ 28,184,687
Domestic unsecured corporate bonds maturing in June 2024 [member]    
Disclosure of detailed information about bonds [Line Items]    
Term Ten-year  
Issuance date In mid-June 2014  
Issued amount $ 3,000,000  
Coupon rate 1.95%  
Repayment Interest will be paid annually and the principal will be repayable in June 2024 upon maturity.  
Domestic unsecured corporate bonds maturing in March 2022 [member]    
Disclosure of detailed information about bonds [Line Items]    
Term Five-year  
Issuance date In late March 2017  
Issued amount $ 6,200,000  
Coupon rate 1.15%  
Repayment Interest was paid annually and the principal was fully repaid in March 2022.  
Domestic unsecured corporate bonds maturing in March 2024 [member]    
Disclosure of detailed information about bonds [Line Items]    
Term Seven-year  
Issuance date In late March 2017  
Issued amount $ 2,100,000  
Coupon rate 1.43%  
Repayment Interest will be paid annually and the principal will be repayable in March 2024 upon maturity.  
Domestic unsecured corporate bonds maturing in October 2022 [member]    
Disclosure of detailed information about bonds [Line Items]    
Term Five-year  
Issuance date In early October 2017  
Issued amount $ 2,000,000  
Coupon rate 0.94%  
Repayment Interest was paid annually and the principal was fully repaid in October 2022.  
Domestic unsecured corporate bonds maturing in October 2024 [member]    
Disclosure of detailed information about bonds [Line Items]    
Term Seven-year  
Issuance date In early October 2017  
Issued amount $ 3,400,000  
Coupon rate 1.13%  
Repayment Interest will be paid annually and the principal will be repayable in October 2024 upon maturity.  
Domestic unsecured corporate bonds maturing in April 2026 [Member]    
Disclosure of detailed information about bonds [Line Items]    
Term Five-year  
Issuance date In late April 2021  
Issued amount $ 5,500,000  
Coupon rate 0.57%  
Repayment Interest will be paid annually and the principal will be repayable in April 2026 upon maturity.  
Domestic unsecured corporate bonds maturing in April 2028 [Member]    
Disclosure of detailed information about bonds [Line Items]    
Term Seven-year  
Issuance date In late April 2021  
Issued amount $ 2,000,000  
Coupon rate 0.63%  
Repayment Interest will be paid annually and the principal will be repayable in April 2028 upon maturity.  
Domestic unsecured corporate bonds maturing in April 2031 [Member]    
Disclosure of detailed information about bonds [Line Items]    
Term Ten-year (Green bond)  
Issuance date In late April 2021  
Issued amount $ 2,100,000  
Coupon rate 0.68%  
Repayment Interest will be paid annually and the principal will be repayable in April 2031 upon maturity.  
Domestic unsecured corporate bonds maturing in December 2026 [member]    
Disclosure of detailed information about bonds [Line Items]    
Term Five-year  
Issuance date In mid-December 2021  
Issued amount $ 5,000,000  
Coupon rate 0.63%  
Repayment Interest will be paid annually and the principal will be repayable in December 2026 upon maturity.  
Domestic Unsecured Corporate Bonds Maturing In September 2028 [Member]    
Disclosure of detailed information about bonds [Line Items]    
Term Five-year (Green bond)  
Issuance date In mid-September 2023  
Issued amount $ 10,000,000  
Coupon rate 1.62%  
Repayment Interest will be paid annually and the principal will be repayable in September 2028 upon maturity.